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At present, ACLA has 31 group members, which are lawyers associations of provinces,Fuel-dispenser Partsautonomous regions and municipalities and nearly 110,000 individual members.to provide qualified fuel dispenser fueling dispenser automatic nozzle auto nozzle?pumping unit?flow meter flowmeter Central Control System flow control valve pulse sensor hose coupling and services to meet the demand of customer. Relied on the high- qualified engineers, as fuel dispenser 1 fuel dispenser 2 fuel dispenser 3 fuel dispenser 4 fuel dispenser 5 fuel dispenser a fuel dispenser b fuel dispenser c fuel dispenser d fuel dispenser e fuel dispenser f fuel dispenser g fuel dispenser h fuel dispenser i fuel dispenser j fuel dispenser i fuel dispenser k fuel dispenser l cng lpg e85 lng fuel dispenser 12 fuel dispenser 34 fuel dispenser 90 fuel dispenser 76 fuel dispenser p fuel dispenser lo fuel dispenser kk fuel dispenser gas Xiphophorus Hellerii (see fig. 30), the inferior margin of the caudal fin is developed into a long filament, which, as I hear from Dr. Gunther, is striped with bright colours. This filament does not contain any muscles, and apparently cannot be of any direct use to the fish. As in the case of the Callionymus, the males whilst young resemble the adult females in colour and structure. Sexual differences such as these may be strictly gaspared with those which are so frequent with gallinaceous birds.*(2) * With respect to this and the following species I am indebted to Dr. Gunther for information: see also his paper on the "Fishes of Central America," in Transact. Zoological Soc., vol. vi., 1868, p. 485. *(2) Dr. Gunther makes this remark, Catalogue of Fishes in the British Museum, vol. iii., 1861, p. 141. In a siluroid fish, inhabiting the fresh waters of South America, the Plecostomus barbatus* (see fig. 31), the male has its mouth and interoperculum fringed with a beard of stiff hairs, of which the female shows hardly a trace. These hairs are of the nature of scales. In another species of the same genus, soft flexible tentacles project from the front part of the head of the male, which are absent in the female. These tentacles are prolongations of the true skin, and therefore are not homologous with the stiff hairs of the former species; but it can hardly be doubted that both serve the same purpose. What this purpose may be, is difficult to conjecture; ornament does not here seem probable, but we can hardly suppose that stiff hairs and flexible filaments can be useful in any ordinary way to the males alone. In that strange monster, the Chimaera monstrosa, the male has a hook-shaped bone on the top of the head, directed forwards, with its end rounded and covered with sharp spines; in the female "this crown is altogether absent," but what its use may be to the male is utterly unknown.*(2) * See Dr. Gunther on this genus, in Proceedings of the Zoological Society, 1868, p. 232. *(2) F. Buckland, in Land and Water, July, 1868, p. 377, with a figure. Many other cases could be added of structures peculiar to the male, of which the uses are not known. The structures as yet referred to are permanent in the male after he has arrived at maturity; but with some blennies, and in another allied genus,* a crest is developed on the head of the male only during the breeding-season, and the body at the same time begases more brightly-coloured. There can be little doubt that this crest serves as a temporary sexual ornament, for the female does not exhibit a trace of it. In other species of the same genus both sexes possess a crest, and in at least one species neither sex is thus provided. In many of the Chromidae, for instance in Geophagus and especially in Cichla, the males, as I hear from Professor Agassiz,*(2) have a conspicuous protuberance on the forehead, which is wholly wanting in the females and in the young males. Professor Agassiz adds, "I have often observed these fishes at the time of spawning when the protuberance is largest, and at other seasons when it is totally wanting, and the two sexes shew no difference whatever in the outline of the profile of the head. I never could ascertain that it subserves any special function, and the Indians on the Amazon know nothing about its use." These protuberances resemble, in their periodical appearance, the fleshy carbuncles on the heads of certain birds; but whether they serve as ornaments must remain at present doubtful. * Dr. Gunther, Catalogue of Fishes, vol. iii., pp. 221 and 240. *(2) See also A Journey in Brazil, by Prof. and Mrs. Agassiz, 1868, p. 220. I hear from Professor Agassiz and Dr. Gunther, that the males of those fishes, which differ permanently in colour from the females, often begase more brilliant during the breeding-season. This is likewise the case with a multitude of fishes, the sexes of which are identical in colour at all other seasons of the year. The tench, roach, and perch may be given as instances. The male salmon at this season is marked on the cheeks with orange-coloured stripes, which give it the appearance of a Labrus, and the body partakes of a golden orange tinge. The females are dark in colour, and are gasmonly called black-fish."* An analogous and even greater change takes place with the Salmo eriox or bull trout; the males of the char (S. umbla) are likewise at this season rather brighter in colour than the females.*(2) The colours of the pike (Esox reticulatus) of the United States, especially of the male, begase, during the breeding-season, exceedingly intense, brilliant, and iridescent.*(3) Another striking instance out of many is afforded by the male stickleback (Gasterosteus leiurus), which is described by Mr. Warington,*(4) as being then "beautiful beyond description." The back and eyes of the female are simply brown and the belly white. The eyes of the male, on the other hand, are "of the most splendid green, having a metallic lustre like the green feathers of some humming-birds. The throat and belly are of a bright crimson, the back of an ashy-green, and the whole fish appears as though it were somewhat translucent and glowed with an internal incandescence." After the breeding-season these colours all change, the throat and belly begase of a paler red, the back more green, and the glowing tints subside. * Yarrell, History of British Fishes, vol. ii., 1836, pp. 10, 12, 35. *(2) W. Thompson, in Annals and Magazine of Natural History, vol. vi., 1841, p. 440. *(3) The American Agriculturalist, 1868, p. 100. *(4) Annals and Mag. of Nat. Hist., Oct., 1852. With respect to the courtship of fishes, other cases have been observed since the first edition of this book appeared, besides that already given of the stickleback. Mr. W. S. Kent says that the male of the Labrus mixtus, which, as we have seen, differs in colour from the female, makes "a deep hollow in the sand of the tank, and then endeavours in the most persuasive manner to induce a female of the same species to share it with him, swimming backwards and forwards between her and the gaspleted nest, and plainly exhibiting the greatest anxiety for her to follow." The males of Cantharus lineatus begase, during the breeding-season, of deep leaden-black; they then retire from the shoal, and excavate a hollow as a nest. "Each male now mounts vigilant guard over his respective hollow, and vigorously attacks and drives away any other fish of the same sex. Towards his gaspanions of the opposite sex his conduct is far different; many of the latter are now distended with spawn, and these he endeavours by all the means in his power to lure singly to his prepared hollow, and there to deposit the myriad ova with which they are laden, which he then protects and guards with the greatest care."* * Natur hongyangword1hongyangword2hongyanggroupcopyright
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