A treatise on zoology . -leus), lies on the anteriorwall of the air-bladder ;the foremost and smallest,the claustrum, on themembranous wall of theatrium; the scaphiuni(stapes), with a processfitting over the atrialfenestra, and the inter-calarium (incus) completethe chain (Fig. 359).Observers differ as tothe exact homology ofWebers ossicles. Thetripus is believed torepresent the rib of thethird vertebra (Sage-mehl) ; the intercalariumthe neural arch of thesecond vertebra (Wright);the scaphium the neuralarch, and the claustrum the spine of the first ^•ertebra (Wright). Sagemehl and Grassiconsid
A treatise on zoology . -leus), lies on the anteriorwall of the air-bladder ;the foremost and smallest,the claustrum, on themembranous wall of theatrium; the scaphiuni(stapes), with a processfitting over the atrialfenestra, and the inter-calarium (incus) completethe chain (Fig. 359).Observers differ as tothe exact homology ofWebers ossicles. Thetripus is believed torepresent the rib of thethird vertebra (Sage-mehl) ; the intercalariumthe neural arch of thesecond vertebra (Wright);the scaphium the neuralarch, and the claustrum the spine of the first ^•ertebra (Wright). Sagemehl and Grassiconsider that the claustrum is derived from the skull. Moreprobably the two last ossicles represent the first neural arch andrib. The anterior vertebrae are much modified in connection withWebers apparatus. The air-bladder often comes (piite close to the skin, justbehind the pectoral girdle, forming a sort of tympanum, in manyCyprinidae, Characinidae, and Siluridae. All adipose fin is found in all the families excepting the. vc. Fio. 359. Macrones nemwus. A, the Weberian ossicles. B, por-tion of the skull, the labyrinth, and Weberian apparatusdiagraniniatically represented from above (from thefigures of Bridge and Haddon). , air-bladder ; vertical canal of the car; el, claustrum ; ; /i, horizontal canal; hi, intercalarium; ; s, .sacculus ; sc, scaphiuni; tr, tripus ; ut, utri-eulus ; , verteljral column. 374 TELEOSTEI Cyprinidae. Often there are spinous serrated anterior dermal rayson the median and paired fins; such spines are formed hy theenlargement and ankylosis of the segments of the lepidotrichiafrom the base outwards, unfused segments frequently remaining atthe tip. In the pectoral girdle, besides the mesocoracoid arch, mustbe noticed the great development of the coracoids, which often meetin a ventral suture (Fig. 365). The Cypriniformes have divergedin two chief branches: the Characinidae depart least from theprimitive type,
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
