The biology of the amphibia (1931) (20194218088)

Title: The biology of the amphibia
Identifier: biologyofamphibi00nobl (find matches)
Year: 1931 (1930s)
Authors: Noble, Gladwyn Kingsley, 1894-1940
Subjects: Amphibians
Publisher: New York : McGraw-Hill
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: York University - University of Toronto Libraries



Text Appearing Before Image:
THE MODE OF LIFE HISTORY 65 were described as respiratory structures but histological examina- tion has shown that they are merely folds of the body wall pro- duced by the rapid absorption of the yolk. This, apparently, is a very trivial feature in the organization of these young frogs; nevertheless, it occurs only in these closely related species.
Text Appearing After Image:
A Fig. 23.—Suctorial disc of a mountain-brook tadpole. A. Tadpole of Staurois ricketti as seen from the ventral surface. B. The disc dissected free and viewed from its dorsal aspect. Br.Sac, branchial sac; Cent.Prom., central prominence; Fr.Ar., friction area; Fr.Rm., free rim; Jr., infrarostrale; Md., mandibulare; M.D.M., M. diaphragmatobranchialis medialis; M.D.Prec, M. diaphragmato- prfficordialis; M.R.A., M. rectus abdominis; M.Sub.Br., M. subbranchialis; Pericard., ligamentous posterior wall of pericardium, cut edge; Pois.GL, poison gland; S.Hy.Lig., subhyoid ligament; S.Mx.Lig., submaxillary ligament; Spir., spiracle; S.Qu.Lig., subquadrate ligament; Sr., suprarostrale; Sub.Br.Prom., subbranchial prominence; Sub.Hy.Fol., fold over M. subhyoideus; Sub.Hy.Prom., subhyoid prominence; Sub.Mx.Prom., submaxillary prominence. The tadpoles of the numerous species of Rana exhibit few modifications. Those which live in swift waters resemble the mountain-brook larvae of salamanders in lacking body fins and in having the tail fins greatly reduced (Fig. 22A). Unlike salamanders their lips are frequently enlarged and assist them in adhering to rocks (Fig. 23). In many of these species the number of tooth rows is correspondingly increased. Some of the Indian species of Rana, while enlarging their lips, tend to lose their tooth