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Show 1891.] TADPOLES OF THE EUROPEAN BATRACHIANS. 595 Discoglossidce, however, each ridge, or at any rate the second, bears two or even three rows of teeth (fig. 1, B). The history of the accessions to our knowledge of the structure of the beak and lips has been given very fully by Heron Royer and Van Bambeke. In addition to the works of Schulze, Keiffer, and B Open mouth of, A, Pelodytes punctatus, B, Alytes obstetricans. b.o, buccal orifice ; l.p, labial papillae ; m, mandibles; t, series of labial teeth. Gutzeit, mentioned above, I would refer the reader particularly to the following papers : - . C. V A N B A M B E K E . " Reeherches sur la structure de la bouche chez les tetards des Batraciens anoures." Bull. Ac. Belg. (2) xvi. 1863, p. 339, pis. i., ii. F. E. S C H U L Z E . "Ueber Cuticulare Bildungen und Verhornung von Epithelzellen bei den Wirbelthieren." Arch. f. mikr. Anat. v. 1869, p. 295, pi. xvii. H E R O N R O Y E R and C. V A N B A M B E K E . " Sur les Caracteres |