. On the anatomy of vertebrates [electronic resource] . n reference to the sexes of insects, and thelike; and it is hoped that the time is now come when the ana-tomist may avail himself of this powerful instrument of thought,instruction, and discovery, from which the chemist, the astro-nomer, and the geometrician have obtained such importantresults. MOUTH OF MAMMALS. 383 CHAPTER XXX. ALIMENTARY CANAL AND APPENDAGES OF MAMMALS. § 223. Mouth.—Fleshy lips form the main characteristic of themammalian mouth. But they are wanting in the Monotremes,with other significant shortcomings of mammalian exc
. On the anatomy of vertebrates [electronic resource] . n reference to the sexes of insects, and thelike; and it is hoped that the time is now come when the ana-tomist may avail himself of this powerful instrument of thought,instruction, and discovery, from which the chemist, the astro-nomer, and the geometrician have obtained such importantresults. MOUTH OF MAMMALS. 383 CHAPTER XXX. ALIMENTARY CANAL AND APPENDAGES OF MAMMALS. § 223. Mouth.—Fleshy lips form the main characteristic of themammalian mouth. But they are wanting in the Monotremes,with other significant shortcomings of mammalian are, here, transitorily manifested, it is true, at the sucklingperiod; but sood degenerate into the pergameneous border ofthe beak in Platypus, and are reduced, in Echidna, to the scarcelymovable margin of the small terminal oral orifice of the Cetacea show the greatest extremes within the limits of anatural group in the development of the lips. They are barelyrepresented in the Porpoise, fig. 297, and other Delphinida by 297. Section of mouth and nose, Porpoise. the low, firm, ridge of integument, supported by adipo-fibroustissue with scarce a trace of 6 orbicularis oris: while in theWhale (Balcena) the upper lip falls down like a thick curtainsome feet in depth concealing the baleen, and overlapping the 384- ANATOMY OF VERTEBRATES.
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