. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. MAMMALS. 407 The teeth in existing species are homodont and monophyo- dont, and never pierce the gums in the mystacocetes. In the fossils there is evidence of descent from heterodont Fig. 374. Skull of foetal cachelot whale {Physeter), from Huxley. AS, alisphenoid; ^«, auditory region; j90, basioccipital; ^.J, basisphenoid; ^O, exoc- cipital; ^/,4, ethmoid; /^?-, frontal; /«, jugal (displaced in the side view from its connection with the squamosal) ; jKt, maxillary; TV, external nares; 7°a, parietal; PI, palatine
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. MAMMALS. 407 The teeth in existing species are homodont and monophyo- dont, and never pierce the gums in the mystacocetes. In the fossils there is evidence of descent from heterodont Fig. 374. Skull of foetal cachelot whale {Physeter), from Huxley. AS, alisphenoid; ^«, auditory region; j90, basioccipital; ^.J, basisphenoid; ^O, exoc- cipital; ^/,4, ethmoid; /^?-, frontal; /«, jugal (displaced in the side view from its connection with the squamosal) ; jKt, maxillary; TV, external nares; 7°a, parietal; PI, palatine; Pmx, premaxillary; SO, supraoccipital; Sq, squamosal; Vo, vomer. The number varies greatly. The stomach (p. 367) is several chambered, the intestine is comparatively simple, a caecum being present in some species. The liver has four lobes, and no gall. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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