. Comparative dental anatomy. Teeth; Dentistry. THE TEETH OF MAMMALS 125 but absent on the other, so that wear produces a sharp edge. Dense, horny plates are placed far- ther back on the jaw, under which rudimentary teeth are found, and beyond these are molars of dentin and cementum. The Manatee has thirty- six teeth, with square crowns with transverse ridges. The upper molars have three roots and the lower two. There is a deciduous premaxillary tusk in the Manatee, but no incisor teeth in the. Fig. 40.—Teeth of Dugong. adult, and horny plates are supplied instead. Stellar's Eytina was a sea-c
. Comparative dental anatomy. Teeth; Dentistry. THE TEETH OF MAMMALS 125 but absent on the other, so that wear produces a sharp edge. Dense, horny plates are placed far- ther back on the jaw, under which rudimentary teeth are found, and beyond these are molars of dentin and cementum. The Manatee has thirty- six teeth, with square crowns with transverse ridges. The upper molars have three roots and the lower two. There is a deciduous premaxillary tusk in the Manatee, but no incisor teeth in the. Fig. 40.—Teeth of Dugong. adult, and horny plates are supplied instead. Stellar's Eytina was a sea-cow that has become ex- tinct within historic times. The last of the species inhabited Behring's Island. The dentition con- sisted mainly of horny plates which were used in cutting soft sea-weed. Some extinct forms of this family are found which suggest relationship with the tapirs, and it is probable that the ancestors of the Sirenia were connected with the land her- 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 Thompson, Alton Howard, 1849-1914; Dewey, Martin, 1881-. St. Louis, C. V. Mosby
Size: 1993px × 1254px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherstlou, bookyear1915
