. The Cambridge natural history. Zoology. CHAT. XIV SKELETON OF SEAL 447 where, however, it is the milk dentition that is most pronounced, the " permanent " being feeble and very early shed. But the dentition of the Pinnipedes pre- sents other likenesses to the Getacea, which are, it must be remembered, regarded by some as a modification of the Carni- vorous stock, in which case, of course, the like- nesses may be genetic rather than due to adaptation in the two cases. There is a dis- tinct tendency towards a homodont series, the grinding teeth being often very simple, and the very d
. The Cambridge natural history. Zoology. CHAT. XIV SKELETON OF SEAL 447 where, however, it is the milk dentition that is most pronounced, the " permanent " being feeble and very early shed. But the dentition of the Pinnipedes pre- sents other likenesses to the Getacea, which are, it must be remembered, regarded by some as a modification of the Carni- vorous stock, in which case, of course, the like- nesses may be genetic rather than due to adaptation in the two cases. There is a dis- tinct tendency towards a homodont series, the grinding teeth being often very simple, and the very distinct carnas- sial tooth of many terres- trial Carnivores being absent. Finally, the number of the back teeth shows some signs of being on the increase; and Professor Kilkenthal has found that this increase is due to the division of existing teeth. Here is a point of likeness to the many teeth of the typical Toothed Whales. Dr. Nehring found in several examples of Haliclioerus grypus the normal five back teeth increased to. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
Size: 925px × 2701px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
