. A manual of zoology. Zoology. 572 CHORDATA evidence would seem to point to tlic ungulates, creodonts, or carnivores. The toothed and whalebone whales may ha\e had different ancestries, their resem- blances being the result of convergence. Sub Order I. ZEUGLODONTA. Extinct (eocene) forms with hcterodont dentition, the posterior teeth two-rooted. Sub Order II. DENTICET,E, toothed whales, carnivorous, some having but two teeth. Dclphinus* dolphins; Clohiocephalns* black fish; Monodon, narwal, male with a long maxillary tusk. Physcter macroccphahis, sperm whale, pursued for the spermaceti, an oi
. A manual of zoology. Zoology. 572 CHORDATA evidence would seem to point to tlic ungulates, creodonts, or carnivores. The toothed and whalebone whales may ha\e had different ancestries, their resem- blances being the result of convergence. Sub Order I. ZEUGLODONTA. Extinct (eocene) forms with hcterodont dentition, the posterior teeth two-rooted. Sub Order II. DENTICET,E, toothed whales, carnivorous, some having but two teeth. Dclphinus* dolphins; Clohiocephalns* black fish; Monodon, narwal, male with a long maxillary tusk. Physcter macroccphahis, sperm whale, pursued for the spermaceti, an oily mass situated in the 'chair' between the cranium and the snout, as well as for amber- gris, formed in the intestines. Sub Order III. ]\IYST.^CP>TI, whalebone whales, with baleen. Balcrnoptcra* rorquals and fin backs. B. sihbaldi* the largest whale, eighty-live feet long. Bahcna, right whale. Order XI. Prosimiae (Lemuroida). Linne united with the true apes a small group of animals known as lemurs, because of similarity in body form and climbing habits, liecause they had grasping hands and feet (opposable thumb and great toe), and frequently nails on some of the toes. To-day many set them aside as a separate order on account of their lower organization. They have a less-developed cerebrum, uterus bicornis, and a diffuse olacenta. Further peculiarities are the peculiar and. Fig. 62o.^Stenops gracilis, slender loris (from Brehm). variable dentition (Chiromys MH, Lemur l\l^. Nocturnal habits have re- sulted in large eyes, which give these animals a most striking appearance. A distinction from the primates is the connexion of orbital and" temporal ca\ ities beneath the postorbital ring. Usually there are a pair of pectoral mamma!;, to which are added in many species a pair in the abdominal or inguinal region, the latter alone occurring in Cliiromys. All come from the Indian and Malagassy regions. Chiromyid,*:, digits long, all except the great toe with claws; Chir
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
