572 



CHORD ATA 



evidence would scorn to point to the ungulates, creodonts, or carnivores. The 

 toothed and whalebone whales may have had different ancestries, their resem- 

 l/hinces being the result of convergence. 



Sub Order I. ZEUGLODONTA. Extinct (eocene) forms with heterodont 

 dentition, the posterior teeth two-rooted. Sub Order II. DENTICET/E, 

 toothed whales, carnivorous, some having but two teeth. Delphinus* dolphins; 

 Globiocephalus,* black fish; Mwwdoii, narwal, male with a long maxillary tusk. 

 Physctcr macrocephalus, 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. MYSTACETI, whalebone 

 whales, with baleen. Baltznoptera* rorquals and fin backs. B. sibbaldi* the 

 largest whale, eighty-five feet long. Balccna, 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, because 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 placenta. Further peculiarities are the peculiar and 



FIG. 62o.Stenops gracilis, slender loris (from Brehm). 



variable dentition (Chiromys (-g-Jf, Lemur Sj^). Nocturnal habits have re- 

 eyes, which give these animals a most striking appearance. A 

 trom the primates is the connexion of orbital and temporal cavities 

 J osseous postorbital ring. Usually there are a pair of pectoral 

 ae to which are added in many species a pair in the abdominal or inguinal 

 on, the latter alone occurring in Cliiromvs. All come from the Indian and 

 -Malagassy regions. 



CniKmiYin ,!:, digits long, all except the great toe with claws; Chiromys, 



lARSinxE, second and third hind toes clawed. Tarsius, East Indies, 



closed orbits and discoidal placenta. LEMURID/E, second hind toe 



