428 



Bulletin American Museum of Natural History. [Vol. XXVII, 



Remarks. 



Lemuroidea. 



Anthropoidea. 



Rodentia. 



Hi/strix. 

 Carnivora. 

 -i^luroiclea. 

 Cunidce. 



Remaining 

 Fissipeds. 



Pinnipedia. 



Hyracoidea. 

 Proboscidea. 

 Perissodactyla. 



Equus 



Rhinoceros. 



Tapiriis 

 Artiodactyla. 



Tylopoda, 

 Pecora. 



Suina. 

 Tubulidentata. 



Xenarthra. 



(except Sloths.) 

 Sloths. 



Cetacea. 



Baloenoptera. 



Closely resembles Insect ivore type. In corre- 

 lation with reduced rhinencephalon: olfactory 

 scrolls simple, cribriform plate narrow, with few- 

 perforations. 



Progressive reduction of turbinals and rhinen- 

 cephalon (microsmatism). 

 Closely similar to Insectivora (Paulli). 



Primitively very similar to Insectivora (Paulli). 

 Epirni/cferi Cope (^Eluroidea plus primitive 

 Arctoidea): maxilloturbinal doubly wound, not 

 excluding nasoturbinal and second olfactory 

 scroll from anterior nares. Hypomycteri Cope 

 (e. g., Ursidfe, Mustelidae): aiaxilloturbinal 

 branched and very large, excluding nasoturbinal 

 etc. from anterior nares. 



Hypomycterous condition carried to an extreme 

 (p. 314) (Aquatic adaptation for warming 

 in-spired air). 

 Closely similar to Insectivora (Paulli). 



Macrosmatic. Ectoturbinals highly developed 

 Perissodactyla and Artiodactyla. Ungulata in 

 parallel Edentata in secondary increase of 

 number in turbinals. 



Highest number among mammals (extreme 



macrosmatism). 



Nasoturbinal very large, as in Orycteropus. 



In Cholapus mesethmoid well ossified and end- 

 ing abruptly, much as in Marsupialia. 



Extreme reduction, anosmatism. 



