40 



INSECTIVORA 



Micropfernodus Matthew (Fig. 61). 



3.1.3.3 



and small talonid as in the case of Centefes. 



2.1.3.3 



M composed of high trigonid 



Apternodus Matthew. 



Talonid very much reduced. P^ in both 



2.1.3.3. 



jaws M-like. Skull like that of Ericulus but distinguishable by the 

 strongly-developed mastoid. 



Suborder B. DILAMBDODONTA Gill. 



Upper M tritubercular, often tvith hypocone. Lower M tubercido-sedorial, with 

 well-developed talonid. Symphysis pubis small or wanting. 



2-3.1.4.3. 



Family 1. Leptictidae Cope. 

 Upper M very broad, triangular and tritubercular, usually with 

 Outer tubercles conical. I p)ointed, not tinlike C. P^ in both jaws 



2.1.4.3. 



weak hypocone. 



M-like. Skull usually with two temporal crests, slender zygomatic arch and a pointed 



and fairly long snout. Humerus with entepicondylar foramen. 



Diaeodon Cope. Palaeictops Matthew. Lower Eocene (Wasatch beds) of 

 North America. A single sagittal crest on skull. Phenacops Matthew. Middle 

 Eocene (Bridger). 



Fig. 0-. 

 Leptictis Itaydeni lisidy. Oligoceue of Dakota. Upper, lateral, and lower aspect of skull. 1/]. (After Leidy.) 



Leptictis, Ictops Leidy (Fig. 62). Skull with two temporal crests. 

 Oligocene (White Eiver beds) ; North America. 



3-2.1.4-3.3. 



Family 2. Talpidae. Moles. 

 Upper M tritubercular, outer tuhercles V-shaped. Snout very 



much elongated, zygoma slender. Bullae osseae rounded. Fore -limb developed 

 as broad, sJwvel-like implement. Tibia and fibula distally joined. Pelvis very long. 

 Short tail. 



