108 



EODENTIA 



Subfamily 2. Geomyinae. 



Infraorbital foramen small. Cheek teeth without roots, with outer and inner folds 

 or sometimes with only one transverse fold. 



Entoptychus Cope (Fig. 134) and 



Pleurolicus Cope. Lower Miocene of 

 North America. 



Geomys Raf. Molars are simple 

 prisms. In the Miocene, Pleistocene 

 and Recent of North America. 



Thomomys Wied. Miocene, Plio- 

 cene, Pleistocene and Recent in 

 North America. 



Family 5. Anomaluroidea. 



\P. %M. Cheek teeth hrachyodont, 

 bunodont or lophodont. Infraorbital 

 foramen large. Tibia andfibida articu- 

 late freely.. The Recent subfamilies, 

 restricted to Africa, Anomaliirinae 

 and Fedetinae, are not known as 

 fossils. The fossil forms here 

 referred to the Anomaluroidea 

 possibly bear only an accidental similarity. 



Fig. 134. 



Entoptychus planifrons Cope, a, Skull and lower jaw, 

 i/i (after Cope); h, upper and c, lower tooth-row, ^/j. 

 Lower Miocene of John Day beds, Oregon. 



Subfamily 1. Pseudosciurinae. 



Cheek teeth bunodont. Cusps grouped in pairs. D smaller than P. 



Sciuroides F. Major. Pairs of cusps of the cheek teeth are joined to form 

 ridges. Upper ilf with insignificant cusps lying between these ridges. Eocene 

 and Oligocene. In the Bohnerz of Switzerland and Wiirtemberg, also in the 

 Phosphorites of Quercy. 



Pseuilosiyiurus suevicus Hensel. Oligocene (Bohnerz) of Eselsberg near Ulm. A, Skull. 

 £', Exterior aspect of mandible, i/j. C, Upper and D, lower tooth-row (enlarged). 



Pseiulosciurus Hensel (Fig. 135). Cusps isolated. Upper M with distinct 

 intermediate cusps. Bohnerz of Wiirtemberg, 



