o 



10 PROCEEDINGS OF THE ACADEMY OF [1892. 



skull we observe the loug, narrow cranium, which has but small 

 cerebral capacity, with very marked post orbital constriction, prom- 

 inent sagittal and occipital crests and long zygomatic arches. The 

 roof of the cranium and that of the face lie in nearly the same plane ; 

 the face is short and tapering ; the anterior nares are terminal in 

 position and overhung by the tips of the nasals, which project beyond 

 the premaxillaries. The mandible is long and slender, with very broad 

 ascending ramus and high, recurved and blunt coronoid process; 

 the masseteric fossa is very large and deep and the angular process 

 long and prominent. 



The neck is of moderate length, the lumbar vertebrae stout, with 

 well developed anapophy^;es, and the tail long. The astragalus is 

 nearly flat in some species, moderately grooved in others; it has a 

 long neck, with rounded, narrow head, which displays a small facet 

 for the cuboid. The calcaneura has a long and slender tuber ealcis 

 and a small sustentaculum, and above the distal end is considerably 

 expanded, as in the plantigrade carnivores. The cuboid is very high 

 and narrow : the calcaneal facet is transverse and the astragalar nar- 

 row and oblique. The carpus is low and the scaphoid and lunar 

 separate. 



Sliiopa is very abundantly represented in the Wasatch and 

 Bridger, not less than thirteen species having been described, rang- 

 ing in size from a weasel to a fox. S. rapax Leidy, S. (Limnocyon) 

 verus Marsh and S. (Limnocyo7i) agilis Marsh, S. (Sfypolophus) jnm- 

 gens Cope, S. {Stypolophus) inseetivorus Cope, S. {Sfypolophus) 

 brevlcalearatus Cope and S. {Trlacodon, Sfypolophus) aculeatus Cope, 

 are from the Bridger ; S. (Prototomus, Stypolop)hus) viverrinus Cope, 

 S. {Prototomus, Sfypolophus) secundarius Cope, S. (Prototonms, 

 Sfypolophus) nndtkmspis Cope, S. (Prototomus, Sfypolophus) sfren- 

 uus Cope and S. {Sfypolophus) hlans Cope, are from the Wasatch, 

 while S. ivhitice Cope {Stypoloph^is sfrenuus Cope, in part, Sfypolo- 

 phus whifice Cope), has been found in the Wasatch and Wind River 

 beds. Sinopa exlmia^ Leidy probably does not belong to this genus 

 and Schlosser has referred it to the Primates. Lhnnocyon riparms' 

 Marsh likewise must be removed from the genus, as in it m^ and ^ 

 are described as being tubercular. 



' Cont. to Ext. Vert, Fauna of Western Territories p. 118. 

 ^ Am. Journ. of Sci. and Arts, 3rd Ser., Vol. IV, p. 203. 



