SCIUROMORPHA- 843 



u. 



Width between anterior parts of orbits 027& 



Widtb at base nf muzzle 01& 



Length from occipital condyle to front of otic bulla, inclusive 018 



Length from bulla to last molar tooth 00& 



Length from first molar to base of incisor O-iS 



Length of superior molar series 0195 



Diameters of first molar 5 '"'^"°P°^^"'°'" -' " Z^a^ 



( transverse W4o 



Diameters of fourth molar) ''"''■^"P''«t^"'"- " ^^ 



( transverse WJa 



Measurements of mandible. 



Length from condyle to incisor tooth 039O 



Length from incisor to Pm. iv - - 0105 



Length of inferior molar series 0145 



Diameters of Pm.iv^''°«»^'-''P*'«'"'°'- Z*^. 



< transverse uu4ir 



Diameters of M.i^''"^"''!'"^"^"'"' ZJL 



< transverse wnv 



Diametersof M. ii^''°t"»P''«t*^"'"^ ^^ 



< transverse • uuda 



Depth of ramus at diastema OlOO 



Depth of ramus at Pm. iv 0130 



Depth of ramus at M. iii OlOO 



A few bones accompany the mandible, all having been cut from the 

 same fragment of matrix. The head of the femur is perfectly round, and 

 is bounded by a well-defined neck. The great trochanter incloses a large 

 fossa. The lesser trochanter is large; the third trochanter is not prominent 

 as it is in C. viciacensis. The shaft is generally flattened, with its long 

 diameter transverse. The condylar extremity is flattened, and the rotular 

 groove is wide, and the condyles well separated. The epicondylar angles 

 are distinct, but not so prominent as in S. viciacensis (see Filhol, I. c, PI. VI, 

 Figs. 1 3, 1 4). The general form of the femur is robust, as in that species. 



The distal extremity of the tibia resembles that of Sciuridce generally, 

 especially in the large size of the external postei-ior angle. Its diameters 

 are small, and the distal part of the shaft is slender and subcylindrical. 

 The crest extends well down from the proximal end, being much stronger 

 than in the true squirrels, and bounds a longitudinal fossa. The fibular 

 facet of the tibia overhangs extensively, and bounds a rather narrow proxi- 

 mal fossa. This continues into a narrow shallow groove on the posterior 

 face of the shaft, which disappears near the middle of its length. The 

 proximal half of the shaft is much compressed. The inner face is smooth 



