186 



BULLETIISr 16 9, UNITED STATES NATIONAL MUSEUM 



although more reduced than in Claenodon: all the cheek teeth, ex- 

 cept p^, relatively wider; distance between p^ and the canine relatively 

 greater indicating a somewhat more elongate face ; infraorbital foramen 

 approaching nearer to the alveolar border above p^. 



"This species in size approximates C. protogonioides (Cope) but is 

 apparently clearly distinguishable from the Puerco species by the 

 much greater reduction and more oval contour of m^, and in the 

 relatively wider proportion of all the cheek teeth. 



"Measurements of A'', silberlingi 



c to m^ 60.0 mm, 



p3 to m* 34.5 mm. 



m* to m* 21.4 mm. 



ml length 7.0 mm. 



m' width - 8.8 mm. 



m^ length - 7.4 mm. 



m^ width 11.5 mm. 



m^ length 5.0 mm. 



m^ width. 9.0 mm. 



Distance between p^ and p^ 5.0 mm. 



Height of p' (outside) ._ 5.5 mm. 



Length of canine alveolus — 7.5 mm." 



Figure 40,- 



-Claenodon silberlingi (Qidley), U.S.N. M. no. 8363, left upper jaw: a. Crown view; 6, external 

 view. Natural size. (After Qidley, 1919, fig. 9.) 



Discussion. — Allusion to "C. proiogonioides" implies comparison 

 rather with the unnamed Torre j on species of Claenodon than with 

 the different Puerco species to which the name properly appUes. 



The type of this species is so poor, the cusp structure being very 

 much obscured and in part destroyed by corrosion and breakage, that 

 it cannot surely be distinguished from the small Torrejon species, on 

 one hand, or from C. montanensis, on the other, although these two 

 are distinct from each other. 



