240 . The American Naturalist. 
Length of premolar dentition 
Antero-posterior diameter of sectorial 
Length of diastema between canine and P. 1. 
Depth of ramus below P. 1. 
Depth of ramus just behind P. 4. 
[ODES 
APHELOPs, Cope. 
Cope has defined the genus Aphelops as follows.’ Denti- 
tion: I?¥, C4 P 45M ł; post-glenoid and post-tympani? 
process in contact but not coossified ; digits 3-3; nasals ges - 
less. To these characters Osborn! has added: “Magnum ney a 
supporting lunar anteriorly ; absence of the crista and e a 
able presence of the more or less strongly developed ‘erí an - 
and ‘anticrochet’ in the superior molars.” The project - 
referred to by Prof. Osborn as the anticrochetis, 1 think 
the crista, since it is produced quite as much or more from ©” > 
“Ball. V, U. S. G. S.. 1879-80. 
‘Bull. Mus. Comp. Zool. Harvard, p. 92. 
