128 ■ DINOCERATA. 



The proximal phalanges (Plata XXXVIII, figures 1 and 2) are much 

 the larg-est. The proxhiial surface has no central groove, and is adapted 

 to the comparatively smooth face on the distal end of the metacarpals. 



Tlie median phalanges (figures 3 and 4) are much shorter than those 

 described above. Their proximal articular faces are nearly flat, and the 

 distal ones, smaller, and more concave transversely. 



The ungual phalanges (figures 5 and 6) are larger than those of the 

 median series, and, with the exception of the small articular face, their 

 surfaces are very rugose. 



