78 MEMOIRS OF THE CARNEGIE MUSEUM 
are, however, relatively small, P* especially so, and the whole series is more spaced, 
while in the latter genus the sécond premolar forms a closed continuous series with 
the posterior teeth, and P+ only is widely separated by a diastema. In Dinohyus 
P* and P* are widely separated and P2 and P% are separated only by a very short 
diastema. Back of P* the dentition forms a continuous closed series. 
P+ is of relatively large size with a simple crown, the apex of which is placed 
well forward the cingulum is quite heavy on the antero-internal angle and the 
Fia. 30. Upper Right Canine of Type of Dinohyus hollandi Peterson. } nat. size. (Carn. Mus. Cat. Vert. Foss., No. 
1594. ) 
heel slopes rapidly behind. P*is of about the same size and shape as P41, except that 
the antero-internal cingulum is slightly more developed and extends further toward 
the external face of the tooth. The enamel of this tooth is less crinkled than that 
of P+. P# has a relatively smaller antero-posterior and a greater transverse diam- 
eter than in the Oligocene forms. This transverse enlargement of the tooth 
