22G 
CORYPHODOX. 
The premaxillary bone is, like that of C. latklens, characterized by the 
steep descent of the ridge which continues the lateral border of the nares 
toward the alveolar margin, which it approaches much more closely than in 
C. radians and C. elepJiantoptis. Although the premaxillaries of the two indi¬ 
viduals of C. simus in possession of the expedition have lost their anterior 
apices, the principal portion remaining has such a similarity of form with 
that of the C. latklens^ of which the type-specimen includes a perfect speci¬ 
men, that there can be no doubt of their identity of character. The small 
diameter of the fractured base of the apex indicates that it had little extent, 
and that the muzzle was short at its most prominent portion, the upper lip. 
The premaxillary teeth preserved present no peculiarities. The superior 
canine accompanying the specimens is small and well worn. Its section is 
that of a subeqiiilateral spherical triangle, with the posterior line slightly 
concave. The posterior face of the crowm is quite concave in the longi¬ 
tudinal direction, and there is no accessory ridge along the externo-posterior 
angle. The superior premaxillary teeth do not present any peculiarities. 
The last and penultimate molars present the usual characters. The small 
external cone of the crown of the latter is quite distinct from the posterior 
external V, which is rather wide at the base, which has no cinguliim. 
The posterior molar is not produced backward into an angle, and the 
posterior crest is nearly parallel with the anterior. This tooth differs 
from the corresponding one of all the other species where I have seen 
it, in the absence of the ridge that descends from ■ the interior extremity 
of the anterior crest backward and downward to the basal cingulum. 
The corresponding ridge is well developed in the penultimate molar. 
Neither molars nor premolars have a basal cingulum on the inner 
extremity of the crown, nor any at the external base. The posterior 
cingulum of the last molar is small and not continued. The enamel of the 
superior canine and molars is nearl)^ smooth. 
The mandibular rami have a greater vertical diameter than most of the 
specimens that have come under my view, but a portion of it is plainly 
due to extension under pressure. The actual depth is, however, relatively 
greater at the posterior part than in otlicr specimens. The premolar teeth 
do not display any peculiarities, the first having, like the others, the short 
