1892.) - Geology and Paleontology. 761 
The enamel is coarsely wrinkled when not worn by use. The roots 
are encased in a layer of cementum, which forms a narrow ledge 
round the base of the crown. The true molar preserved has a 
transverse triangular crown. The paracone is conical and the meta- 
cone is compressed so that its worn section is anteroposterior. A 
longitudinal ridge notched in the middle occupies the space between 
the paracone and metacone. The protocone is represented by a 
large worn surface, whose interior extremity is unfortunately broken 
away. The paraconule forms a narrow transverse crest which passes 
in front of the paracone. The metaconule on the other hand is 
within and anterior to the metacone. 
The alveolus is all that indicates the character of the inferior 
canine. It is deep, extending to the base of the ramus, and is directed 
with a straight axis, a little forward of upward. The side is longi- 
tudinally keeled near the fundus on the external side. The anterior 
three inferior premolars are very narrow, extending transversely 
across the alveolar line, with divergent roots. The crowns are so worn 
that their structure is not determinable. The first inferior premolar, is 
very robust, its crown equaling those of the other three in antero 
terior diameter. The horizontal section of the crown is a longitudinal 
ovoid. The anterior border is broadly rounded; the posterior bilobate, 
the internal lobe more prominent than the external. There are two 
roots, of which the posterior is grooved on the internal side, giving the 
appearance of three roots, a form to which the alveolus is adapted. 
Two grooves rise from these grooves on the inner side of the crown, 
and there are two or three obscure grooves on the external side. 
Enamel rough. Roots with cementum layer, which forms a narrow 
ledge round the base of the crown. Like the superior true molar pre- 
served, the inferior truemolar is remarkable for its small size as com- 
pared with the premolars. It is of robust form, presenting anteriorly 
a transverse trigon, which is worn to a uniform surface im the speci- 
men, but displays traces of the paracone and metacone. A strong 
cingulum marks the external part of the anterior base of the proto- 
cone. The heel is short and wide, and has a raised border surround- 
ing a basin. The border consists of external and internal compressed 
cusps, and a small median one soon confluent with the internal one. 
No cingula other than the one deseribed. The last inferior molar has 
left only the base of its heel, which was evidently more elongate than 
that of the other molars. The coronoid process has a base much 
extended anteroposteriorly; it is broken off. The masseteric fossa 
has a strong anterior rib border, but the inferior border is very promi- 
