343 
PAL^OSYOPS LEIDY, AND ITS ALLIES. 
terior part of this tooth is broken off in Marsh’s specimen, so that the presence of a 
posterior intermediate cone is uncertain. In the last superior molar in Marsh s 
example the protoconule of one side is well developed, without a metaconule, but 
on the opposite tooth the metaconule is well developed. There is no trace ot rudi- 
mentary hypocone on the last superior molar. 
Telmatotiierium cultridbns. 
(Syn . — Leurocephalus cidtridens S. & O.') 
Dentition, (PL XII, figs. 12, 13). — The basal ridges of the incisiors are very 
strongly marked. The external incisor is a very large canine-like tooth, and is sep- 
arated 1:)y ([uite a long interval from the canine. The canine is long and slender, its 
external face is strongly convex, the posterior being concave ; the anterior and pos- 
terior cutting edges of the canine are sharply marked off from the body of the tooth and 
extend along the whole length of the same. The first premolar shows a postero-longi- 
tudinal ridge, which has on its internal side a small tubercle in connection with the 
internal cingulum of the tooth. There is no rudimentary lobe on the first premolar 
anterior to the principal lobe. In the following premolar its external face is nearly 
straight, high and not separated by a median buttress. The vertical folds and 
cingula of the anterior lobes of the premolars are strongly expressed. The second 
premolar has only a rudimentaiy internal lobe which consists of an elongated ridge 
with a small, distinct, posterior tubercle. At its posterior portion the internal 
cingulum is distinct from the ridge referred to, but anteriorly they coalesce and run 
together as far as the anterior buttress of the tooth. The internal lobes of the last 
two premolars are slightly concave on their external sides, and give off laterally 
crests which do not reach as far as the external lobes. The last tAvo premolars have 
strongly marked internal basal cingula Avhich are complete, the internal median 
portion of the cingnla rising upon the inner face of the cone of the teeth. There 
are no traces of intermediate connles upon the superior premolar series. 
Siiperioi' molars . — The external cingulum of all the true molars is strongly 
marked in T. cidtridens, and it extends all across the face of the teeth and is 
prolonged upon the anterior and median buttress. The median buttress is very large, 
and its superior portion is shut off entirely from the median valley of the molar. 
The anterior cingulum of the molars is large, its inner half especially having a con- 
siderable vertical height. All the molars have well developed cingula, that of the 
last molar being complete. The intermediate conules are unusually reduced; 
on the first molar there is only a Ami’y small protoconnle ; the second and 
last molars are totally Avithout intermediate connles. The internal cones of the 
molars are A^ery high and sharp as compared Avith those of P. paludosns. The hypo- 
cones of molars I and 2 are smaller, and placed nearer to the posterior internal angle 
^Rep. Prill. Scien. Expect, of 1877, 1878, page 42. 
