8 
Meusurements. M. 
Width of crown of first tubercular.............0000-05 . 0065 
Depth of ramus at P. M. 2...... snteangnitns blah Ruane ace 024 
om 88 GE SECON IAs, aeosc cies a eared sed Re Bite .028 
Thickness <‘* SE Cero ee rare Speers dash .010 
Canis CUSPIGERUS, sp. nov. 
This peculiar species is indicated by the greater part of the cranium with 
dentition, to which are united both rami of the lower jaw with nearly all 
of the teeth in place. These indicate a dog of small size, about equaling 
the Canis yregarius Cope, but one presenting marked characters. 
The third premolar tooth in both jaws differs from the corresponding one 
in the C. gregarius and in most recent species, in lacking the lobe of the 
posterior cutting edye, agreeing in this (as regards the inferior series) 
with the Temnocyon ultigenis. It is present in the fourth inferior premo- 
Jar, which has besides, a low heel. The inferior sectorial tooth is charac- 
terized by its great robustness ; the internal median tubercle is much ele- 
vated, while the principal cusp is short. The heel is wide and basin-shaped, 
with the inner border as much clevated as the outer. The first tubercular 
molar is characterized by its width as compared with its length being nearly 
as wide transversely as fore and aft. It has two anterior cusps followed 
by ® basin with elevated borders simulating two posterior cusps. There 
are an anterior and a exterior cingulum. The second tubercular is a min- 
iature of the first, differing in the more robust external posterior cusp, and 
the absence of external basal cingulum. There are no complete cingula 
on the external bases of the other inferior teeth. The second superior 
tubercular is well developed, having two external tubercles. The anterior 
inner cusp of the superior sectorial is dis!inct'and acute, and there is a 
cingulun along the inner base of the crown. The exserted portion of the 
canines is Jong, slender, and with an oval section narrowed behind. The 
enamel of all the molars is more or less rugose, a character which is only 
found amony our extinct dogs in the C. gelsmardunus. 
The mandibular rami are shallow, and their inferior margin is not stout. 
A gentle clevation of the latter commences below the first tubercular tooth 
and the alveolar border rises but little behind. The masseteric fossa is deep 
and well defined. 
Measurements. M. 
Length of inferior molar series... ... 
es bases Gf MUL PreMOMNTS ..5 06.4 ¢ceasecuws aes 023 
DAS@OP S6COitls nan eoen Goedueuin tae 005 
Elevation crown fas Die gel it devs re 005 
Length of base of fourth KC weemgan sedaegtl sees 0072 
Elevation of crown “ i gileahg Re aae Relies eae 9055 
Leveth.ofr PASE Of SCCtOrial:. 25 ccs Rae oe tees ease aawes -010 
Elevation Of principal CGS: sacs vie ee oe cave oceune cn es 006 
Width of lieel of sectorialicsscannnog ssxnewnadadvexone ee 006 
