Ta 
1883.} 317 (Cope. 
Measurements. M. 
‘ienctentok Mot SANtCTOPOStCTION... cree ee rereeeeeees .0058 
{TAN GVOTEO sys oe \ spe apie wimlativese Sareutere) SUUDO 
Wate ote Nadie ANteYOPOSteTIOL...ceserereeevoineee -00B0 
HHS MUST Guanes’ Meare w Vide busldtese’s 1s OUR) 
A pair of mandibular rami, found on the same day, and at or near the 
same place, probably belong to the same species, if not to the same animal, 
they support all the teeth, but only the P-m iv and the M. iand ii have 
yet been disengaged from the matrix. The P-m, iv is rather large and 
robust, and has a short wide heel, and an anterior cusp which leaves the 
main cusps half way to the apex, or at the same elevation as the internal 
cusp. The anterior three cusps of the true molars are elevated above the 
heel, and the anterior is nearly median, forms no blade with external ante- 
rior, and is smaller than the anterior internal cusp. The heel is well de- 
veloped, and its borders rise in two obtuse open Vs, whose apices look away 
from each other. The internal supports two cusps, the external, but one. 
No cingula ; enamel smooth. 
Measurements of inferior teeth. M. 
Riiahemiitl cian WOOU 
.. 0085 
atte MOO 
UAPADSVOTSA\ sd Vivi sila sameness sOUBO 
Length of bases of my Landi, i.e ices ve eee vee sie, pOLL0 
From Upper Puerco; D. Baldwin. 
nN: . : anteroposterior... 
Diameters of P-m. iv ie | 
APATIGY OLBG wae biavein eee 
faNteropOsterxiOn...os.cesn ibe edis 
Diameters of m. ii 
1 % 
T RICENTES IN ALQUIDENS, Sp. NOV. 
This species is represented by two mutilated crania, obtained on the 
same day and near the same locality as the preceding species. One of 
these, which I select as type, embraces the muzzle and palate anterior to 
the posterior border of the maxillary bone. 
Besides its inferior size, other characters distinguish this species. The 
simplicity of the superior molars is seen in no other, and the very reduced 
size of the third superior molar is not found in any of its allies. This is 
correlated with an oblique reduction of the maxillary bone behind, which 
gives the second true molar an oblique external border instead of the longi- 
tudinal one seen in the other species. The external cusps of the molars 
are conic, and are not in contact at the base. The internal cusp is also 
conic, and is larger than the external. The internal cusp of the fourth pre- 
molar is large. It is probablé that the third premolar supports an internal 
cusp, as the crown base is as wide as long. The premolars are spaced in 
this species, as in the last, but the diastema is shorter than in the 7. crassi- 
colledena, not exceeding the premolar interspaces. The external cingulum 
8 quite weak. The canine alveolus is large. The incisors are wanting, 
but the premaxillary region is wide. The inferior dentition is unknown. 
