35 
1888.) 65 [Cope. 
latter a little benind opposite the former, and connected with them by an 
obscure intermediate tubercle. The latter is so far fused to the other two 
as to give a pair of transverse ridges somewhat depressed in the middle. 
The posterior intermediate on the last superior molar is a little in front of 
the larger ones which it connects, and a third intermediate is situated be- 
hind the space between the latter. This third intermediate is an upward 
production of a broad cordiform posterior cingulum of the crown. The 
external cusps on all the true molars in this species are remarkable for 
having their external faces flat, having thus distinct anterior and posterior 
edges. The internal face is convex to angular. There is a complete deli- 
cate external cingulum, and a wide anterior cingulum, but no internal 
cingulum. The first premolar has a nearly square outline instead of being 
transverse, as in the other species, and has one external and one internal 
cusp, connected by an elevated ridge. No rudiment of external second 
cusp. ‘The internal cusp is much smaller than the external. A com- 
plete cingulum, except on the internal side; the external a delicate one. 
Second premolar with greater anteroposterior extent than the first. Its 
base contracts inwards through the obliquity of the external side. The 
crown is lost. The internal outline of the last four molars is straight, the 
external a little convex. The second premolar’s form adds to the con- 
vexity. The alveolar border in front of the second premolar is broken, but 
there is no trace of alveoli or roots of another premolar until we approach 
the canine alveolus. Here a single root indicates a rather small fourth (or 
? third) premolar. Its long diameter is directed inwards and forwards. 
‘The canine is large, but the root only remains in the alveolus. Its out- 
line is that of an isosceles spherical triangle, with the apex directed pos- 
teriorly and outwards. Its alveolus occupies an enlargement of the max- 
illary bone, which is excavated on the anterior face to receive the apex of 
the inferior canine. This fossa has an acute posterior and superior border. 
In front its border is excavated by the alveolus of the large third superior 
incisor, 
Measurements. 
M. 
MAPOTORDIa WIGth te see ek tes cede wc a's eeNices aaese 7. 00D 
Depth to alveolar border at front of orbit............. .080 
Length from orbit (between notches) to canine fossa... .091 
Width of palate at p.m.i..... ies cccdvec@enevrs est #0200 
ny oc oO ms i Cimiddle) ries. eas woe vbewe > 08d 
doeneth Of Molar series... 6.215502). ees Si Cour ee see 00LO 
te  UPUG DAOLNIN secs ces ce eet 044 
ave SM DBEG OL Dally UL viii ssa ect aeee eee eres 6010 
Diameters p.m. i f anteroposterior ..... Se aries bare eose eee) OUDD 
WIATISVOISC) 0c sc als ous ta vecss ss steesoee ce 00UD 
Diameters m. i \ cohmh abietaisahe: eae een ieee: fees ULL 
SEMMSVOISO Ss woaes sis00 W008 Jee ea ewes, SOLED 
PROC, AMER. PHILOS. SOC. xxv, 127. I. PRINTED APRIL 3, 1888. 
