AKTIODAOTYLA. 
320 
Procam-elus occidentalis, Leidy. 
Plates liii, fig. 2; Ixxvi; Jxxvii, figs. 1-3; Ixxviii, figs. 1-9; Ixxix. 
Leidy, Proc. Phila. Acad., 1858, pp. 23, 89 ; Extinct Mammalia Dakota and Nebraska, 
1869, p. 151.—Cope, Ann. Eept. Chief of Engineers, 1875, ii, p. 990, pi. ii. 
The cranium and a considerable part of the skeleton of this species 
were excavated from a soft calcareous sandstone near the Pueblo village of 
Pojuaque by myself and assistant, and were preserved in good condition. 
Tliey have given to paleontologists the first definite information as to the 
structure ot the limbs and cranium in this genus of extinct Camels. 
The cranium is long and anteriorly narrow; its width is about equal 
to that of the Llama, but it is considerabl}^ longer, the excess being chiefly 
in front of the orbits. The sagittal crest is short and continues into the 
exoccipital crests, which themselves continue forward into the zygomata. 
The brain-case is rounded laterally and above in cross-section, descending 
slightly to the interorbital region, which is plane. The nasal bones are 
elongate and quite narrow, but do not project beyond the anterior border 
of the premaxillaries, with which their lateral borders are in contact for 
nearly an inch. The premaxillaries are produced downward and forward, 
and are of subequal width, until they turn horizontally forward, when they 
narrow to a slightly recurved acuminate apex. About half-way between 
this point and the orbit, the maxillary bone is extensively concave, thus 
narrowing the straight bridge of the nose. The space above the diastema 
is also concave in a longitudinally oval form. The malar ridge of the 
maxillary is not very prominent, continuing into the beveled and grooved 
inferior face of the malar bone. The anterior part of the latter rises to a 
point a little above the middle of the front of the orbit, and is in contact 
with the entire inferior border of the lachrymal. The lachrymal is a wide 
subparallelogrammic bone, wider behind, with its long axis directed down¬ 
ward and forward. It separates the lachrymal sinus by a rather narrow 
space from the orbit. The lachrymal sinus is large, longitudinal, and dia¬ 
mond-shaped ; the maxillary or antero-inferior and the frontal or postero- 
superior borders being the longest. The orbit is completely closed, and is 
nearly round. Its superior and posterior borders are crenulated; the inferior 
is thin and entire. The low ridges from the postfrontal regions which bound 
the temporal fossse do not unite anterior to the middle of the parietal bone. 
