86 RHINOCEROS. 
posterior three molars, and on the outer side of the posterior lobe of the same teeth, 
except the last. Between the bases of the lobes externally it forms a small 
tubercle. 
Other Teeth—No incisors are preserved in any of the specimens, but from a 
portion of alveolus preserved in one of the latter, already referred to, it is of course 
conclusive that incisors existed in the adult, at least in the upper jaw. 
MEASUREMENTS OF THE HEAD AND TEETH, 
Lines. Inches. 
Length of skull from the upper margin of the occipital foramen to the inter- 
maxillary bone . 3 » : . : we 
Length of skull from same monitibn to the first are ‘ : ’ ; = BLD 
Breadth of inion at the mastoid processes; estimated 
Greatest breadth at the zygomata 4 
From the tip of one post-glenoid tubercle to re others if estineiad : 
Distance from the meatus auditorius externus to the lachrymal tubercle . 
Height of face from alveolar margin on a line with the anterior orbital margin 
Height of face from alveolar margin on a line with the infra-orbitar foramen . 
Greatest breadth of forehead at the supra-orbitar processes 
Length of upper molar series 
Greatest breadth of seventh molar 
Greatest breadth of sixth molar . 
Greatest breadth of fifth molar 
Greatest breadth of fourth molar 
Greatest breadth of third molar 
Greatest breadth of second molar 
Greatest breadth of first molar : 
Antero-posterior diameter of last lower molar 
Antero-posterior diameter of the third lower molar 
el ee a a lo UU oo, 
KHowndorantTnmnaTtTwooananadacoeoreo 
Rhinoceros Nebrascensis, Lrmy. 
(Piate XIV., XV.) 
Rhinoceros Nebrascensis, Leidy: Proc. Acad. Nat. Sci., 1850, v., 121; Owen’s Rep. of a Geol. Surv. of 
Wisce., etc., 556. 
Aceratherium Nebrascensis, Leidy: Proc. Acad. Nat. Sci., 1851, y., 331. 
Of the smaller Rhinoceros of Nebraska we possess portions of at least twelve 
different individuals, as follows :— 
1. The anterior portion of a skull, accompanied by the lower jaw, of an adult 
individual. The former has the forehead, orbital entrance, and molar teeth well 
preserved, but the face is very much broken, and its nasal part is displaced. The 
lower jaw contains all the molars in perfect condition, but it has lost its rami and 
the symphysis. (XIV. 1-3.) From Captain Stewart Van Vliet’s collection. 
2. A much mutilated face, containing on both sides the molar teeth nearly per- 
fect. It belonged to a nearly adult individual, as the teeth, which belong to the 
permanent series, are all in place except the last, which has about two-thirds 
protruded. (XIV. 15.) From the collection of Dr. Owen. 
3. The skull, accompanied by a small fragment of the lower jaw, of a very old 
individual. The former has its upper part broken away, but the base is nearly 
