156 
INSECTIVORA. 
the posterior V becoming a curved median cutting-edge, and the anterior V 
opening into a crescentoid section; it rises to an acuminate apex, having 
thus a rather sectorial character. In the three true molars, there is a small 
tubercle at the inner base of the posterior limb of the anterior V, Posterior 
V much lower. ' Enamel smooth. 
Measurements. 
Length of the four last molars. 
Length of the three last molars. 
Length of the penultimate molar.. 
Width of the same.... 
Length of the last molar... 
Width of the same. . 
Depth of the jaw at the last molar. 
M. 
0. 035 
0. 026 
0. 008 
0. 005 
0. 011 
0. 005 
0. 020 
This species is like the JE. hurmeisterii; but the mandibular ramus of 
that species is relatively deeper. 
Esthonyx hurmeisterii, (Jope. 
Plate xl, fig. 26. 
Report Vert. Foss. New Mexico, U. S. Geog. Survs. W, of 100th M., 1874, p. 7; Id., 
Ann. Report U. S. Geog. Survs. W. of 100th M., 1874, p. 119. 
A species nearly allied to the E. bisulcatus, the type of the genus, is 
represented by a portion of the right mandibular ramus, with the last molar 
tooth in perfect preservation. While the jaw is of a depth similar to that 
of the E. hisulcatus, it is more slender in its proportions. The molar, also, 
while of nearly the same length, is relatively narrower, especially in its 
anterior portion. The crown of this tooth is worn in the specimen, and the 
anterior portion is elevated above the posterior, and displays a trace of the 
notch of the inner margin already observed in the species last described. 
The composition of the tooth is similar in other respects. No cingula. 
Enamel smooth. 
Measurements. 
Length of the last lower molar. .. . 
Leugth of the last lower molar from the anterior tubercles 
Width . 
( posteriorly.. 
Depth of the ramus at the last molar.. . . 
M. 
0. 009 
0.OOCO 
0.0050 
0.0025 
0. 0240 
