3 
Measurements. M. 
Width of crown of last molar... .....c...0.0c eee eens -0015 
Length from M. 1 to infraorbital foramen.............. .007 
Depth of mandibular ramus at M. 2...........00. 00005 .006 
Width of face of inferior incisor ........ (Weeeaaneees .0016 
ENTOPTYCHUS PLANIFRONS, sp. nov. 
A larger species than the EZ. cavifrons, represented in my collection by 
parts of crania, and rami. The former show that besides the superior size, 
this species differs from the Z. cavifrons in the absence of the superciliary 
ridges, and hence perfect flatness of the interorbital region. The latter is 
also wider, measuring five-sixths the width of the muzzle at its middle, 
while in the #. cavifrons it is only half as wide. The subjoined measure- 
ments give the characters in detail. 
Measurements. M. 
Width of interorbital space. ....... 0.0.0.0. c cece eee eae 007 
a muzzle at middle... ...... 6c. cee cee ee ees -0086 
Elevation of skull from second molar............2.-6- .01380 
Length of inferior molar series............... 200000 -0072 
Depth of ramus at M. 2.2.0.0 cc ce cee cece eee eee 0072 
Width of inferior face at M. 2............. 00 cece eee .0043 
a8 i ANGCISOD« wcewarsavraxeavenane tage to .0018 
Distance between infraorbital foramen and M. 1,...... .0050- 
ENTOPTYCHUS CRASSIRAMIS, Sp. nov. 
This, the largest species of the genus, appears to have been less abundant 
than the two already described. I refer to it portions of two crania and 
three mandibular rami, found separately. The superior size of the parts is 
obvious, the posterior three superior molars having the same longitudinal 
extent as the entire series of the H#. cavifrons. The gradation in the size 
of these teeth, is as in that species, the grinding surfaces diminishing 
rapidly in extent posteriorly. The superciliary ridges are not well pre- 
served, but were probably thickened as in Z. cavifrons, and the interor- 
bital space was relatively as narrow, and not so wide as in E.planifrons. 
The measurements below exhibit the characters more exactly. 
Measurements. M. 
Width of skull between orbits........... 020.0000 cee ee .007 
Elevation of skull from second molar..........-...-0-5 015 
Length of series of superior molars.......--...--+ + eee 0115 
antero-posterior. .........66 008 
{PANSVETSES 00 coe sad aa cee 004 
antero-posterior. ........-. 002 
{PAUSVCTSCics cee sd eae a oe .002 
Diameter of second molar 
Diameter of fourth molar { 
In the mandibular rami the inferior masseteric ridge extends to below . 
the anterior border of the first molar, and is very prominent and acute. 
It results that both the exterior and inferior aspects of the ramus are con- 
