9 
between the D. sideropelicus and the Empedocles molaris in the form of the 
molar teeth. The species are distinguished as follows : 
Much inequality in the elevation of the extremities of the molars ; 
lower tubercle small ..........0e.eeeee ve eee ek ess eees D. sideropelicus. 
Extremities of molars not very anequal in height; lower tubercle 
large....... pees eeasans shencenl sie seah.sis ree Seana D. phascolinus. 
DIADECTES PHASEOLINUS Cope. sp. nov. 
This species is represented in my collection by the maxillary bones of 
three animals, and a portion of the mandible with most of the tooth line 
ofa fourth. These fragments are of about the size of the D. séderopeticus 
and Hmpedocles molaris. 
The molars possess a low cusp which is nearly in the middle of the tooth. 
Of the lower and external cusps, the internal is the wider and more round- 
ed; when unworn it is as clevated as the external, but it is soon reduced 
by attrition. The external part of the tooth is somewhat narrowed, and 
there is no horizontal surface on either side of the median cusp, as in Him- 
pedocies molaris. The last maxillary tooth is rather small; preceding it 
are eight wide transverse ones, and then two less extended transversely 
before reaching the broken end of my best specimen. The anterior of these 
is elongate, and may be caniniform, but its apex is lost. External layer 
smooth ; some wrinkles round the base of the median cusp. 
The broken base of the molar bone is subround and small, and shows. 
that that element is slender below the orbit. 
The portion of mandible preserved is quite deep, and is incurved at the 
symphysis. But few of its teeth are preserved, and it is not possible to 
say how long the anterior ones with subround bases may have been. The 
molar whose crown is preserved does not differ materially from those of 
the maxillary series. The alveolar line does not retreat inwards from the 
external border as in Himpedocles latibuccatus, resembling in this respect 
the D. stderopelicus. The external surface of the lower jaw is roughened 
by shallower and deeper small or minute pits closely placed. 
Measurements. M. 
Length of series of eleven maxillary teeth........+..... .075 
Length of series of seven widest molars....... wousieiis’ .048 
2 F anteroposterior.............0. .006 
Dinmister witlest molar { transverse. ..... éarapenaveaiweeies 016 
Depth of mandible externally...... a astibe a tae otras . 050 
Width of mandible at middle....... ccc ec eee eee eee ee eee 026 
It is possible that it may yet be necessary to refer this species to Hm- 
pedocles. 
: EMPEDOCLES Cope. 
Proceedings Amer. Philos. Soc., 1878, p. 516. American Naturalist, 
April 22, 1878 ; April, 1880. 
Iam acquainted with two species of this genus, # molaris* and &. laté- 
* Diadectes molaris, Amer. Naturalist, 1878, p. 565. 
