1883.J ^"J^ [Cope. 



to the axis of the jaws. This fissure is not so distinct in the mandibular 

 teeth. The median cusp has a straight edge at riglit angles to the long 

 axis of the crown. The specimen where the entire dental series of one side 

 is preserved, shows that the latter has a sigmoid flexure, the middle of the 

 maxillary bone being incurved, and the anterior part convex outwards. 

 There are five or six conic teeth between the incisors and the molars. 



The inferior surface of the sphenoid bone is medially flat in transverse 

 section, and concave anteroposteriorly, in this resembling U. phaseolinus 

 rather than E. molaris. The upper jaw specimen shows that the muzzle 

 projects beyond the incisor teeth, which is not the case in E. pJiaseolinus, 

 which has the incisors very prominent. The supraorbital border is regu- 

 larly convex, and not depressed and notched as in E. phaseoUnus and E. 

 latibuccatus. The superior surface of the skull is marked with innumerable 

 small impressed pits, and assumes a spongy appearance above the orbits. 



Measurements. 



No. 1. M. 



Length of last six superior molars 055 



Diameters of antepenult molar -f anteroposterior 010 



t. transverse 020 



{vertical 013 

 transverse (at base) .... .007 

 anteroposterior Oil 



No. 2. 



Length of dental series in a straight line 093 



Width of palate at anterior expanse 062 



" " contraction 068 



" " between widest molars 036 



Discovered by Mr. W. F. Cummins. 



Empedias phaseolinus Cope, Proceeds. American Philosoph. Society, 

 May, 1880 {Diadectes). 



The fine specimen of this species above mentioned, which was obtained 

 by Mr. Cummins, includes some parts of the skeleton not or rarely found 

 hitherto. The pelvis shows that the corresponding part described by me. 

 Proceedings of the American Philosophical Society, 1882, p. 448, belongs 

 to another species of this group. The clavicles are preserved, and enable 

 me to identify the corresponding part of another species in which the struc- 

 ture is more distinctly visible. This shows an episternum wedged in be- 

 tween the adjacent extremities of the clavicles, which are here very robust. 

 But a small part of it appears in the inferior surface, but superiorly it forms 

 a plate which covers the symphysis of the clavicles, but does not extend 

 posterior to them. The suture of the episternum with the clavicles below 

 is a coarse interdigitation. Posterior to it is the symphysis of the clavicles. 



The skull of this specimen is the first that I have seen ip this group 

 •which possesses a basioccipital bone and condyle. This proves that in the 

 five other crania of allied species, it has fallen out, which indicates its very 



PROC. AMER. PHILOS. SOC. XX. 113. 4b. PRINTED MAT 2, 1883. 



