Cope.] 634 [March 16^ 



Measurements of Skull and Femur. M. 



Diameters of quadrate condyle { ^^^^^'^P^^^^""^' J~^ 



t- transverse 039 



Length of maxillary on alveolar edge 087 



Diameters base of a posterior tooth j ^^^eroposterior 007 



♦- transverse 010 



" of base of another posterior f anteroposterior . . .005 



tooth \ transverse 010 



Length of femur 236 



Proximal diameters of fe^ur { ^^^eroposterior 047 



<- transverse 08o 



Width of shaft 052 



" distally (greatest) 115 



Empedias fissus, sp. nov. 



The species of Empedias form a series which diverges from Diadectes in 

 a successive widening of the crowns of the teeth and diminution in their 

 number. Thus the D. phaseolinus is nearest to Diadectes; D. molaris suc- 

 ceeds it, and in E. fissus we have the molariform character most strongly 

 developed. In the E. latibuccatus, on the other hand, the diminution of 

 the transverse extent of many of the teeth and the areolar sculpture of the 

 superior surface of the cranium points in the direction of the genus Chilo- 

 nyx. The species of Empedias may be easily distinguished as follows : 



L Surface of skull divided by grooves into arese. 

 Superior teeth, 16 on each side, a number on each end of the maxillary 



bone of little transverse extent E. latibuccatus. 



II. Surface of skull uniformly rugose. 

 Superior teeth narrower, 16 on each side, the last one small, sphenoid flat, 



pterygoids narrow E. phaseolinus. 



Superior teeth wider, 14 on each side, the last one smaller, sphenoid keeled 



medially, pterygoids wide E. molaris. 



Superior teeth wider, 14 on each side, the last the largest, sphenoid not 



keeled : E. fissus. 



Of the E. latibuccatus 1 have two specimens with teeth, one including a 

 large part of the cranium and lower jaw. Of the E. phaseolinus I have 

 five specimens with teeth, one of which embraces a nearly • complete skull 

 and a large part of the skeleton. Of the E. molaris 1 have also five indi- 

 viduals, of which three are crania. The E. fissus is represented by two in- 

 dividuals. One of these is one side of the entire upper jaw ; the other is 

 a broken skull with the four series of molar teeth. Of other parts of the 

 skeleton, not identified as to species, I have a large number. 



The Empedias fissus is nearest the E. molaris, and has the same number 

 of teeth. It differs, however, in various essential points. The last max- 

 illary tooth, which is much reduced in size in the E. molaris, is here as 

 large as any of the others. The portion of the crown within the medium 

 cusp is fissured medially in the direction of its length ; that is, transversely 



