NOTICE OF SOME NEW REPTILES FROM THE UPPER 

 TRIAS OF WYOMING. 



The University of Chicago paleontological expedition to Wyoming 

 the past summer was fortunate in securing a vahiable collection of 

 stegocephalian and reptilian remains from the Trias, a part of which 

 is described in the present paper. 



The beds whence the fossils were obtained, from forty to eighty feet 

 in thickness, are about two hundred feet below the top of the red-beds 

 and about six hundred feet above their base. Their description will 

 be given in a later paper by Mr. N. H. Brown, their discoverer, atid 

 the writer. Meanwhile the horizon may be distinguished by the 

 name Popo Agie^ beds, as suggested by Mr. Brown, from the Popo 

 Agie River, along whose branches they are most characteristically 

 shown. 



Dolichohrachium gracile, gen. et sp. nov. 



C or aco- scapula (Fig. i). — Scapula elongate, flattened, directed 

 backward nearly parallel with the long axis of the body; the blade 

 elongate, moderately thickened, and of nearly equal width throughout ; 

 back of the middle of the lower margin, there is a slight angular pro- 

 jection. Anteriorly the bone curves sharply downward to the glenoid 

 fossa, at right angles to the shaft, and has a free, thin, rounded margin 

 in front. The upper margin of the glenoid fossa is thick, prominent, 

 and rounded, supported by a strong thickening of the bone above it; 

 in front this thickening has a heavy, rounded margin standing out 

 prominently from the thinned anterior plate of the scapula. The 

 fossa has no rim in front, the surface blending into the non-articular 

 sloping surface extending to the thin front margin of the bone. Nor 

 is there a rim behind, but below the border is very prominent, more 

 so than the upper border, though thinner, the bone being excavated 

 below it to form an obliquely projecting rim. Coracoid elongate 

 antero-posteriorly, the anterior part directed strongly inward; the 

 posterior margin nearly on the same plane as the glenoid fossa and 



I Pronounced popo azhie, or, in the vernacular, popozliie. 



