1895.] 



MK. P. A. BATHER ON tJIXTACEIXUS. 



975 



solved, not by renewed specuLition, but with the aid of fresh facts 

 and more detailed description. To bring such aid is the object of 

 this paper. 



It was in 1S70 that, through one of the exploring expeditions 

 of Prof. O. C. Marsh (1), an imperft'ct specimen was found in the 

 eastern Uintah mountains, lying " in a stratum of j'ellow calcareous 

 shale " and immediately over "a thin layer full of Ostrea conr/csta, 

 Conrad, a typical Cretaceous fossil," and associated with the scales 

 of a Beri/x. This specimen was not sutiicient for description, but 

 ill 1875 further specimens, somewhat exposed and weathered, 

 were discovered by Prof. Mudge and his party in the middle of 



Uintacrimis i'ocialis, one of the co-types, f'roiu Niobrava Chalk, W. Kansas, now 

 in Yale College Museum. Eeprodnction of GrinnelFs illustration, Amer. 

 Journ. Sci. vol. xii. pi. iv. fig. 2. The lower portion of a weathered speci- 

 men is seen surrounded by a mass of arms belonging to other individuals. 

 Natural size. 



62* 



