PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 137 



The following is a list of them so far as their specific and generic 

 identity could be determined : 

 CaUianassa ulrichi White. 

 Tubulostiuni dickhauti White. 

 Nautilus texanus Shumard. 



Turritella ? apparently two specieS;. 



Anchura ? 



Lunatia ? 



Corbula'i ? 



Cytlierea ? 



Crassatella% 



Axincca ! 



Cucullcca ? 



Idonearca 1 



Modiola — ? 



Ostrea ? 



Grypkcca pitcheri Morton ? 



Spines of an Echinoid. 



The two species described in this article as new were collected by Mr. 

 Cleburu in the valley of South Platte Eiver, a few miles from Jules- 

 burg, Colo. He found associated with these two species several other 

 molluscan forms, all of which are characteristic of the later Cretaceous 

 strata, equivalent with those of the Upper Missouri Eiver region, which 

 are generally known as the Fox Hills and Fort Pierre Groups. The 

 following is a hst of the species collected by Mr. Cleburn, so far as they 

 are determinable : 



Nautilus dekayi Morton. 



Placenticeras placenta Dekay. 



Scaphites conradi Morton. 



Turris [Sercula) contortus Meek & Hayden. 



Cantharus'l julesburgensis (sp. no v.). 



Pyropsis hairdi Meek & Hayden. 



Fasciolaria [Piestoclieilus) culbertsoni Meek & Hayden. 



Pyrifusus suhturritus Meek & Hayden. 



Anchura americana Meek & Hayden. 



Lucina clehurni (sp. nov.). 



Solemya bilix White. 



Inoceramus harabini Morton. 



Following are descriptions of the two new species before referred to, 

 and also references to the other five Cretaceous species which were 

 described in volume III, all of which are illustrated on the accompany- 

 ing plate in this volume. 



Cajllianassa uleichi White. 



(Plate — , Figs. 10 and 11.) 

 CaUianassa ulrichi, White 1880, Proc. U. S. National Museum, vol. iii, p. 161. 



