PFIOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 137 



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

 identity could be determined : 

 Callianassa ulrichi White. 

 Tuhulostium cUcMauti White. 

 li'atitilus tcxanus Shumard. 



Turritella ? apparently two species,. 



Anchura ? 



Lunaiia ? 



Corbulal ? 



Cythcrca ? • • 



Crassatella^ ? 



Axincca ? 



Ciicullcca - 

 Idonearca 

 Modiola — 

 Ostrea 



Gryphcca pitcheri Morton 1 



Spines of an Echinoid. 



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

 Cieburn in the valley of South Platte River, a few miles from Jules- 

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

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

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

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

 following is a list of the species collected by Mr. Cieburn, so far as they 

 are determinable : 



Nautilus dekayi Morton. 



Placeiiticeras placenta Dekay. 



Scaphites conradl i\Iorton. 



Turris {Sercula) contortus Meek & Ilayden. 



Gantharu^'} jiile-sburgensis (sp. nov.). 



Pyropais bairdi Meek & Ilayden. 



Fasciolaria {Plestocheilus) culhertsoni Meek & Hayden. 



Pyrifusus subturritus Meek & Hayden. 



Anchura americana Meek & Hayden. 



Lucina clcburni (sp. nov.). 



Solemya bilix White. 



Inoceranius barabini Morton. 



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

 and also references to the other five Cretaceous species whi(;h were 

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

 ing plate in this volume. 



Callianassa ULiiicni White. 



(Plate I, Figs. 10 and 11.) 

 Callianassa ulrichi, White 1830, Proc. U. S. Nalioual Museum, vol. iii, p. IGl. 



