4()2 ClEOLOCiY OF THE BLACK HILLS. 



TcrchratuUi Itclciut WliitC, Kept, of n IJecounaissance of the IMack Tlills of Dakota, by 

 Lieut. Col. Ludlow, p. lO.'J, IM. — , fifjs. r>-10. 



A large species, related to T. harlani Mort. From No. 4, northeast 

 Black Hills, north of Belle Fourche. 



Ostrea congesta Couracl. 



Abundant on the Cheyenne River, near the Black Hills, Niobrara 

 Group, 



Gryphcea vesicularis Lam. . 



Mr. F. B. Meek cites this species with doubt as from the Fort Pien-d 

 Group, on the Cheyenne River, near the Black Hills. 



Nucula suhnasnta H. & M., Mem. Best. Acad. Arts and Sci., 1856,= Yoldia snbnasuta 

 Meek, Check List Smith. Inst., p. 8. 



Sage Creek, upper part of No. 4. 



Yoldia ventricosa = Nucula ventricosa H. & M., Mem. Acad. Arts and Sci., new ser., vol. 

 V, p. 385, PI. 1, fig. 11 



Sage Creek, Foil; Pierre Group. 



Caprinella coraloidca H. & M., Mem. Bost. Acad. Arts and Sci., 1850, p. 380, PI. i, fig. 3, 

 = Icthyosarcolithus coraloidea (Gabb.) Meek, in Check List Smith. Inst. Cret. 

 Foss., p. 5. 



In upper part of No. 4, Sage Creek. 



Sphwriola ? icarrenana Meek, Pal. U. S. Geol. Surv. Terr., p. 138. 



A species nearly related to S. transversa, herein described. From the 

 Fox Hills Group, near the eastern base of the Black Hills. 



CalHsta {Dosiniopsis) nebrascensis ]M. «& H. = CallLsIa nebrascensis M. & H. = C. deiceyi 

 var. robunta M. & H., and Dione nebrascensis Meek. See PaL U. S. Geol. Surv. 

 Terr., p. 184, figs. 15-17. 



A species closely related to C. deweyi Fort Pierr^ Group, Cheyenne 

 River, Black Hills. 



Callista {Aphiodina ?) tenuis (H. & M.) Meek, Pal. U. S. Geol. Surv. Terr., p. 188, = Cy- 

 thcrca tenuis FI. & M. = Meretri.r tenuis M. & H., also Dione f tenuis Meek. 



South fork, Cheyenne River, Black Hills, Fort Union Group. 



