4(32 GEOLOGY OF THE BLACK HILLS. 



Terebratula Jielena Whitf., Eept. of a Keconnaissance of the Black Hills of Dakota, by 

 Lieut. Col. Ludlow, p. 103, PL — , figs. 5-10. 



A large species, related to T. liarlani Mori From No. 4, northeast 

 Black Hills, north of Belle Fourche. 



Ostrea congesta Courad. 



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 Pierre" 

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



Nucula subnasuta H. & M., Mem. Bost. Acad. Arts and Sci., 1856, = Yoldia subnasuta 

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



Sage Creek, upper part of No. 4. 



Yoldia ventricosa = N'ucula ventricosa H. & M., Mem. Acad. Arts aud Sci., new ser., vol. 

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



Sage Creek, Fort Pierre Group. 



Caprinella coraloidea H. & M., Mem. Bost. Acad. Arts and Sci., 1856, p. 380, PL i, fig. 3, 

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



Foss., p. 5. 



In upper part of No. 4, Sage Creek. 



Sphceriola ? ivarrcnana Meek, Pal. U. S. Geol. Surv. Terr., p. 138. 



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

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



Callista {Bosiniopsis) nebrascensis M. & H. = Callista nebrascensis M. & H. = C. deiveyi 

 var. robusta M. & H., and Bione nebrascensis Meek. See Pal. U. S. Geol. Surv. 

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



A species closely related to C. deiveyi Fort Pierre Group, Cheyenne 

 River, Black Hills. 



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

 therea tenuis H. & M. = Meretrix tenuis M. & H., also Dione f tenuis Meek. 



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



