TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 657 



337. Thetis ? circularis (Meek and Hayden). Holotype and 



340. paratypes. 



Fort Pierre (Cret. ) . Near Black Hills on Cheyenne River, 



South Dakota, and near mouth of Milk River, 



Montana. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, p. 190, pi. 17, 

 figs. 8a-c. 



12330. Thetis circularis (Meek and Hayden). Plesiotypes. 



Fort Pierre (Cret.). Black Hills, South Dakota. 



Whitfield, Rept. Geol. and Resources Black Hills Dakota, 1880, 

 p. 417, pi. 11, figs. 22-24. 



See Venus ? circularis. 



211. Thracia ? arcuata Meek and Hayden. Holotype. 



Jurassic. Southwest base of Black Hills, South Dakota. 



Meek and Hayden, Proc. Acad. Nat. Sci. Phila. for 1S60, p. 182; 

 Pal. Upper Mo., Smithsonian Cont. to Knowl., No. 172, XIV, 

 1864, p. 102, pi. 4, fig. 8. 



107399. Thracia dilleri Dall. Holotype. 



Eocene. Coos Bay, Oregon. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 189S, 

 p. 929, pi. 34, fig. 19; Pt. VI, 1903, p. 1524. 



188. Thracia gracilis (Meek and Hayden). Holotype. 



Fox Hills (Cret.). Mouth of Judith River, Montana. 

 Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, p. 224, pi. 39, fig. 6b. 

 See Tellina gracillis. 



28962. Thracia ? montanaensis (Meek). Holotype. 



Jurassic. Devil's slide, Cinnabar Mountain, Yellowstone 

 River, Montana. 



Stanton, Mon. XXXII, Part II, U. S. Geol. Surv., 1899, p. 62S, 

 pi. 73, fig. 10. 



[Probably holotype of Corimya montanaensis Meek. T. W. 

 Stanton.] 



8029. Thracia myaeformis White. Holotype. 



Cretaceous. Bell County, Texas. 



White, Proc. U. S. Nat. Mus., II, 1879, P- 2 97- pi- 6, figs. 1,2; 

 Twelfth Ann. Rept. U. S. Geol. Surv. Terr., 1883, p. 23, pi. 17, 

 figs. 2a, b. 



189. Thracia ? prouti (Meek and Ha}^den). Holotype. 



Fox Hills (Cret.). Mouth of Judith River, Montana. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1S76, p. 225, pi. 37, figs. 

 6a, 6b. 



See Tellina prouti. 



12253. Thracia subgracilis Whitfield. Holotype. 



Fort Pierre (Cret.): Cheyenne River, near French Creek, 

 Black Hills, South Dakota. 



Whitfield, Rept. Geol. and Resources Black Hills Dakota, iSSo, 

 p. 419, pi. 11, figs. 29, 30. 



23232—05 42 



