1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 297 



JURASSIC SPECIES— Continued. 



Tancredia? inornata (M. & H. sp.) Whitf. 



Rep. Geol. Black Hills of Dakota, p. 368, pi. vi, fig. 13. Mus. No. 12338. Figs. 

 9-12. Mas. No. 12341. 

 Tancredia postica Whitf. 



Rep. Geol. I31ack Hill.s of Dakota, p. 371, pi. vi, fig. 14. Mus. No. 12321. 

 Tancredia vT^arrenana M. & H. 



Pal. Upper Missouri, <^Sinithsonian Cout. to Know. 172, p. 96. Mus. No. 204. 

 Tancredia -warrenana (M. & H.) Whitf. 



Rep. Geol. Black Hills of Dakota, p. 372, pi. vi, fig. 4. Mus. No. 12326. 



Terebratnla angusta H. & Whitf. 



Rep. Geol. Expl. 40th Parallel, vol. iv, part ii, p. 285, pi. vii, figs. 7-10. Mus. No. 

 12548. 

 Thracea? sublasvis (M. &. H.) Whitf. 



Rep. Geol. Black Hills of Dakota, \>. 375, pi. v, fig. 34 (by mistake marked 24 on 

 the plate). Mus. No. 12327. 



Thracia ? arcuata M. & H. 



Pal. Upper Missouri, <^Smithsonian Cont. to Know. 172, p. 102, pi. iv, fig. 8. Mus. 

 No. 211. 

 Thracia? sublaevis M. & H. 



Pal. Upper Missouri, <^Smitli8oniau Cont. to Know. 172, p. 102, pi. iv, figs. 4, a. 

 Mus. No. 197. 

 Trapezium bellefourchensis Whitf. 



Rep. Geol. Black Hills of Dakota, p. 364, pi. v, figs. 1-4. Mus. No. 12303. 

 Trapezium subequalis Whitf. 



Rep. Geol. Black Hills of Dakota, p. 365, pi. v, fig. 6. Mus. No. 12317. Figs. 5, 

 7, 8. Mus. No. 12329. 

 Trigonla americana (Meek) White. 



r2th Ann. Rep. U. S. Geol. & Geogr. Surv. Terr., p. 148, pi. xxxviii, figs, la, b. 

 Mus. Nos. 7794, 7819. 

 Trigonla conradl M. & H. 



Pal. Upper Missouri, <^Smith8onian Cont. to Know. 172, p. 83, pi. iii, fig. 11. Mus. 

 No. 212. 

 Trigonla montanaensls (Meek) White. 



12th Ann. Rep. U. S. Geol. & geogr. Surv. Terr., p. 147, pi. xxxviii, fig. 2a. Mus. 

 No. 7817. 



Trigonia quadrangularls H. & Whitf. 



Rep. Geol. Expl. 40th Parallel, vol. iv, part ii, p. 293, pi. vii, fig. 22. Mus. No. 

 12537. 



Unio nucalis M. & H. 



Pal. Upper Missouri, <^Smithsouian Cont. to Know. 172, p. 92, pi. iii, figs. 13a-c. 

 Rev. Non-Marine Foss. Moll., p. 20 or 426, pi. iii, fig. 4. Mus. No. 196. 



Unio stewardi White. 



Non-Marine Foss. Moll., p. 20 or 426, pi. iii, fig. 1. Mus. No. 8849. 



Valvata ? scabrida M. & H. 



Pal. Upper Missouri, <^Smithsouian Cont. to Know. 172, p. 113, pi. iv, figs. 2a, b. 

 Rev. Noa-Mariuo Fos.s. Moll., p. 64 or 470, pi. iii, fig. 7. Mus. No. 316. 



Volsella formosa M. & H. 



Pal. Upper Missouri, <Smithsouian Cont. to Know. 172, p. 86, figs. A, B, on p. 87. 

 Mus. No. 1882. 

 Volsella scalprum (Sow. sp.) var. isonema Meek. 



Rep. Geol. Expl. 40th Parallel, vol. iv, part i, p. 132, pi. xii, fig. 4. Mus. No. 12545. 



