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GEOLOGICAL SURVEY

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BOYLE.] NORTH AMERICAN MES020IC INVERTEBRATA. 283<br />

Thetis (Sby.) Gabb. (1869.)<br />

Geol. Sur. Gal. Faleont., vol. 2, p. 186. Phila.,<br />

1809. W. M. Gabb.<br />

affinis iiom. prov. Whiteaves.<br />

(1884.)<br />

Geol. and Nat. Hist. Sur. Can. Mes. Foss., vol. 1,<br />

pt. 3, pp. 226, 227, pi. 30, figs. 4, 4a, b. Montreal,<br />

1884. J. F. Whiteaves.<br />

Formation: Cretaceous.<br />

Location: Bear Skin bay, Skidegate inlet.<br />

? circularis (M.&H.) Meek. (18760<br />

Kep. U. S. Geol. Sur. Terr., vol. 9, pp. 190, 191,<br />

pi. IT, figs. 8a-c. Wash., 1876. F. B. Meek.<br />

Formation: Cretaceous.<br />

Location: Near Black hills, on Choyeune river;<br />

also near the mouth of Milk river, on the Missouri.<br />

? circularis (M. & H.) White.<br />

(1879.)<br />

Eleventh Ann. Kep. U. S. Geol. and Geogr. Sur.<br />

'Terr., p. 206. Wash., 1879. C. A. White.<br />

Formation: Cretaceous.<br />

Location: Sage creek, Colo.<br />

circularis (M'. & H.) Whitfield.<br />

(1880.)<br />

Rep. Geol. Black Hills of Dak., p. 417, pi. 11, figs.<br />

22-24. Wash., 1880. &. P. Whitfield.<br />

Formation: Cretaceous.<br />

Location: Near the forks of the Cheyenne river,<br />

and near the mouth of Rapid creek, Black hills,<br />

Dak.<br />

? elongata n. s. Gabb. (1869.)<br />

Geol. Sur. Cal. Paleont., vol. 2, p. 186, pi. 30, figs.<br />

80,80a. Phila., 1869. W. M. Gabb.<br />

Formation: Cretaceous.<br />

Location: Vicinity of Cottonwoocl creek, Cal.<br />

Thracia (Leach) M. & H. (1865.)<br />

Paleont. Up. Missouri, Sinithson. Cout. Knowl.,<br />

vol. 14, No. 172, pp. 101, 102. Wash., 18G5.<br />

Meek & Hay den.<br />

? arcuata n. s. M. & H. (1860.)<br />

Proc. Acad. Nat. Sci., Phila., for 1860, p. 182.<br />

Phila., 1861. Meek & Hayden.<br />

Formation: Jurassic.<br />

Location: Southwest base of Black hills, Nebr. [S.<br />

Dak.]<br />

? arcuata M. & H. (1865.)<br />

Paleont. Up. Missouri, Smithson. Cont. Knowl.,<br />

vol. 14, No. 172, p. 102, pi. 4, fig. 8. Wash.,<br />

1865. Meek & Haydea.<br />

Formation: Jurassic.<br />

Location: Southwest base of the Black hills.<br />

gracilis (M. & H.) Meek. (1876.)<br />

Rep. U. S. Geol. Sur. Terr., vol. 9, pp. 224, 226,<br />

pi. 39, figs. 6a, b. Wash., 1876. F. B. Meek.<br />

Formation: Cretaceous.<br />

Location: Mouth of Judith river, Idaho Ter., on<br />

the Missouri.<br />

? occidentals n. s. Meek. (1858.)<br />

Trans. Albany Inst., vol. 4, pp. 43, 44.<br />

1858-1864. F. B. Meek.<br />

Formation: Cretaceous.<br />

Location: Nanaimo, Vancouver island.<br />

Albany,<br />

Thracia C on tinued.<br />

? occidentalis Meek. (1876.)<br />

Bull. U. S. Geol. and Geogr. Sur. Terr, vol. 2, No.<br />

4, p. 363, pi. 2, figs. 3, 3a. Wash., 1870. F. B.<br />

Meek.<br />

Formation: Cretaceous.<br />

Location: Nanaimo, Vancouver island.<br />

myaeformis n. e. White. (1879.)<br />

Proc. U. S. Nat. Mus., vol. 2, pt. 2, pp. 297, 298,<br />

pi. G, figs. 1, 2. Wash., 1880. Smithson. Misc.<br />

Coll., vol. 19. Wash., 1880. C. A. White.<br />

Formation: Cretaceous.<br />

Location: Bell county, Tex.<br />

myaeformis White. (1880.)<br />

Twelfth Ann. Rep. U. S. Geol. and Geogr. Sur.<br />

Terr., pt. 1, p. 23, pi. 17, figs. 2a, 6. Wash.,<br />

1880. C. A. White. '<br />

Formation: Cretaceous.<br />

Location: Bell county, Tex.<br />

? prouti (M. & H.) Meek. (1876.)<br />

Rep. U. S. Geol. Sur. Terr., vol. 9, pp. 225,226, pi.<br />

37, figs. 6a, 6. Wash., 1876. F. B. Meek.<br />

Formation: Cretaceous.<br />

Location: Mouth of Judith river, Idaho Ter., on<br />

the Missouri.<br />

semiplanatan.s. Whiteaves. (1884.)<br />

Geol. and Nat. Hist. Sur. Can. Mes. Foss., vol. 1,<br />

pt. 3, pp. 221, 222, pi. 29, figs. 5, 5a-c. Montreal,<br />

1884. J. F. Whiteaves.<br />

Formation: Cretaceous,<br />

Location: South side of Alliford bay; Bear Skin<br />

bay, Skidegate inlet; South island.<br />

subgracilis n. s. Whitfield. (1877.)<br />

U. S. Geogr. and Geol. Sur. Rocky Mt. Region;<br />

Prelim. Rep. Paleont. Black Hills, p. 36. Wash.,<br />

1877. R. P. Whitfield.<br />

Formation: Cretaceous.<br />

Location: Near French creek, on Cheyenne river,<br />

Dak.<br />

subgracilis Whitfleld. (1880.)<br />

Rep. Geol. Black Hills of Dak., pp. 419,420, pi. 11,<br />

figs. 29,30. Wash., 1880. R. P. Whitfield.<br />

Formation: Cretaceous.<br />

Location: Near French creek, on the Choyeune<br />

river, Black hills, Dak.<br />

? sublevis n. s. M. & H. (1860.)<br />

Proc. Acad. Nat. Sci., Phila., for 1800, p. 182.<br />

Phila., 1861.<br />

Meek & Hayden.<br />

Formation: Jurassic.<br />

Location: Southwest base of Black hills, Nebr. [S.<br />

Dak.]<br />

? subleevis M. & H. (1865.)<br />

Paleont. Up. Missouri, Smithson. Cont. Knowl.,<br />

vol. 14, No. 172, p. 102, pi. 4, figs. 4, '4a. Wash.,<br />

1865. Meek & Haydeu.<br />

Formation: Jurassic.<br />

Location: Southwest base of the Black hills.<br />

? sublevis (M. & H.) Whitfield.<br />

(1880.)<br />

Rep. Geol. Black Hills of Dak., p. 375, pi. 6,<br />

fig. 34. Wash., 1880. R. P. Whitfield.<br />

Formation: Jurassic.<br />

Location: Redwater valley, Black, hills,

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