84 PALEONTOLOGY OF NEW YORK. 



1866. Afhyris, Meek and Worthen. Geol. Survey of Illinois, vol. ii, p. 2.')4, pi. xviii, fig. 8. 



1866. Athyrls, Gbinitz. Carbon und Dyas in Nebraska, pp. 40, 42, pi. iii, 6^s. 7-9. 

 ? 1866. Athyris, Billings. Catalogue Silurian Fossils of Antioosti, pp. 47, 48. 



1867. Athyris, Hall. Twentieth Kept. N. Y. State Cab. Nat. Hist., pp. 152, 2.^8. 



1867. Athyris, Hall. Paleontology of N. Y., vol. iv, pp. 282-293, pis. xlvi, xlvii, figs. 1-33. 



1867. Athyris, Hall. American Journal Science, vol. xliv, p. 48. 



1868. Athyris ? McChesney. Trans. Chicago Acad. Science, vol. i, p. 33, pi. vi, tig. 4. 



1869. Spirigera (Athyris), Toula. Sitzungsb. dei- kais. Akad. der Wissensch., vol. Hx, p. 6, pi. i, 



fig. .-;. 

 1871. Athyris, Meek. Haydens U. S. Geol. Survey of Nebraska, p. 180, pi. i, fig. 12; pi. v, fig. 8 ; 

 pi. viii, fig. 4. 



1873. Athyris, Meek and Wouthen. Geol. Survey of Illinois, vol. v, p. 570, pi. xxv, tig. 14. 



1874. Athyris, Derby. Bulletin Cornell University, vol. i, pp. 7, 10, pi. i, fig. 6, 8; pi. ii, figs. 9-12 ; 



pi. iii, figs. 8, 15-21, 29 ; pi. vi, figs. 2, 16 ; pi. ix, figs. 4-6. 



1875. AUiyris, Mekk. Palajontology of Ohio, vol. ii, p. 283, pi. xiv, fig. 6. 



1875. Spirigera, '^MYrs. Wheeler's Expl. and Survey "West of the 100th Meridian, vol. iv, pp. 91, 92, 



141 ; pi. V, figs. 11, II ; pi. x, figs. 5, 6. 

 1S76. Athyris, Meek. Bull. U. S. Geol. Survey of the Ten-., vol. ii, pi. i, fig. 2. 



1876. Athyris, Derby. Bull. Mus. Comparative Geology, vol. iii, p. 279. 



1876. Athyris, Meek. Simpson's Rei>t. Expl. Great Basin of the Terr, of Utah, y. 350, pi. ii, 



fig. 4. 



1877. Athyris. Hall and Whitfield. King's U. S. Geol. Expl. 40th Parallel, vol. iv, pp. 256, 257. 271, 



pi. iv, figs. 10, 11, 15-17; pi. v, figs. 19, 20. 



1877. Athyris, Meek. King's U. S. Geol. Expl. 40th Parallel, vol. iv, pp. 81-83, pi. viii, fig. 6 ; pi. ix, 



figs. 3, 4. 



1878. Athyris, Dawson. Acadian Geology, third ed., p. 290, fig. 88. 



1880. Athyr'cs, White. Second Ann. Rept. Indiana Bureau of Statistics and Geology, p. 502, pi. iv, 



figs. 8, 9. 



1881. Athyris, White. Tenth Rept. State Geologist Indiana, p, 134, pi. iv, figs. 8, 9. 



1882. Athyris, Whitfielp. Bulletin Ameiican Museum of Natural History, vol. i, pp. 49, 50, pi. vi, 



figs. 18-27. 



1883. Athyris, Hall. Twelfth Report of the State Geologist of Indiana, pp. 328, 329, pi. xxix, 



figs. 18-27. 



1884. Athyris, White. Thirteenth Rept State Geologist Indiana, p. 136, pi. xxxv, figs. 6-9. 

 1884. Athyris, Walcott. Moiiogr. U. S. Geol. Survey, vol. viii, pp. 148, 222, pi. xviii. fig. 5. 

 1884. Athyris, Worthen. Bull. Illinois State Mus. Nat. Hist., p. 24. 



1887. Athyris, Herrick. Bull. Denison University, vol. ii, p. 44, pi. ii, fig. 23. 



1888. Athyris, Kbyes. Proc. Acad. Nat. Sci. Philadelphia, p. 10. 



1888. Athyris, Herrick. Bull. Denison University, vol. iii, p. 49, pi. ii, figs. 1, 7; vol. iv, pp. 14, 24, 



pi. iii, fig. 6. 



1889. Athyris Nettelrotu. Kentucky Fossil Shells, p. 87, pi. xvi, figs. 25-32. 



1890. Athyris, Worthen. Geol. Survey of Illinois, vol. viii, p. 103, pi. xi, tig. 2. 



" General Characteristics. — Nearly orbicular, small; no cardinal area or hinge- 

 line; spiral appendages very large, filling the greater part of the shell." — McCoy, 

 op. cit., p. 146. 



Diagnosis. Shells subequally biconvex ; outline transversely elliptical, sub- 

 circular or elongate-subovate ; surface medially sinuate. 



