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PALAEONTOLOGY OF NEW YORK. 
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Athyris, Meek and Worthen. Geol. Survey of Illinois, vol. ij. p. 254, j)l. xviii, fig. 8. 
Athyrifi, Geinitz. Carbon und Dyas in Nebraska, pp. 40, 42, pi. iii, figs. 7-9. 
Athyris, Billings. Catalogue Silurian Fossils of Anticosti, pp. 47, 48. 
Athyris, Hall. Twentieth Kept. N. Y. State Cab. Nat. Hist., pp. 152, 258. 
Athyris, Hall. Pateontology of N. Y., vol. iv, pp. 282-293, pis. xlvi, xlvii, figs. 1-33. 
Athyris, Hall. American Journal Science, vol. xliv, p. 48. 
Athyris ? McChesnby. Trans. Chicago Acad. Science, vol. i, p. 33, pi. vi, fig. 4. 
JSpirigera {Athyris), Toula. Sitzungsb. der kais. Akad. der Wissensch., vol. lix, p. 6, pi. i, 
fig. 5. 
Athyris, Meek. Hayden’s U. S. Geol. Survey of Nebraska, p. 180, pi. i, fig. 12; pi. v, fig. 8 ; 
pi. viii, fig. 4. 
Athyris, Meek and Worthbn. Geol. Survey of Illinois, vol. v, p. 570, pi. xxv, fig. 14. 
Athyris, Derby. Bulletin Cornell University, vol. i, 7, 10, jil. i, fig. 6, 8; pi. ii, figs. 9-12; 
jil. iii, figs. 8, 15-21, 29 ; jd. vi, figs. 2, 16 ; j)l. ix, figs. 4-6. 
Athyris, Meek. Palieontology of Ohio, vol. ii, ji. 283, id. xiv, fig. 6. 
Spirigera, yimTE. Wheeler’s Expl. and Survey West of the lOOth Meridian, vol. iv, jip. 91, 92, 
141; pi. V, figs. 11, 12; pi. x, figs. 5, 6. 
Athyris, Meek. Bull. U. S. Geol. Survey of the Terr., vol. ii, pi. i, fig. 2. 
Athyris, Derby. Bull. Mus. Comparative Geology, vol. iii, p. 279. 
Athyris, Meek. Simpson’s Kept. Expl. Great Basin of the Terr, of Utah, p. 350, pi. ii, 
fig. 4. ’ 
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. 
Athyris, Meek. King’s U. S. Geol. Expl. 40th Parallel, vol. iv, pp. 81-83, pi. viii, fig. 6 ; pi. ix, 
figs. 3, 4. 
Athyris, Dawson. Acadian Geology, third ed., p. 290, fig. 88. 
Athyris, White. Second Ann. Kept. Indiana Bureau of Statistics and Geology, p. 502, pi. iv, 
figs. 8, 9. 
Athyris, White. Tenth Kept. State Geologist Indiana, p. 134, pi. iv, figs. 8, 9. 
Athyris, Whitfield. Bulletin American Museum of Natural History, vol. i, pp. 49, 50, pi. vi, 
figs. 18-27. 
Athyris, Hall. Twelfth Report of the State Geologist of Indiana, pp. 328, 329, pi. xxix, 
figs. 18-27. 
Athyris, White. Thirteenth Kept State Geologist Indiana, p. 136, pi. xxxv, figs. 6-9. 
Athyris, Walcott. Monogr. U. S. Geol. Survey, vol. viii, pp. 148, 222, pi. xviii, fig. 5. 
Athyris, Worthbn. Bull. Illinois State Mus. Nat. Hist., p. 24. 
Athyris, Herrick. Bull. Denison University, vol. ii, p. 44, pi. ii, fig. 23. 
Athyris, Keyes. Proc. Acad. Nat. Sci. Philadelphia, p. 10. 
Athyris, Herrick. Bull. Denison University, vol. iii, p. 49, pi. ii, figs. 1,7; vol. iv, pp. 14, 24, 
pi. iii, fig. 6. 
Athyris Nettelroth. Kentucky Fossil Shells, p. 87, pi. xvi, figs. 25-32. 
Athyris, Worthen. Geol. Survey of Illinois, vol. viii, p. 103, pi. xi, fig. 2. 
“ General Characteristics .—Nearly orbicular, small; no cardinal area or binge- 
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. 
