84 PALEONTOLOGY OF NEW YORK. 



1866. Athsfris, Mrm and Worthk!*. Geol. Survey of Illinois, vol. ii, ji. 254, pi. xviii, fig. 8. 



1866. AthyrU, Obihitz. Carbon und Dyas in Nebraska, pp. 40, 42, pi. iii, fi(f8. 7-9. 

 t 1866. Athyrix, BiLLlsas. Catalogue Silurian Fossils of Anticosli, pp. 47, 48. 



1867. /4ttyri», Hall. Twentieth Kept. N. Y. SUte Cab. Nat. Hist., pp. 152, 3fi8. 



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



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



1868. Aihyri* f McChbssby. Trans. Chicago Acad. Science, vol. i, p. 33, pi. vi, fig. 4. 



1869. Spir'igera {Athyris), Todla. Sitaungsb. der kais. Akad. der Wissensch., vol. lix, p. 6, pi. i, 



fig. 5. 

 1871. AthyrU, Mkbk. Hayden's U. 8. Qeol. Survey of Nebraska, p. 180, pi. i, fig. 12; pi. v, fig. 8 ; 

 pi. viii, fig. 4. 



1873. Athyris, Mkkk and Wokthbk. Qeol. Survey of Illinois, vol. v, p. 570, pi. xxv, fig. 14. 



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



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



1875. AthyrU, Mbkk. Palieonlology of Ohio, vol. ii, p. 283, pi. xiv, fig. 6. 



1876. Spiriymi, Whitk. Wheeler's Expl. and Survey West of the 100th Meridian, vol. iv, pp. 91, 92, 



141 ; pi. V, figs. 11, 12 ; pi. x, figs. 5, 6. 

 1876. AthyrU, Mkkk. Bull. U. S. Geol. Survey of the Terr., vol. ii, pi. i, fig. 2. 

 1876. AthyrU, Dkrbt. Bull. Mus. Comparative Geology, vol. iii, p. 279. 



1876. AthyrU, Mkkk. Simpson's Kept. Expl. Great Basin of the Terr, of Utah, p. 350, pi. ii, 



fig. 4. 



1877. AtliyrU, Hall and Wbitfibld. 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. AthyrU. Mbbk. King's U. S. Geol. Expl. 40th Parallel, vol. iv, pp. 81-83, pi. viii, fig. 6 ; pi. ix, 



figs. 3, 4. 



1878. AthyrU, Dawsom. Acadian Geology, thii'd ed., p. 290, fig. 88. 



1880. Athyris, Whitb. Second Ann. Rept. Indiana Bureau of Statistics and Geology, p. 502, pi. iv, 



figs. 8, 9. 



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



1882. Athyris, Whitfiblp. Bulletin American Museum of Natural Histoi-y, vol. i, pp. 49, 50, \t\. vi, 



figs. 18-27. 



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



figs. 18-27. 



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

 1884. AthyrU, Walcott. Monogi-. U. S. Geol. Survey, vol. viii, pp. 148, 222, pi. xviii, fig. 6. 

 1884. AthyrU, Wortkbn. Bull. Illinois State Mus. Nat. Hist., p. 24. 



1887. AthyrU, Hbrrick. Bull. Denison Univereity, vol. ii, p. 44, pi. ii, fig. 23. 



1888. AthyrU, Kbyks. Proc. Acad. Nat. Sci. Philadelphia, p. 10. 



1888. AthyrU, Hbrrick. Bull. Denison Univereity, vol. iii, p. 49, pi. ii, figs. 1,7; vol. iv, pp. 14, 24, 



pi. iii, fig. 6. 



1889. AthyrU Nbttblroth. Kentucky Fossil Shells, p. 87, pi. xvi, figs. 25-32. 



1890. AthyrU, Worthkji. Geol. Survey of Illinois, vol. viii, p. 103, pi. xi, fig. 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. 



