70 Binney on Terrestrial Mollusks. 



HELIX PROFUNDA Say vol. ii. p. 177, pi. xxii. 



Helix pfrofunda Say, (Binney's ed.) pp. 20, 36, pi. 37, fig. 3. 



DkKay, X. Y. Moll. p. 42, pi. iii. fig. 38. 



Che.mnitz, c(1. 2, ii. p. 63. 



Pfeiffek, 1. c. iii. 265. 



CiiF.NU, Hibl. Couch, iii. 51, pi. xiii. fig. 26. 



Dkshayes in P'er. i. 69. 



Reeve, Con. Icon. No. 682, (1852). 



Mks. Gray, Fig. Moll. An. pi. cxciii. fig. 12. (Ex. Bost. Journ.) 

 Ildix Jikhardi Deshayes in Lam. 3d ed. iii. 283. 



Chenu, 111. Con. xii. 13. 



Delessert, Rec. des Coq. pi. xxvi. fig. 7. 

 Polygyra jirofundum Adasis, Gen. Rec. Moll. ii. 207, (absq. desc.)V 



The shell figured in Ferussac, pi. 69 G, figs. 9, 11, and 

 referred to as var. /3 by Pfeiffer, is merely one of the many 

 varieties of the species, 



I have a specimen collected by Mr. T. A. Conrad on 

 Broad Top Mountain, Pennsylvania. It occurs fossil in 

 the Postpleiocene. 



HELIX SAYII Binney vol. ii. p. 180, pi. xxiii. 



Helix Sayii, Chemnitz, ed. 2, No. 976, tab. cxlviii. figs. 13, 14. 



Mrs. Gray, Fig. Moll. An. pi. 193, fig. 10. (Ex. Bost. Journ.) 



Deshayes in Fer. i. p. 79. 



Reeve, Con. Icon. No. 679, (1852). 

 Hdlx diudonta Say, (Binney's ed.) p. 39, pi. Ixxiv. fig. 4. 

 DeKay, N. Y. Moll. p. 34, pl. ii. fig. 18. 



I have it also from Pennsylvania. 



HELIX TRIDENTATA Say vol. ii. p. 1S3, pl. xxvii. 



Helix Iridenlata Say, (Binnej''s ed.) p. 6, pl. ixx. fig. 1. 



DeKay, N. Y. Moll. p. 28. pl. ii. fig. 7. 



I'oTiEZ et MiciiAUD, Gal. p. 114. 



Mrs. Gray, Fig. Moll. An. pl. 291, fig. 3. (Ex. Bost. Journ.) 



Chemnitz, 1. c. i. 84. 



rFEIFEEK, 1. c. iii. 263. 



Deshayes in Lam. ed. 3, iii. 309, in Fer. 1. c. i. 72. 



Reeve, Con. Icon. No. 690, (18.02). 

 Triudopsis lunula RAFiNEsyuE, Kii. and Ace. p. 3. j 



1 propose to separate from tridentata Binney both fallax 

 and Hopetonensis. Their di.stinctive characters are suf- 



