THE PACIFIC COAST. 15 



HELIX INFUMATA GOULD vol. iii. p. 13, pi. Ixxix. fig. 2. 



Helix infumata W. G. BINNEY, Pac. E. R. Rep. vi. p. 112. 



HELIX TOWNSENDIANA LEA vol. ii. p. 161, pi. xix. 



Helix Town&endiana TROSCHEL, Arch, fiir Nat. 1839, ii. 221. 



CHEMNITZ, ed. 2, i. 323, pi. Ivii. fig. 10, 11 (1846). 



REEVE, Con. Icon. 625 (1852). 



PFEIFFER, 1. c. iii. 229. 



GOULD, U. S. Ex. Ex. Moll. 67, fig. 36. 



HELIX ARROSA GOULD vol. iii. p. 12, pi. Ixxvi. fig. 4. 



Helix ceruginosa GOULD, 1. c. 



W. G. BINNEY, Pac. R. R. Rep. vi. p. 113. 

 Helix arrosa GOULD in litt. 



W. G. BINNEY, Notes, p. 5. 



This name is proposed by Gould in place of ceruginosa^ 

 that being preoccupied. 



HELIX DUPETITHOUARSI DESHAYES. . .vol. iii. p. 14, pi. Ixxvi. fig. 9. 



Helix Dupetithouarsi DESHAYES, in Fer. i. 169, pi. xcvii. fig. 8-10. 



REEVE, Con. Icon. 659 (1852). 

 PFEIFFER, 1. c. Excl. var. B.; iii. 229. 

 W. G. BINNEY, P. R. R. Rep. vi. p. 114. 

 Helix Oregonensis TROSCHEL, Arch, fiir Nat. 1839, ii. 221. 

 DEKAY, N. Y. Moll. 46. 

 PFEIFFER, 1. c. iii. 272. 



In the collection of the Smithsonian Institute there are 

 specimens of this shell which are furnished with a delicate 

 greenish-yellow epidermis. As this has never been noticed 

 in descriptions, I believe it must exist only on very fresh 

 specimens, which are rarely seen. On being immersed 

 some minutes in water, the epidermis becomes of a bright 

 golden color. 



The figure is a fac simile of that of Deshayes. 



HELIX MORMONUM PFEIFFER. 

 PLATE LXXIX. FIGURE 21. 



T. umbilicata, depressa, tenuiscula, arcuato-striatula, pallide rufes- 

 cens ; spira vix conoideo-elevata ; anfr. 6, vix convexiusculi, lente ac- 



