HELIX. 117 



HELIX ELECTRINA GOULD vol. ii. p. 236, pi. xxix. fig. 1. 



Pfeiffer (Symb. ii. 10) considers this a variety of nitidosa, 

 but subsequently refers it to pura, as does also Reeve. 

 It has also been detected in Georgia and New York. 



HELIX OTTONIS PFEIFFER vol. ii. p. 238, pi. xxix. a, fig. 3. 



Also considered a synonym of arborea by Reeve, (No. 

 733.) See the remarks under H. arborea. 



HELIX STEE1VSTRUPII MORCH. 



In Morch's catalogue of Greenland Mollusca (Rink's 

 Greenland, p. 75) occurs the following mention of this 

 species, which is the only information I can obtain in 

 regard to it. (See also H. Fabricii.) 



Helicella Steenstrupii, N. s. 

 Helicella sp. Stp. Conch, von Island. 

 Helix nitida Fabr. F. Gr. No. 385. 

 Helix alliaria Forbes, Br. Ass. 1839, 142. 



HELIX CAPSELLA GOULD vol. ii. p. 239, pi. xxix. a, fig. 1. 



Helix rotula PFEIFFER, Mon. Hel. Viv. iii. 107. 

 Helix placentula SHUTTLE WORTH, (Zonites) Bern. Mit. 1852, 194. 

 GOULD, iu Terr. Moll. iii. 19. 



My opinion regarding the identity of placentula is 

 founded on the description alone, not having seen any 

 authentic specimen. 



HELIX VORTEX PFEIFFER... .vol. ii. p. 240, pi. xxix. a, fig. 2, vol. iii. p. 34. 



Helix vortex PFEIFFER, Ar. f. Mat. 1839, ii. 351; Mon. Hel. Viv. i. 95; iii. 88. 



CHEMNITZ, ed. 2, ii. 110, pi. Ixxxviii. figs. 7-9. 



REEVE, Con. Icon. No. 644, (1852). 



GOULD, vol. iii. 1. c. 

 Helix selenina REEVE, 1. c. 716, (1852). 



I have seen no specimens from America of the larger 

 variety of the species found in the West Indies. 



