256 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Helix corrugata, Budgin, is quoted by the same (p. 42) as a synonyme of Limncea 

 corrugata, and 



Helix viridata, Budgin, Virginia, is quoted by the same (p. 43) as a synonyme of 

 Paludina viridis, and 



Helix imperfecta, Budgin, is quoted by the same (p. ix. of Appendix) as a syno- 

 nyme of Melania inermis. 



Helix minuta, True (Proc. Essex Inst., II. Pt. 2, p. 193, Salem, Mass., I860).— 

 Shell minute, rounded conical, smooth, apex obtuse ; epidermis of a uniform 

 reddish horn-color ; whorls 4, rounded above and below, with a well-defined 

 suture ; aperture rounded, lip simple and thin, umbilicus broad and deep. Diam- 

 eter about one-twentieth inch. 



Helix peregrina (Bosc, Hist. Nat. des Coq., IV. 57, 1830). — Ovale, imperforee ; 

 les tours de spire ecartes, decroissants egalement, l'ouverture ovale. 



Schwet. Einl. in Conch., II. Tab. IV. Fig. 11. Se trouve dans les iles de la 

 cote ouest de l'Amerique. (Bosc). 



Helix Rowelli, Newcomb (see L. k Fr.-W. Sh., I. 185), has been accredited to 

 Arizona, but not on undoubted authority. I have not included here the Lower 

 California species, for which see pp. 20, 21. 



Helix radiata, Lister (Europe and Virginia), of Bosc, Hist., IV. 32, appears to 

 be H. altcrnata, as reference is given to Lister's figure of that species. 



Helix trivolvis, Eaton (Zool. Text-Book, p. 194) = Planorbis. 



Helix bicarinatus (id. 194) = Planorbis. 



Helix parvus (id. 195) = Planorbis. 



Helix catascopius (id. 195) = Limncea. 



Helix htterostrophus (id. 195) = Physa. 



Helix subcarinatus (id. 195) = lAoplax. 



Helix Virginica (id. 195) = Melania. 



Helix vivipara (id. 196) = Vivipara contectoides. 



Helix decisa (id. 196) = Melantho. 



Helix Cumberlandicus, Lea, of Wheatley's Cat. II. S. p. 18, is the same, I pre- 

 sume, as Patula Cumberlandiana. 



Helix immitissima, Lea, of the same, p. 19 = H. minutissima ? 



Helix pallida, Say, of same = H. palliata ? 



Helix depicta, Grateloup, Soc. Lin. Bordeaux, XI. 399, PI. I. Fig. 12(1839). — 

 Shell subglobose, conic, imperforate, thin, white, very delicately striate, orna- 

 mented with varied lines and interrupted bands ; lip simple, acute. 



This pretty shell has some points of resemblance with Helix pisana, 'Mull., 

 but is smaller and not umbilicated. The internal edge of the right lip is white 

 instead of rose. The upper surface is covered with numerous yellowish-brown 

 bands, more or less deep, interrupted by oblique lines of same color. Five 

 whorls. Height, 11 mill.; diameter, 15 mill. 



Island of St. Thomas ; New Orleans. (See L. & Fr.-V T . Sh. I. p. 187, Fig. 327.) 



Helix Pisana, MuLLER, United States. — Ferussac, Tabl. Syst. 119. — Gkay, 

 Turton's Manual. Forces, Brit. Ass. Rep., 1840, 145. See Bost. Journ., 

 III. 4S9. This species is not known to exist in America at the present day 

 (1878). 



