smaller umbilicus, more rounded and larger aperture, and more ventricose bodj 

 whorl; its color is also lighter. The revolving lines are present in four out of 

 six specimens before me. 



Reeve's fig Con. Icon , No. 072, has some resemblance to it in shape, though 

 less globose — but differs in being striate above. 



In the collection of the Academy. 



Helix friabilis. Testa globosa, papyracea, friabilis, subdiaphana, nitens, 

 rufescens ; spira parvula, elevato-conica ; anfr. quatuor, Iteviter corrugati, con- 

 vexi, ultimus permagnus, ventricosissimus ; sutura niediocris ; apertura circu- 

 laris, parum alta et longa, intus livida, callo levi albo sub-incrassata ; perist. 

 acutum, tenue, simplex, ad basin reflexiusculum, violaceum, umbilicum parvum 

 et profundum aliquantum tegens. Diam. maj. 26; min. 20; alt. 13 mill. 



Habitat in ripis fluminis Wabash, (Mrs. Say !) In Illinois (R. Kennicott!) 



Species rara, ad sectionem H.fuliffinosce, Binnej', referenda, sed testa papj ra- 

 ced et rotundata, spira elevata, et apertura circular! distincta. 



Shell very globose, transparent, brittle, thin, shining, reddish ; spire very 

 short, conic; whorls four, convex, lightly wrinkled, rapidl}'- increasing, the last 

 very large and ventricose ; suture moderate; aperture circular, equally high and 

 broad, within bluish and slightly thickened by a very thin white callus; perist. 

 simple, sharp, thin, at its junction with the body whorl, violet colored and 

 reflected, so as to cover a portion of the small and deep umbilicus; the parietal 

 wall of the aperture is covered with a light violet colored callus. 



Belongs to the same group as E. fulic/inosa, Binney — but readily distinguished 

 from that and all described species by its transparent, globular shell, ventricose 

 bodj-whorl, and circular aperture. At the localities where it was found by 

 Mr. Kennicott, H. fuliginosa was not noticed. 



There is a shell received from Texas, by Dr. Newcomb, which may prove to 

 be identical with this. 



In the collection of the Academy. 



Helix redimita. Testa globoso-conica imperforata, tenuiscula, minute et 

 confertim granulata, corrugata, rufo-brunnea; apex laevigata, obtusula, spira 

 elevata; anfr. 6 convexi, sutura impressa distincti, ultimus permagnus, infiatus, 

 ad aperturam descendens, supra medium fascia fusca rediniitus ; apertura 

 perobliqua, transverso-orbicularis, intus unifasciata ; perist. simplex, rufocine- 

 reum, incrassatulum,marginibus valde approximatis, basali reflexiusculo, callo 

 albo umbilicum tegente. Diam. maj. 21; min. 17; alt. 12 mill. 



Syn. Helix Nickliniana, Binney, Terr. Moll. iii. pi. vi, f. 1, excepta icone in 

 medio posita. 



Habitat in California aut in Oregon ? 



Shell globose-conic, imperforate, rather thin, wrinkled, covered with minute 

 and crowded granulations; color reddish brown; apex free from granules, 

 rather blunt; spire elevated; suture impressed; whorls six, convex, the last 

 quite large and rounded, falling towards the aperture, and banded with reddish 

 brown above the middle; aperture rather large in proportion to the size of the 

 shell, very oblique, transversely rounded, within showing the band; peristome 

 simple, reddish ash color, thickened, reflected slightly at the base, ends 

 approached; umbilicus entirely covered with a white callus. 



This shell is figured by my father as a var. of H. JSFickliniana^ Lea. A refer- 

 ence to Mr. Lea's figure and description will at once show it to be distinct, 

 according to the present notions of specific weight. Dr. Gould refers it (Terr. 

 Moll. iii. p. 26) to H. Californiensis ; Reeve, Con. Icon. 661. It appears, how- 

 ever, to be distinct from the shell there figured. 



In general outline it resembles H. Kellettii, Forbes, Proc. Zool. Soc, London, 

 1850, pi. ix, f. 2, as well as Reeve's fig. 665 6, not 665 a. Con. Icon. The resem- 

 blance will be found, however, to cease with the outline, on a comparison of 

 the two shells. H. Kellettii is sometimes perforate, is differently colored, and 

 belongs rather to the group of California Helices represented by H. areolata. 

 1857.] 



