HELIX, 97 



Helix fastigams, L. W. Say. — Shell rimately perforated, plane 

 above, inflated below, with fold-like strise above, smoother below, some- 

 what shining, of a russet horn-color, hirsute ; spire flattened ; whirls six 

 and a half, flattened, the last acutely carinated above, very 

 abruptly deflected at the aperture, scrobiculated, con- ^'S- ^''^' 

 stricted, convex below ; aperture very oblique, subreni- 

 form, very much contracted, tridentate ; within the base 

 of the last whirl is a small, detached, erect, rounded 

 tubercle ; peristome white, reflected, its terminations 

 joined by a stout, subtriangular, excavated, deeply enter- 

 ing tooth, the right hand margin with a stout, deeply-seated 

 tooth, the columellar margin with a submarginal, smaller 

 tooth. Greater diam. 10, lesser 9 ; height about 4 mill. 



Poli/gijra fatigiata, Say, N. Harm. Diss. II, 229 (1829) ; 



ed. BiNNEY, 37. rr,- . ,■ 



' Helix fastigans. 



Helix fattgiata, Binney in Bost. Journ. Nat. Hist. Ill, 388 



(1840), ex parte (excl. syn. et fig.) ; Terr. Moll. II, 193 (pars), pi. 



xxxix, f. 4 (excl. syn.).— Shuttlewokth, Bern. Mitt. 1852, 197. — 



Bland, N. Y. Lye. VI, 283, pi. ix, f. 17-20 (1858).— W, G. Bisney, 



Terr. Moll. IV, 82.— Pfeiffek, Mon. Hel. Viv. IV, 31S. 



Eelix iexasiana, S, Pfeiffer, Mon. Hel. Viv. I, 418 ; III, 267 ; in Chem- 

 nitz, ed. 2, I, 86, excl. descr., syn., et fig.— Desoayes in Fee. I, 74, 

 excl. descr., syn., et fig. 



Helix dorfeuilliana, Deshayes in Per. I, 73 (excl. syn.), pi. Ixix, d, f. 3, 

 not of Lea. 



Helicina fastigiata, DeKay, N. Y. Moll. 82 (1843). 



Helix fastigans, L. W. Say MS. in Bland, Ann. N. Y. Lye. VII, 140. 



Dcedalochila fastigans, Teyon, Am. Journ. Conch. Ill, 67, pi. x, f. 22, 23, 

 26 (1867). 



Tennessee at Clarkeville and Nashville, 



E. fastigam is larger than troostiana, hazardi, and dorfeuilli- 

 ana ; it is most nearly allied to the first, and though it is con- 

 nected with the second, is wholly distinct from the last. The 

 parietal tooth is more rectangular than that of troostiana, in 

 which it is slightly eraarginate near the tip — but much more so 

 in hazardi, while the parietal tooth in dorfeuilliana is rather 

 quadrate. The teeth on the peristome in fastigans and troostiana 

 are much alike, as regards form, size, and position — the superior 

 one being the largest — both are larger and transverse in dorfeuilli- 

 ana and in hazardi, the inferior one being the largest in the latter. 

 Behind the peristome there are two small pits, showing the situa- 

 tion of the teeth in fastigans and troostiana, while there is 

 scarcely more than a deep, well-marked constriction in dorfeuilli- 



7 August, 1868. 



