HELIX. 109 



Helix fehigeri, Bland, Am. Journ. Conch. II, 373, pi. xxi, f. 10 (1866). 

 Polygyra febigeri, Teyon, Am. Journ. Conch. Ill, 160, pi. x, f. 30, 33 

 (1867). 



New Orleans. 



This species certainly differs from II. cereolus, Mulil., H. sep- 

 temvolva, Say, H. volvoxis, Parr., and H. carpenteriana, Bid., 

 the four species of the same group hitherto found on the North 

 American continent. Compared with H. p)aludosa, Pfr., of Cuba, 

 the rib-like striffi are more regular and prominent, it is more de- 

 cidedly angular at the peripher}', and the form and armature of 

 the aperture are different. In H. febigeri there is no such exca- 

 vation below the angle of the periphery as prevails, more or less, 

 in the other above-named continental species. In this respect, 

 and in the form of the aperture, H. febigeri appears to be most 

 nearly allied to E. microdonta, Desh., of Bermuda and New 

 Providence, but it is more coarsely striated, and the last whirl 

 is more inflated below. 



Helix pustula, Fer.— Shell umhilicated, orhicularly depressed, 

 minutely striated, reddish or pale horn-color, hirsute ; spire scarcely 

 elevated ; whirls four and a half, flattened, gradually increasing, the last 

 more convex helow, deflected at the aperture, constricted 

 ^behind the peristome ; umbilicus broad, pervious, with a Fig. 185. 

 deep groove marked within the shell by an internal, re- 

 volving ridge-like lamella, branching from a stout trans- 

 verse, internal tubercle ; aperture very oblique, narrow, 

 sinuously lunate ; peristome sinuous, white, thickened, 

 acute, somewhat reflected, its terminations joined by a 

 two-forked, elevated, acutely-pointed lamina, the basal 

 margin with two approximated acute denticles, the colu- 

 mellar termination entering and somewhat covering the 

 umbilicus. Greater diam. 5, lesser 4 ; height 2^ mill. * i^pus 



Helix pustula, Ferussac, Hist. pi. 1, f. 1. — Deshayes in Fee. I, 78, t. 1, f. 



1.— Pfeiffer, Symb. Ill, 81; Mon. I, 422; IV, 268, excl. B; in 



Chemnitz, ed. 2, I, 376, pi. Ixv, f. 18-20 (1846).— Reeve, Con. Icon. 



721 (1852).— Bland, Ann. N. Y. Lye. VI, 346, f. 1 (1858).— W. G. 



BiNNEY, Terr. Moll. IV, 94, pi. Ixxvii, f. 12.— Not of Binney. 

 Dadalochila pustula, Tryon, Am. Journ. Conch. Ill, 62, pl. x, f. 6, 17 



(1867). 



South Carolina, Georgia, Florida, Texas. 

 The groove within the umbilicus is a very marked feature in 

 Ferussac's species, and though not referred to in his description, 



