HELIX. 



113 



shortly deflexed, tumid below ; spire somewhat elevated ; peri- 

 stome with a white, thickened margin, briefly reflexed above, 

 somewhat constricted in its basal portion, usually sinuous and 

 dentate, furnished with an internal transverse tubercle on the 

 floor of the base of the last whirl. 



Fig. 189. 



Helix spinosa, Lea. — Shell imperforate, lenticular, with the upper 

 surface much flatteued, acutely carinated ; epidermis dark chestnut color, 

 with minute, hair-like processes lying Hat upon the whirls in the direction 

 of their lines of growth, striate ; whirls six, of nearly uui- 

 form width, and decreasing very gradually from the aperture 

 to the spire ; suture distinct, slightly raised ; aperture very 

 narrow ; peristome yellowish-white, near its junction with 

 the body-whirl thickened, angulated, and slightly reflected, 

 with a median cleft ; parietal wall with a long, yellowish, 

 narrow, projecting tooth, extending from the umbilical axis 

 to the angle of the peristome, and parallel with its thickened 

 edge ; base convex, with the umbilical region slightly in- 

 dented ; witliin the shell, springing from the axis, is a trans- 

 verse, curved, white tubercle. Greatest diam. 14, lesser 13 ; 

 height 6 mill. 



Carocolla spinosa, Lea, Am. Phil. Trans. IV, 104, pi. xv, f. 35 ; Obs. I, 



114 (1834). 

 Helix spinosa, Binney, Bost. Journ. Nat. Hist. Ill, 3G7, pi. xi, f. 2 (1840) ; 



Terr. Moll. II, 153, pi. xliv, f. 1, excl. syn. — Pfeiffek, Mon. Hel. 



Viv. I, 421 ; in Chemnitz, ed. 2, I, 375, pi. Ixv, f. 



15-17 (1849).— DeKay, N. Y. MoU. 47, pi. v, f. 114 



(1843). — Reeve, Con. Icon. 685 (1852).— W. G. 



BiNKEY, Terr. Moll. IV, 65. 

 Stenotrema spinosa, Tkyon, Am. Journ. Conch. Ill, 58, pi. 



ix, f. 26, 28, 29 (1867). 



Uelix spinosa. 



190. 



Alabama, Georgia, Tennessee. 



Fig. 190 shows the internal tubercle. 



Helix S2>inosa. 



Helix labrosa. Bland. — Shell imperforate, lenticular, carinated, 



the carina somewhat obsolete behind the aperture, solid, with curved 



striae, dark-brown colored beneath the epidermis, epidermis thin, with 



prostrate hairs ; spire convex-conoid, obtuse ; whirls five and a half, rather 



Q August, 1888. 



