HELIX. 



427 



oblique striae ; suture impressed ; aperture lunately 

 sub-circular, not dilated ; peristome white, narrow, 

 thickened, reflected, with a slightly projecting 

 tooth on the inner edge of the basal portion near 

 the umbilicus ; parietal wall with a sub-prominent, 

 white tooth ; umbilicus open, deep, not wide, ex- 

 hibiting all the volutions, slightly contracted by 

 the reflected peristome ; base rounded with the 

 striae distinct, converging into the umbilicus. 

 Greater diameter twenty-seven, lesser twenty- 

 three, height seventeen millimetres. 



From Canada East to Michigan and Maryland. 



Fig. 684. 



Helix? harpa. 



Shell ovately-conic, light horn color ; Avhorls four, convex ; aperture lunately 

 oval ; peristome simple ; sub-perforate. 



Helix? harpa, Say, Long's Exped. ii. 256, pi. 15, fig. 1 (1824) ; Binnet's ed. 29, pi. 74, 



fig. 1. 

 Pupa costulaia, Mighels, Pror. Bost. Soc. Nat. Hist. i. 187 (1844). 

 Bulimtis harpa, Pfeiffer, Zcitschr. fiir Malak. 1847, 147; Mon. Hcl Viv. ii. 150; in 



Chemxitz, 2d ed. No. .305, pi. 60, figs. 17 - 19. — Keeve, Con. Ii'on. No. 596 (1849). 



— BiNNEY, Terr. Moll. ii. 290, pi. 52, fig. 3. — W. G. Binney, Terr. Moll. iv. 



135. 

 Zoogenites harpa, Morse, .Joiirii. Portl. Soc. i. 32, pi. 1, figs. 1 -14 (1864) ; Am. Nat. i. 



60S, figs. 50, 51 (18G8}. 



Fig. 685. 



Shell sub-perforate, ovately conic, transparent, very thin, with 

 coarse, irregular lines of growth, pellucid, light horn 

 color ; spire conical, rather oljtuse ; whorls four, con- 

 vex, the upper ones smooth, the last two with promi- 

 nent, distant, thin, colorless, fold-like ribs, slightly in- 

 clined backwards, the last whorl rounded, somewhat 

 longer than the spire ; columella sub-receding ; aperture 

 lunately oval ; peristome simple, straight, the columel- 

 lar termination briefly reflected above. Greater diam- 

 eter, two mill. ; length, three and a half mill. ; aperture one and 

 two thirds long, one and one fourth millimetres wide. 



Gaspe, Maine, New Hampshire. Originally found by Say on the 

 Expedition to St. Peter's River, &c. Also in British limerica and 

 Sweden (Mai. Blat. 1867, p. 200). 



Animal small compared to the size of the shell, body and head 

 slate color, eye-peduncles darker, short, thick, bulbous ; eyes large, 



H. ? hnrpn. 

 Enlarged. 



