50 MOLLUSCA. 
licus is broader, deeper, and more shelving. The striation and colo- 
ration are also quite different. Dr. Pfeiffer has more recently pub- 
lished a different shell under the same name. 
Figures 48, 48 a, 48 0, three views of the shell. 
Hetix Fornicata (Gould). 
Testa parva, planorboidea, tenuis, dilute rufa, supra convexiuscula, infra 
concava, oblique ordinatim et confertim costato-striata : spira anfrac- 
tibus quatuor convexis, ultimo ad peripheriam rotundato ; sutura 
profunda: apertura transversa, rotundato-elliptica. 
Hehz fornicata, Goutp ; Proceed. Boston Soc. Nat. Hist., 11. 172. 
Sept. 1846. Expedition Shells, 21. Prrmrer; Monog. Helic., 1. 426. 
SHELL planorboid, depressed, slightly convex above, concave be- 
neath, and having a rather large, deep, sloping umbilicus, thin and 
fragile, pale rufous. Whorls four, shining, coarsely and obtusely rib- 
striate obliquely, the outer one rounded at the periphery; suture 
deeply impressed. Aperture nearly circular, somewhat transverse- 
elliptical, the lips united by enamel. 
Diameter one-fourth of an inch; axis one-tenth of an inch. 
Inhabits the island of Kauai, Sandwich Islands. 
A small, dome-shaped shell, marked like H. strzatella, Say, but more 
like H. indentata, Say, in the form of the spire. 
Figures 64, 64 a, 64 b, three views of the shell. 
HELIx RUBIGINOSA (Gould). 
Testa orlicularis, depressa, ferrugineo-cornea, fusco-tessellata, oblique 
costato-striata, late umbilicata: spira anfractibus sex arcté volutis ; 
sutura impressa : apertura subrecta, lunata ; labro simplici ; lamella 
unica secundum anfractum penultimum intro volvente. 
