344 naticidj:, 



Natica pusilla. 



Natica pusilla, Sat, Journ. Ac. Nat. Sc. Phila. ii. 2.57 (1822) ; 1st ed. Biknet, 87. — 

 Stimpson, Shells of New England, 43 ; Check Lists, 5 ; not of Gould, Inv. 1st ed. 



Fig. 613. Shell thin, sub-oval, cinereous or rufous, with sometimes 

 T one or two obsolete, dilated, revolving bands ; columella 



callous ; callus pressed laterally into the umbilicus, whitish ; 

 N.pusiiia. ^ii^^i3iij(3us nearly closed and consisting only of an arcuated, 

 linear, vertical aperture. Length, about one fourth of an inch. 

 Inhabits the southern coast. ( Say.^ 

 Buzzard's Bay, three to eight fathoms {Stimpson). 



Oenns MA]WI?IA, Klein. 1753. 



Operculum large, horny, simple. 



Shell ovate or sub-ovate, solid, smooth, usually without epidermis ; 

 spire small, acute, whorls simple ; aperture semicircular ; inner lip 

 oblique, thickened, callous ; uml)ilicus funiculate ; columella adherent 

 to, and spirally contorted in, the umbilicus ; the apex more or less 

 dilated, convex, and rounded. 



Mamma? immaculata. 



Fig. 168. 



Shell small, sub-ovate, solid, bluish-white, spotless, glossy, umbilicus free. 



Natica immaculata, Totten, Sillim. Journ. xxviii. 351, fig. 6. — Gould, Inv. 1st ed. 234, 



fig. 168 — De Kay, N. Y. Moll. 122, pi. 7, fig. 146. 

 Mamma? immaculata, Stimpson, Check Lists, 5. 



Shell sul>ovate, extremities rather pointed, solid, milk-white, and 

 glossy when deprived of its thin, greenish-yellow epidermis ; spot- 

 y. j,^^ less, lines of growth faintly perceptible ; whoj-ls about five, 

 the spire very short and pointed, and the suture not im- 

 pressed ; the lower whorl convex and rounded, prolonged at 

 tlie base ; aperture narrow oval, rather acutely curved at 

 mnn'Z- basc ; outer lip sharp, inner margin coated Avitli ivory-white 

 callus, not modifying the umbilicus, but extending along the 

 margin to its posterior limit ; at the posterior angle of the aperture 

 it is much thickened, and, running along under the junction of the 

 whorls, causes a white spiral line to appear externally, just below 



