Fam. 52.] NATURAL HISTORY SOCIETY. 133 



2. Mangilia bicarinata,. Cout. Shell tapering about equally 

 at both ends; whorls convex, with numerous distinct revolving 

 lines, and, between them smaller ones; about the middle of the 

 whorl, there is a deep groove with a prominent line on each side ; 

 aperture narrow, elliptical, with a slight notch at the posterior 

 €nd ; outer lip thin, toothed by the* revolving lines. Whitish 

 slate-color, or dusky brown. L. 10 ; D, 5 ; An. 40° ; Wh. 6 ; Ap. 

 I. — Arctic Seas to N. J. 



3. Mangilia cerina, Kurtz & Stim. Shell fusiformly tur- 

 reted, with about 10 elevated ribs, and numerous, revolving 

 striae; aperture oblong; lip sharp with a decided angle and 

 notch at the posterior fourth. Waxy or ashy. L. 6 J ; D. 2 J ; 

 An. 25° ; Wh. 7 ; Ap. J.— Cape Cod and south. Rare. 



Family 51. FASCIOLARID/E. 



Shell spindle or pear-shaped ; spire acute ; aperture elongated- 

 oval, with a moderate to long, open, straight canal ; columella 

 smooth or very slightly folded Animal rather small, retractile 

 to about a third of a whorl from the aperture. 

 1. FuLGUR, Montf. 



Shell pear-shaped, rather thin, the whorls angulated and spin- 

 ous or nodulous; body whorl large, attenuated below into a long, 

 twisted canal. Animal rather small, retra'-tile, with its opercu- 

 lum, far within the aperture. 



1. Fulgur canalicuIaiuSj L. Shell large, pear-shaped, covered 

 with revolving lines, and a hairy epidermis ; whorls shouldered, 

 outer edge nodular, and a broad canal at the suture. L. 150 ; 

 D. 80 ; An. 90°; Wh. 6 ; Ap. f ; canal f of Ap.— Mass. and south. 

 Very common. 



2. Fulgur cainca, Gml. Shell large, solid, pear-shaped; whorls 

 flattened at the summit, and the angle raised into a series of 

 compressed tubercles, about 9 in number, on each revolution. L- 

 150; D. 75; An. 85°; Wh.fi; Ap. f ; canal f of Ap. Mass 

 and south. Common. 



3. Fulgur perversa, L. Shell much like the last but reversed, 

 forming a sinistral shell. It grows to the length of over 300. 

 Its northern limit is about Cape Hatteras. 



Family 52. BUCCINID/E. 



Shell ovate to pear-shaped, rather thin ; spire elevated ; canal 



