GASTEROPODA. 



115 



Icy Cape by Captain Belcher, R. N. Two species are 

 named, T. hicarinata and uniearinata ; some are taken on 

 the coasts of Scotland, Ireland, and Northumberland. 



Calcarella. Souleyet. — Shell almost globular, horny, 

 transparent, with three strongly marked keels, which are 

 far apart, and toothed ; the teeth are slender, triangular, 

 and regular ; the whorls consist of three smooth convolu- 

 tions, and a mammeliformed apex ; the aperture is three- 

 sided, rather crescent-shaped ; the outer lip has three 

 points; the columella lip is thickened and sinuated. 

 Animal unknown. — 1 species. 



Calcarella spinosa is from the South Seas. 



Family 1 8. — NARICA CEA. 



The animal has a snout-formed head, spindle-shaped 

 tentacula ; between the head and foot an appendage like 

 that of Lithedaphus *, and on each side of the foot is a 

 horizontal projecting flap, ending in a point. The shell is 

 half globular, white, ribbed, cross-barred or granulated ; 

 the aperture entire ; lip simple ; operculum smaller than 

 the aperture. — Marine. 



Narica. Recluz. (Vanicoro Quoy and Gaim. ; Merria 

 Gray; Leucotis Siv.) — Shell semiglobular, 

 always white, striped, ribbed, or cross-barred ; 

 spire short ; the aperture almost half circular ; 

 the edges of the aperture not connected ; the 

 outer lip simple, the inner tolerably straight ; Narica can- 

 at the back of it a simple umbilicus ; oper- 

 culum small, not closing the aperture. (Woodward says 

 a velvety epidermis.) Animal, with a snout-formed head, 

 fusiform tentacula, with small eyes on the outer base ; 



* Of Owen. See genus Mitrularia, in Family 20. 

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