174 BTJCCINUM. 



whorls apparently twisted, in consequence of the ribs being ob- 

 liquely curved. 



" Yar. 2. LITTORALIS (King). (Fig. 316.) Yentricose; .spire 

 shorter, and body-whorl disproportionately large ; longitudinal 

 plaits strong ; throat often coffee-colored. 



" Yar 3. PAUPERCULA. Dwarf and depauperated. 



"Yar. 4. STRIATA (Fig, 319). Thinner than usual, with the 

 longitudinal ribs nearly obliterated. 



"Yar. 5. PELAGICA (King). Twice the usual size, and also 

 thinner, with a longer spire. 



"Yar. 6. ZETLANDICA (Forbes). (Fig. 364.) Smaller, and of 

 a thin and delicate texture, destitute of longitudinal ribs ; epider- 

 mis smooth and membranous. 



"Monstrosities. 1, sinitstrorsum (fig. 321). Spire reversed. 

 2, carinatum. Upper part of each whorl encircled by a keel or 

 more prominent spiral ridge. (B. carinatum, Turton). 3, im- 

 perials. Body-whorl compressed and elongated, so as to give it 

 the shape of a Valuta, (B. imperials, Reeve, PL 78, fig. 365). 

 4, acuminatum (lig. 320). Spire extending to a considerable 

 length; whorls flattened, and the periphery consequently angu- 

 lated (B. acuminatum, Brod.). 5, conico-operculatum. Opercu- 

 lum patelliform or conical. 6, bi-operculatum and tri-opercula- 

 tum. Having two or three opercula. 



Animal. " Body varying in color from dirty white to yellow- 

 ish, speckled or streaked with black ; mantle rather thick, folded 

 over the pillar of the shell ; pallial tube extensile, protruded an 

 inch or more beyond the canal, recurved, and obliquely truncated 

 at the extremity ; head small, narrowish ; proboscis ve^ long 

 and powerful, enclosing a muscular sheath, within which lies the 

 tongue ; tentacles flattened, long and pointed, abruptly thickened 

 at the base ; eyes very small, placed nearly one-third of the way 

 up the tentacles ; foot oblong, with shelving sides, capable of 

 considerable expansion and distension, rounded in front, with 

 small ear-shaped corners, and bluntly-pointed behind ; very large 

 and fleshy, with a short point at the extremity. Odontophore 

 (PI. 27, fig. 29): central tooth armed with seven cusps or points 



