174 BUCCINUM. 



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

 liquely curved. 



u Yar. 2. LITTORALIS (King). (Fig. 316.) Ventricose ; spire 

 shorter, and body-whorl disproportionately large ; longitudinal 

 plaits strong ; throat often coffee-colored. 



"Yar. 3. PAUPERCULA. Dwarf and depauperated. 



"Var. 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, sinistrorsum (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- 

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

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

 4, acuminatum (fig. 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, U-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 ver}^ 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 



