310 l^YRAMIDELLIDiE. 



horizontal base of the penult turn, and almost a rectangle, 

 likewise, Avith the abruptly arcuated base of the outer lip. 

 This last is simple, acute, straight above, and neither ex- 

 panded nor laterally projecting ; it advances at the ante- 

 rior extremity. There is no real umbilicus, yet owing to 

 the reflection of the pillar lip there is often an appearance 

 of a very minute axial perforation. Our examjiles, which 

 are three-eighths of an inch long, measure about the ninth 

 of an inch across at the base. 



The animal is entirely white ; its tentacula are lanceo- 

 late and auriform, often folding in their sides so as to appear 

 oblongo-quadrate with truncated or even emarginated tips ; 

 their bases are set well apart, and the eyes are seen closely 

 approximated at their inner angles, small, black, each 

 placed on the side of a small dusky spot at the anterior ex- 

 tremity of an oval opaque white space. The mentum is 

 narrow and strongly bilobed in front ; the foot is oblong, 

 truncate in front, and rather acutely angled ; gently 

 pointed behind. 



This beautiful shell is one of the most elegant of the 

 many rarities which inhabit the Hebrides, where it was 

 first found by Mr. Jeffreys, and afterwards by Mr. M'An- 

 drew. It occurs throughout the Clyde district, the inner 

 and outer Hebrides, and the Zetland Isles, and has lately 

 been dredged by the indefatigable naturalists of Northum- 

 berland at Whitburn on this coast. A few of the Scottish 

 localities will serve to show its range in depth : in thirty 

 and fifty fathoms, Loch Fyne ; in twenty fathoms sand, 

 Lismore ; in twenty-five fathoms, mud, Sound of Skye ; in 

 thirty fathoms, off Croulin Island, sandy mud ; in thirty- 

 four fathoms, Elgin ; in eighty and ninety fathoms on sand, 

 Zetland. 



Professor Loven finds it in the Scandinavian seas. 



