534 BULLID/E. 



rately aud equally arcuated throughout. The pillar \i\), 

 which is flanked by a subumbilicus, or else a strongly- 

 marked indentation, is peculiarly long, solid, slightly 

 tortuous, and almost perpendicular. Fine specimens occa- 

 sionally measure five-eighths of an inch in length, and 

 three- eighths in breadth; such individuals, however, are 

 very rarely obtained. 



The animal is rather firm in its texture. It is entirely 

 white. The capital disk is ver^^ large, truncate in front, 

 strongly bilobed posteally, lobes somewhat ovate lanceo- 

 late. We could find no eyes in this disk. Lateral lobes 

 large, but not meeting upon the shell ; supracaudal lobe 

 truncate, reflected on the spire ; foot quadrate and slightl}^ 

 bilobed behind. The gizzard is seen shining through the 

 shell. 



This, though among our scarcer shells, has a wide dis- 

 tribution from north to south, as well as a great range 

 extending from the lower vero-e of the Laminarian zone to 

 as deep as one hundred fathoms. i\Ir. Jeftreys has it 

 from Torbay and Plymouth, in the Turtonian collection. 

 Scarborough (Bean); Whitburn, Northumberland (Alder); 

 Berwick (Johnston) ; Aberdeen (Macgillivray) ; Loch 

 Fyne (Barlee), where we have dredged it in fifty fathoms ; 

 also in twenty and forty fathoms in the Hebrides ; and 

 in sixty, eighty, and one hunelred fathoms at Zetland 

 (JNl' Andrew and E. F.). Cork Harbour (Humphreys) ; 

 West of Ireland (Barlee). 



