534 Bi i.j>ii)7E. 



ratc'ly and e(]ually arcuated tliroughout. The pillar lij», 

 wliich is llanked by a siibiiinbilicus, or (ilse a strongly- 

 marked indentation, is peculiarly long, solid, slightly 

 tortuous, and almost perpendicular. Fine s})ecimeus 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 very large, truncate in front, 

 strongly bilobcd 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 (juadrate and slightly 

 bilobcd 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 verge of the Laminarian zone to 

 as deep as one hundred fathoms. Mr. Jeifreys has it 

 from Torbay and Plymouth, in the Turtonian collection. 

 Scarborough (liean); 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 hundred fathoms at Zetland 

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

 West of Ireland (Barlee). 



