262 PYRAMIDELLID.E. 



" Animal with a spiral shell of eight volutions, hyaline 

 bluish Avhite throughout, slightly shot with flake-white 

 cloudy matter. Mantle plain. Head a cloven muzzle 

 representing a second pair of short tentacula, mouth at 

 the termination of the scissure ; the true tentacula subtri- 

 angular, flat, bevelled, not very short, rounded at the tips, 

 slightly setose ; the eyes black, situated exactly at the 

 internal bases of the tentacula, immersed in the skin, and 

 so close to each other that a fine hair can scarcely be laid 

 between them (I never saw the eyes so contiguous in any 

 other animal). Foot large, rather long, membranous, re- 

 flected at the sides on itself — which reflection it in some 

 measure retains on the march — largely concavely arcuated 

 in front, causing the auricles to be pointed, and gradually 

 tapering to a subtriangular posterior point. The suboval 

 corneous operculum is carried, on a simple lobe, in a very 

 advanced position, that is, nearly at the junction of the 

 foot with the body. 



" The animal is vivacious, displays the eyes on the 

 march, and makes rapid progression. The head and cloven 

 muzzle nearly resemble those organs in Jeffreysla dia- 

 fhanar — Clark, MSS. 



This species is dredged more abundantly at Oban, Skye, 

 Loch Fyne, and other parts of the western coast of Scot- 

 land ; but is likewise taken at Exmouth, Torquay, AVey- 

 mouth, and Guernsey : also at Birterbuy Bay in Gal way. 

 It extends to the Mediterranean, and is found also in 

 the north of Europe. 



