532 BULLIDiE. 



ation of the broad and appressly reflected pillar lip ; it is 

 slightly elevated above the crown posteriorly, and is 

 rounded at both extremities, but more especially at the 

 anterior one, which is broad, but not at all obtuse. The 

 simple and acute edge of the outer lip, which is regularly 

 arcuated throughout, but is perhaps a little straightened, 

 not however retuse in the middle, advances a little above, 

 and recedes but little below. Full-sized specimens mea- 

 sure, on the average, nearly an inch in length, and about a 

 third less at the broadest part. 



The animal is massive and of slug-like appearance and 

 consistency when in motion. It is of a general yellowish 

 or olivaceous hue, speckled all over with minute sand-like 

 spots of brown, black, and yellow. The capital lobe is 

 large, and when fully expanded, as represented in our 

 figure, from a beautiful drawing communicated by Mr. 

 Alder, is ovate-triangular, but when partially contracted 

 exhibits a distinct bilobation of its posteal or tentacular 

 portion ; these tentacular lobes are rounded. On the 

 frontal portion of the disk are two closely set immersed 

 dark eyes, with pale areolae. The lateral lobes are very 

 large and rounded ; they meet on the front of the shell : 

 the supra-caudal (equivalent to opercular) lobe is large, 

 and reflected on the spire ; the extremity of the foot is 

 broad and somewhat bilobed. Individuals of the variety 

 cornea, taken by us in the Mediterranean, had the soft 

 parts much paler, with scattered vivid yellowish or tawny 

 dots. 



This is mainly a southern species in the British seas, 

 and on the whole must be regarded as among our less 

 common shells. It inhabits the Laminarian zone. Ex- 

 mouth (Clark) ; Southampton (Rootscy); Poole (Dillwyn); 

 Weymouth (Jetfreys) ; Falmouth (Cocks, Alder) ; Sal- 



