ACLIS. 453 



the animal of neither has., I believe, occurred to a British 

 observer; we earnestly request the discoverer of either to 

 examine it carefully and communicate his notes, as the animal 

 requires further investigation before its position can be per- 

 manently settled. It is doubtful whether the Turbo ascaris 

 of Turton ought to enter M. Loven's genus; however, as it is 

 only an ad-interim deposit, we give his generic diagnosis : 



" Animal slender ; head not proboscidiform ; tentacula 

 slender, cylindrical, somewhat inflated, approximating at the 

 bases, at which points the eyes are immersed and externally 

 inclined; there is a long, strong, and recondite proboscis; 

 tongue simple ? ; the upper lobe of the foot is divided from 

 the sole, which is narrow and produced. The operculigerous 

 lobe is large, differing in shape on each side ; the right one is 

 the largest, with three to four plications ; the left forms a single 

 rounded lobe, posteally produced into a fold. The sole of the 

 foot is tongue-shaped, and anteally truncate. Operculum ? 

 Shell turreted, rough or pitted, having numerous volutions 

 furnished with elevated spiral striae or sharp ridges. Aper- 

 ture oval." 



Though this genus appears to have several connecting 

 links with the two preceding ones, the above generic charac- 

 ters are so very distinct in many particulars, that it is unne- 

 cessary to make any comparative observations. The discovery 

 of the animal of our Turbo ascaris will clear up all doubts. 



A. ASCARIS, Turton. 



A. ascaris, Brit. Moll. hi. p. 219, pi. 88. f.8. 

 A. supranitida, S. Wood. 



-, Brit. Moll. iii. p. 220, pi. 90. f. 2, 3; and iv. p. 273; 

 (animal) M.M. f. 5. 



Since the above was written we have ascertained that the 

 A. ascaris and A. supranitida are varieties of each other; the 

 first is spirally striated, the latter apparently smooth, but 

 under the lens the obsolete striae are visible on all the volu- 

 tions. It is curious, that whilst M. Loven scarcely mentions 

 the animal of Eulima, he gives elaborate generic characters of 

 Aclis, of which he considers the A. supranitida of Searles 



