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. Lovén’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 
inclmed; 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 striz 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. iii. p. 219, pl. 88. f.8. 
A. supranitida, 8. Wood. 
—-, Brit. Moll. iii. p. 220, pl. 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 striz are visible on all the volu- 
tions. It is curious, that whilst M. Lovén scarcely mentions 
the animal of Eulima, he gives elaborate generic characters of 
Aclis, of which he considers the A. supranitida of Searles 
