432. Rey. M. J. Berkeley and Mr, Hoffman 
rishment, it was thought advisable after a few days to kill it by immer- 
sion in spirits, lest it should be unfit for dissection. Various engagements 
precluded the possibility of examining it for some weeks, and as partial 
decomposition had taken place, we almost despaired of success. Most 
fortunately we were able to procure through the kindness of Dr. Sibbald 
another specimen, brought from Ceylon, and thus were enabled to verify 
the observations made upon it. This however was by no meats in so 
perfect a state as to supply all the information desired, and therefore if 
future opportunities of comparing the present account with abundant 
good specimens should prove us in any particulars incorrect, due allow- 
ance must be made. Our observations it will be seen establish completely 
the correctness of Lamarck’s views. 
Foot broadly obovate, subtriangular: sometimes when adhering to 
the side of the glass nearly round, thick; small for the size of the shell, 
without any groove in the anterior margin; above between umber and 
olivaceous, with a few brown freckles and wrinkles, not furnished with 
any fringe or cilia; below pale umber, cinereous. 
Tentacula thickest at the base, then suddenly contracted and there 
bearing the eyes externally ; the upper part much attenuated. The left 
tentaculum much longer than the right with a constriction in the middle 
of the attenuated portion. 
Muzzle proboscidiform, contractile, as long as the foot, flat below, 
convex above and wrinkled transversely, of a deep olivaceous tint, and 
presenting very much the appearance of a common Leech; slightly 
notched in front; immediately below the notch is the aperture of the 
mouth, There isno crest or appendage to the lip. 
Mantle with a very small canal ; just within the outer edge furnished 
with small triangular teeth. 
Operculum horny, round, convex within, depressed externally, spirally 
striate, the margin thin, transparent, ragged. 
The spirits in which the animal was preserved were of a dark verdigris. 
When removed from the shell it was found to consist of nearly 62 volu- 
tions; the first of which was very obtuse, and with the second green; 
the three following dark green. } 
