432 Rev. M. J. Berkeley and Mr. Eloffman 



rishraent, 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 means 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. 



Mxizzle proboscidiform, contractile, as long as the foot, flat below, 

 convex above and wrinkled transversely, of a deep ohvaceous 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 is no 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 wa? preserved were of a dark verdigris. 

 When removed from the shell it was found to consist of nearly 6|- volu- 

 tions; the first of which was very obtuse, and with the second green; 

 the three following dark green. 



