found at Aneiteuiu, New Hebrides. 41 



1853), describing the only species known to him as 'J. antipo- 

 ilarum. — N. Zealand.' Now it strikes nie that the (only) two- 

 tentaclcd Slug got during last cruise, and believed by you to be 

 the type of a new genus, will fall into this one — and I make this 

 memorandum for the purpose of inducing you to peruse the 

 J)ecember Number of the 'Ann. and Mag. of Nat. Hist.' now on 

 the table at the reading-room of the Library, in case I should 

 forget to mention it to you verbally." 



1 have only to add to this, that I have studied the characters 

 of the genus Janella given by Dr. Gray, in the Number of the 

 ' Ann. and AJag. of Nat. Hist.' referred to, and I find that the 

 three following items are quite sufficient in themselves to show 

 that Janella antipodarum can have but little affinity to the mol- 

 lusk above described. 



Janella (Gray). Aneiteum Slug. 



1st. Shell none, or at least 1st. Shell internal, elon- 



there is no appearance of any gated in form, of considerable 



through the skin. thicknessandsmoothlyrounded 



off at the extremities. 



2ndly. The tentacles instead 2ndly. Teutacula distinctly 



of being placed on the head, as arising from the head, as in 



in Philomt/cus and all the other Pldlumycus, &c. 

 Arionidffi and Helicida?, are 

 placed in the front part of the 

 mantle. 



3rdly. Mantle covering the 3rdly. Mantle of small su- 

 wholeof the back with a slightly perficial extent, lying on the 

 raised margin, leaving a rather right side of the body some- 

 broad space between the edge what in advance of the centre, 

 and the edge of the foot. but not extending all over the 



back. 



As it is yet possible that a shell may exist in Janella, although 

 there is no external appearance of any, too much importance 

 nuist not be attached to its apparent absence as a distinctive cha- 

 racter, but the remaining items need no further comment. 



The internal (Economy of the Aneiteum Slug is similar in all 

 essential particulars to that of Limaw. There are however in the 

 former many peculiarities, which will be noticed, as they present 

 themselves, in the explanation of the figures. 



Port Curtis, February 13, 1855. 



EXPLANATION OF PLATE III. 



Fi(j. \ Tlic animal as it appoarcd in motion. 

 Fuj. -J Ditto at rost. 

 Fir/. .1 Tlic scutc'llum. 



