216 NATICID.E. 



Icy Cape, and Behring's Straits, at depths ranging from 

 3 to 60 f. 



It is more sluggish than any of the other Naticce 

 which I have examined. A sj)ecimen dredged by Mr. 

 Barlee and myself in Shetland is more than an inch 

 and a half long and an inch broad. Mr. Edward^ of 

 Banff got another specimen nearly as large from the 

 stomach of a cod. 



Olafsen and Povelsen accurately descri])ed this shell 

 in the account of their journey through Iceland, 1772. 

 The Latin part of this description was republished by 

 Miiller and Gmelin ; and the latter gave a name to the 

 species. It is the N. helicoides of Johnston, N. cana- 

 liculata of Gould (not of Lamarck), N. exulans of 

 Loven's MS. (according to Gould), and N. cornea of 

 Moller. 



B. Shell more or less solid, with a short or compressed spire ; 

 umbihcus of various sizes. 



2. N. Grcenlan'dica"^, Beck. 



N. groenlandica (Beck), Moller, Ind. Moll. Gr. p. 7. N.pusilla, F. & H. 

 iii. p. 341, pi. c. f. 7. 



Body crcamcolour . tentacles very short : ej/es not percep- 

 tible, if any : foot smaller than in many other species. 



Shell globose, resembhng that of typical species of Heli.v, 

 moderately solid, almost semitransparcnt, lustreless : sculpture, 

 consisting only of extremely fine and obscure spiral striae and 

 equally minute but more numerous lines of growth: colour 

 white under the epidermis, which is creamcolour : spire short, 

 slightly prominent : wJiorls 4-5, tumid ; the last occupies 

 eight-ninths of the spire ; apex always eroded : suture nearly 

 straight, very narrowly excavated inwards : mouth equal in 

 area to one-third of the shell, and in length to five-eighths of 

 the spire, expanding and rounded or slightly angulated at the 

 base : outer I'lp somewhat incurved above, and having a bevelled 



* Inhabiting Greenland. 



