290 NATICID.E. 



In Shetland also it occasionally takes or sucks the 

 fish-baits. Its horny jaws are large; and when ex- 

 panded they form a triangular plate. The size of my 

 largest specimen is 1ft x f inch. Tins species difter 

 froni N. Gmnlandka in size, solidity, colour, and the 



umbilicus. , A/r 



It is perhaps the Nerita levida of Laskey (Mem. 

 Wem. Soc. i. p. 409), who says, « It bears some resem- 

 blance to N. glaucina \_N. catena], but has a more pro- 

 duced apex, and is divested of the markings of that 

 shell " It appears to he the N. glawmal of Scaccln. 

 Swainson's N. sordida is N. plumbea of Lamarck, an 

 exotic species, to which Philippi erroneously referred 

 the European shell. 



4 N. cate'na* Da Costa. 



as 2V. canrena). 



Body yellowish or drab, with a purplish tinge on the upper 

 to arilfSy Uneated with purplish-brown : snout fleshy : 

 Z, ft or orifice of the proboscis globular small, lying under- 

 Zh the snout: tmtailes rather long, slender, and pointed, 

 leed n fle middle above the snout, and nearly coneealedby 



tho front lobe of the mantle : [eyes " so excessively mmute as 

 the li rail loue u , l , (Tolummous and when 



S^CfiSX JKSS of k shell, divided across 

 so 2 to form 1 w -unequal portions, the posterior of whists 

 he kr°ei bluntly pointed behind; front lobe notched or in- 

 dented * the mi*ffii male organ situate under the right ten- 

 tacle: ovary pale yellow : ( ,W dull olive. _ 



Shell globose, and somewhat resembling an AmpyUapa >n 

 Bhaw moderately thick and solid, opaque, glossy: sculpture 

 microscopical and very close-set flexuons spiral itn* : colour 

 We3wish-white or buff, ornamented with a row of red- 

 & brown or light chocolate short, oblique or zigzag, longi- 

 ^lal streaks ft the top of each whorl, and sometimes (tre- 

 * From its chain-like rows of spots. 



