342 Mr. E. Duprey on Jersey Littoral Shells. 



Littorina obtusata, L. Of all colours, and sometimes with bands. 

 In a small aquarium I liave kept a specimen for some months 

 which has three tentacles and three eyes. The middle tentacle 

 is bifid ; and the eye behind it is double or formed of two little 

 black dots adhering to each other ; the two other or normal eyes 

 are simple. 



neritoides, L. 



rudis, Maton. Of all colours, with and without bands, 



, var. tenebrosa, Mont. Living with Lciscea rubra amongst 



Lichina, and not more than about j\ of an inch long. When 

 kept with L. rudis of the same size, it was soon outgrown by the 

 latter. 



Utorea, L. This edible species is now more rare in Jersey 



than Rissoa lactea. 



Rissoa striahda, Mont. Under stones, not uncommon. 



lactea, Michaud. Not uncommon in Jersey in stony ground. 



I have found it living at Pointe des Pas, Samares Bay, and La 

 Kocque ; its habitat is peculiar — adhering to the under surface of 

 stones which are buried several inches, and often very firmly, in 

 clayey sand. Rissoa striahda and Adeorbis subcannatus are also 

 found with it, and rarely Area lactea. It seems difficult to under- 

 stand how they can live there ; for often the stones, although 

 weighing but a few pounds, are diificult to turn over, so tightly 

 are they imbedded. 



costata, Adams. Not common. 



: jparva, Da Costa. Abundant. 



-, var. interrupta, Adams. Bare. 



membranacea, Adams. 



violacea, Desm. Two very distinct sizes. 



costidata, Alder. Two distinct sizes and three diff'erent types : — 



(1) Entirely white. Rare. 



(2) Brown nearly all over (except a white rib near the 

 mouth), of different shades and forming zigzag streaks. 



(3) White, with the mouth and longitudinal furrows between 

 the ribs brown. Common. 



striata, Adams. 



scmisiriata, Mont. Rare. 



cingillus, Mont. 



, var. rupestris, Forbes. 



Barleeia rubra, Mont. 



, var. unifasciata, Mont. 



, var. pallida. 



Skenea planorbis, Fabr. Gregarious in shelly gravel, with Asfarte 

 triangidaris, at La Rocque. 



Homalogyra atomus, Phil. 



Scalar ia communis. Lam. Living amongst sand andZostera ; lower 

 part of the shell often buried in the sand. Coloured bands some- 

 times absent. 



Odostomia pallida, Mont. Under stones. 



acuta, Jeff. Under stones. 



