sane new and peculiar Mollusca. 239 



pale yellowish-brown, instead of dark chestnut ; and some 

 Bpecimens are ^' su]ji)licate lungitudiually," as described by 

 ]\li<^hels and Adams. 



The late rrot'essor Stimpson changed the specific name to 

 Mif/heLfi, on the ground that this species "was not the Turho 

 arenarius of ^lontagu ; but no shell of that name was even 

 mentioned by ^loutagu. Helix arenaria of Matou and 

 Rackett {'Turbo arenarius of Turton) is Odostomia decussata. 



Rissoa casfanea, Moller. 



Hissoa casianca, Moll. Ind. Moll. Groenl. p. 9. 



Body whitish, with a tinge of pale brown : /lead bilobed 

 and prominent : (en fades club-shaped, ciliated at the edges 

 and more distinctly at the tips : e^/es on small bulbs at tlia 

 outer base of the tentacles : foot oblong, squarish and double- 

 edged in front, with angular comers, bluntly pointed behind ; 

 no caudal filament could be detected. Rather common. 



Godhavn, 5-20 fms. ; Station 4, 20 fms. ; 5, 57 fms. ; 

 Holsteinborg, 10 fms. Greenland (Moller). Davis Strait, 

 30-70 fms. (Sutherland, /(Ze S. P. Woodward). Gulf of St. 

 Lawrence, New Brunswick, and Labrador (Whiteaves). New- 

 foundland ( Yerkrilzcn) . Iceland and Spitzbergen (Torell) ! 



Rissoa glohdus, Moller. 



Rissoa globulnSy Moll, Ind. Moll. Groenl. p. 9. 



Body pale yellowish-white : head snout-like, bilobed or 

 cloven vertically : mouth small and pursed up or contracted : 

 tentacles club-shaped, serrated or notched at the edges, and 

 liaving a few cilia at the tips : c>/es round, black, on the outer 

 base of the tentacles : foot proportionally long, rounded and 

 double-edged in front, and bluntly pointed behind ; no caudal 

 filament observable. Very common. Feeds on Laminarice. 

 Swims on its back, and spins a byssal thread. 



Station 4, 20 fms. ; 5, 57 fms. ; Holsteinborg, 3-35 fms. 

 Greenland (Moller, Eschriclit) ! Casco Bay, United States 

 (Mighels and Adams). Gulf of St. Lawrence (Whiteaves). 

 Spitzbergen (Torell) ! Vadso, Norway (G. O. Sars). 



Not Cingula latior of Mighels and Adams (Bost. Journ. 

 Nat. Hist. iv. p. 48, pi. 4. fig. 22), a specimen of which I. 

 dredged on the coast of New England in 187 L 



TurriteUidsB. 

 Turritella erosa, Couthouy. 



TurrilcUa crum, Couth, in Boston .Tourn. Nat. Hist. ii. (1839), p. 103, 

 pi. 3. r. 1. 



Body lemon-colour above, whitish underneath : head or snout 



