some neio and peculiar Mollusca. 239 



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

 specimens are "subplicate longitudinally," as described by 

 Mighels and Adams. 



The late Professor Stimpson changed the specific name to 

 Mighelsij on the ground that this species was not the Turbo 

 arenarius of Montagu ; but no shell of that name was even 

 mentioned by Montagu. Helix arenaria of Maton and 

 Rackett {Turbo arenarius of Turton) is Odostomia decussata. 



Bissoa castanea, Moller. 



Itissoa castanea, Moll. lud. Moll. Groenl. p. 9. 



Body whitish, with a tinge of pale brown : head bilobed 

 and prominent : tentacles club-shaped, ciliated at the edges 

 and more distinctly at the tips : eyes on small bulbs at the, 

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

 edged in front, with angular corners, 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, /cZe S. P. Woodward). Gulf of St. 

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

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



Btssoa globulus, Moller. 



Hissoa glohidus, Moll. lud. 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 

 having a few cilia at the tips : eyes 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, Eschricht) ! 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 1871. 



TurriteUidse. 



Turritella erosa, Couthouy. 



Turritella erosa, Couth, iu Boston Journ. Nat. Hist. ii. (1839), p. 103, 

 pi. 3. f. 1. 



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



