240 Dr. J. Gwyn Jeffreys on 



long, cylindrical and flexible, wrinkled across, cloven in front, 

 restlessly moving about : tentacles long, slender and flattened, 

 with rather blunt tips : ei/es black and round, sessile on the 

 tentacles at their outer base : foot thick and long, rounded and 

 double-edged in front, with ear-shaped corners or flaps, bluntly 

 pointed behind : opercular lohe large and thin : operculum 

 round and multispiral, with the nucleus in the centre ; the 

 edges of the whorls overlap, as in T. terebra. Not shy, and 

 more tenacious of life than most of the other arctic Mollusca. 

 This survived and crawled about in fresh sea-water, after 

 being sifted from a heap of stuff, which had been dredged six 

 days and was in a putrid state. 



Godhavn, 5-80 fms. ; Station 1, 175 fras. ; 3, 100 fms, ; 

 4, 20 fms.; 5, 57 fms.; Holsteinborg, J 2 fms. Greenland 

 (Moller, Amondsen). Gulf of St. Lawrence to Cape Cod, 

 20-lOG fms. Spitzbergen (Torell) ! Fossil at Bridlington ! 



The composition of the shell appears to be less compact or 

 homogeneous than in its congeners, and to be peculiarly liable 

 to the corrosive action of some acid in the sea-water. See the 

 remarks of Mr. Justice Grove in the Introduction to ' British 

 Conchology,' vol. i. pp. lii-liv. In full-grown shells the 

 remaining top whorl is closed by a hemispherical plug of 

 shelly matter, the apex never being perfect. The young is 

 less conical and more cylindrical than T. acicula, and the 

 sculpture is different. T. EschricJitii of Middendorff, from 

 Sitcha Island, is allied to the present species, but (judging 

 from his description and figure) must be distinct. 



It is the T. clathratula of Mr. S. V. Wood, 1848. 



Turritella reticulata j Mighels and Adams. 



Turritella reticulata, Mig-h. & Ad. in Boston Journ. Nat. Hist. iv. 

 (1842), p. 50, pi. 4. f. 19. 



Body yellowish-white, with a faint tinge of brown : head 

 snout-shaped, thick and strong, cloven in front, and wrinkled 

 across : tentacles awl-shaped ; tips blunt ; edges smooth : eyes 

 placed on small bulbs at the outer base of tentacles : foot 

 broad, triangular, squarish and double-edged in front, with 

 drooping corners, rounded or bluntly pointed behind. Slug- 

 gish. 



Station 1, 175 fms. ; 4, 20 fms. ; 5, 57 fms. ; Holsteinborg, 

 10 fms. Greenland (Moller). Davis Strait, 30-70 fms. 

 (Sutherland, _/f?e S. P. Woodward). Gulf of St. Lawrence, 

 20-50 fathoms (Mighels and Adams, Whiteaves). New- 

 foundland (Willis). Nova Scotia (Stimpson) ! Spitzbergen 

 (Kroyer, Torell) ! 



T. lactea of Moller, 1842. 



