104 DK. GWrN JEFFREYS ON 



latter being Nucula lanceolata of Lamarek=N. limatula, Say,= 

 Yoldia hyperborea, Loven). 



= N. oblonga, G. B. Sowerby. 



= Yoldia arctica, Moller. 



Several specimens of different ages. 



From 3 to 48 fathoms. 



The sculpture is very variable. In some specimens the striae are 

 at first transverse and close-set, and afterwards become oblique and 

 distant ; in others the strise are confined to tlie anterior side of 

 the shell, as in L. semistriata of Mr. S. "Wood, while in others the 

 striae are almost entirely absent. In the description of Ificcula 

 lanceolata by James Sowerby the shell is described as " smooth." 

 Perhaps he intended the Crag shell referred by Mr, "Wood to Leda 

 myalis of Couthouy, but which does not appear to be that 

 species. 



Circumpolar. 



Leda frigida, Torell. 



~ h. nana, Sars. 



Several specimens, 



3 to 48 fathoms. 



Also Spitzbei^gen, Norway, and southwards to the coast of 

 Portugal, 50-1380 fathoms. Fossil at Messina, in the Zanclean 

 division of the Pliocene formation (Seffuenza) ! 



Leda minuta, Midler. 



Two specimens. Ooshima, and 48 fathoms. Agreeing in the 

 most minute j^articnlars with specimens dredged by me in St. 

 Magnus Bay, Shetland. 



North Atlantic. ' Pore' exp. : "W. coast of Ireland, 164-420 

 fathoms ; Bay of Biscay, 305-717 fathoms, 



Cardium Grceklandicum, Chemnitz. - 

 Several young specimens from 48 fathoms. 

 Spitzbergen {Torell); United States {Gould and others); 

 Behring's Strait (Stimpson). Circumpolar. 



Cardium Islandicum, Ch. 

 Several young specimens from 3-48 fathoms. 

 United States ( Gould and otliers) ; "Wellington Channel {Bel- 

 cher). Circumpolar. 



Cardita borealis, Conrad. 



Endermo Harbour, 4-7 fathoms. 



Undistinguishable from Crag specimens of C. orliculata, S. 



