234 Dr. Gwyn JeiFreys on Arctic 



Scandinavia, and N.E. America, surface to 440 ft. : Macclesfield? 

 500-600 ft., and Moel Trjfaen, 1330-1360 ft. (Darbishire) : 

 Port Kennedy, Greenland, 100-500 ft. (Walker). 



Synonyms very numerous. A specimen dredged in Dis- 

 covery Bay by Capt. Feilden corresponds -with the variety 

 elUptica of A. sulcata. 



Astarte fabula^ Reeve. 



Astarte fabula, Reeve, in Belcher's Last of the Arctic Voyages, vol. ii. 

 p. 398, pi. xsxiii. f. 5, a, b (from type !). 



St. No. 3 (Feilden). 



Eecent. Wellington Channel (Belcher) : E. Greenland 

 (Mobius) : Spitzbergen (Torell, Eaton) : Arctic Exp., 6\- 

 15fms. (Feilden). 



I am now satisfied that A. Warhami of Hancock is not this 

 species, but the same as Crassina depressa of Brown = ^. cre- 

 hricostata, Forbes, = .4. Richardsoni^ Reeve. 



Necera subtorta, G. 0. Sars. 



Neeera suhtm-ta, G. 0. Sars, MS., Jeifr. in Ann. Nat. Hist. Dec. 1876, 

 p. 496. 



St. No. 3 (Feilden). 



Recent. Vadso (G. 0. Sars) : Bergen (Koren) : Hammer- 

 fest (M' Andrew) : Spitzbergen (Torell) : ' Lightning ' Exp., 

 550 fms. : 'Porcupine' Exp., 1869, 62-125 fras. : ' Vorin- 

 gen' Exp., 400 fms. (Friele) ! 



This pretty little shell differs from N. ohesa of Loven in 

 being not only much smaller, but more gibbous or swollen, 

 and in having a shorter and upturned rostrum, which appears 

 twisted when viewed edgewise. N. exigua is more slender 

 and delicate, besides being peculiarly sculptured. iV. jJeUucida 

 of Stimpson is distinct from any of the above. 



Saxicava rugosa, Linne. 

 Mytilus rugosus, Linn. Syst. Nat. ed. xii. p. 1156. 



St. No. 4 (Egerton) ; NoS. 6, 7, and 10 (Hart) ; No. 12 

 (Feilden). 



Recent. Probably in every sea throughout the world, from 

 the upper part of the laminarian zone to the line of soundings : 

 ' Bulldog ' Exp., 1622 fms. (fragment) : ' Lightning ' Exp., 

 170-550 fms.: 'Porcupine' Exp., 1869, 90-1230 fms.; 

 1870, Bay of Biscay, 20-717 fms. ; Mediterr., 25-92 fms. : 

 ' Valorous ' Exp., 3-60 fms. : Arctic Exp., 5|-30 fms. 

 (Feilden). 



