Mr. E. A. Smith on Arctic MoUusca. 141 



" in a mass of ice," has a second name attached to the tablet 

 on which it is placed — Lyonsia arctica^ Gray. Neither of 

 these names were ever published. 



The form described by Hancock appears to differ slightly 

 from h. arenosa of Moller ; for the iimbones are situated more 

 centrally, and consequently the anterior side is longer, as is 

 seen in Hancock's figure. In Beechey's ' Voyage,' on plate 43 

 (fig. 3), a shell is figured, which possibly is the identical one 

 collected by Ross ; for it is exactly the same size, although the 

 colour is different. 



Cardium islandicum^ Linn., 



Chemnitz, Conch. Cab. vi. pi. 19. f. 195; Gould, Invert. Mass. f. 58, 



(ed. 2) f. 450. 

 C. ciluitum, Fabricius, Fauna Groeul. p. 410. 



C. pubescens, Couthouy, Bost. Journ. Nat. Hist. 1838, ii. pi. 3. f. 6. 

 C. arcticum, Sowerby, Conchol. Illustr. f. 26. 

 C. icelandicum (Chemn.), Reeve, Conch. Ic. ii. f. 54. 



Hob. Dobbin Bay, 30 fms. {Hart). 



Axinus Gouldii'^j Philippi, 



Zeitschrift f. Malacozool. 1845, p. 74. 



Lucinajlexuosa, Gould, Invert. Mass. (ed. 1), p. 71, f. 52. 



Cnjptodon Oouldii, Invert. Mass. ed. 1870, p. 100, f. 406. 



Hah. Discovery Bay, 5^ fms. [Feilden). 



The shells associated with this species differ somewhat from 

 the description given by Gould in having, besides " the 

 widened groove," a lanceolate depression or posterior lunula 

 which extends from the umbones down the dorsal slope. It 

 is also very similar to A. croidinensis, Jeffreys. 



NuGula inflata^ Hancock, 



Ann. & Mag. Nat. Hist. 1846, xviii. p. 333, pi. v. f. 13, 14 ; Sowerby 's 

 Thesaurus, iii. pi. 229. f. 115, 116. 



Hah. Discovery Bay, 5^ fms. [Feilden). 



Leda j^ermda, Mliller, 



Hanley in Sowerby's Thes. Conch, iii. pi. 228. f. 56-58. 



" Area Martinii, Bolten ; Leda macilenta, Steenstrup and Moller ; 



Nucula rostrata, Mart., Lam. ; Nuculajluviatilis, Sowb." Morch, Mol. 



Greenland, p. 21. 

 Nuculana permda, Morch, /. c. 

 N. elo7igata, Daudin, teste Hanley. 



Hah. Discovery Bay, 5^ fms. (Feilden). 



