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 bj Hancock appears to differ slightly 

 from L. arenosa of Moller ; for the limbones 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. 2j f. 450. 

 C. ciliatum, Fabricius, Fauna Groenl. p. 410. 

 C. pubescens, Couthouy, Best. Journ. Nat. Hist. 1838, ii. pi. 3. f. G. 

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

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



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



Axinus Gouldiil^ Philippi, 



Zeitschrift f. Malacozool. 1845, p. 74. 



Lucinajlexuosa, Gould, Invert. 5lass. (ed. 1), p. 71, f. 52. 



Cryptodon Go^Mii, 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 lunule 

 which extends from the umbones down the dorsal slope. It 

 is also very similar to A. croulinensis, Jeffreys. 



Nucula. injlataj Hancock, 



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

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



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



Leda pernulaj Miiller, 



Hanley in Sowerby's Thes. Conch, iii. pi. 228. f. 5t>-58. 



" Area Martinii, Bolten ; Leda maetlmta, Sleenstrup and Miiller ; 



Nucula rosirata, Mart., Lam. ; Nucula Jluviatilis, Sowb." Morch, Mol. 



Greenland, p. 21. 

 Nuculana penudn, Mcirch, /. c. 

 N. elongata, Daudin, teste Ilanley. 



Hah. Discovery Bay, 6\ fms. {Feilden). 



