MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 135 



Sub-order MYTILACEA. 



Family Mytilidse. 

 Philobrya sublsevis, Pels. 



Philobrija sublxvis, P. Pelseneer, Voy. du S.Y. " Belgica" : Zoolocjie, p. 25, figs. 93, 94 (1903). 

 //6. Station 346, lat. 54 25' S., long. 57 32' W., at 56 fathoms, January 1, 

 1903. 



Philobrya ivandelenxis, Lamy. 



I'hilobrya wandelensis, E. Lamy, Ky.ped. Antarct. Franfaise Charcot, 1903-5, p. 16, pi. i. 

 figs. 15, 16 (1906). 



Hob. Trawl, Burdwood Bank, 56 fathoms. Station 346. 



Crenella decussata, Mont. 



Mytilus decussatus, Montagu, Test. Brit. Suppl., p. 69 (1809). 



,, Forbes and Hanley, ii. p. 210, pi. xlv. fig. 2. 



Crenella Jeffreys, Brit. Conch., ii. p. 133, V., pi. xxviii. fig. 6. 



,, Sovverby, 111. Index Brit. Shells, pi. vii. fig. 17. 



Hab. Burdwood Bank, south of the Falkland Islands, at 56 fathoms, December 1, 

 1903. Station 346. 



Very minute specimens, not exceeding 2x2 mm., the interior beautifully pale- 

 nacreous ; form precisely that of the European and Canadian type, the divaricating 

 sculpture seemingly also identical, as well as the fine marginal crenellations. 



Modiolarca mesembrina, M. and St. 



Modiolarca mesembrina, Melvill and Standen, Trans. Roy. Soe. Edin., vol. xlvi., part i., 



p. 146, pi. figs. 15, 15a (1907). 

 Modiolarca picturata, Cooper and Preston, Ann. and Mag. N. Hist., ser. viii , vol. v., pi. iv. 



fig. 5 (1910). 



Hab. Falkland Islands. Station 118. 



We received lately from Mr A. P. COBB examples of M. picturata, Cooper and 

 Preston, and consider it the same as our mesembrina, from the same locality, described 

 three years previously. In marking and coloration it is a most variable species : in 

 form it is fairly constant. 



Order EULAMELLIBRANCHIATA. 

 Sub-order SUBMYTILACEA. 

 Family Carditidse. 



Carditella pallida, Sm. 



Carditdla pattida, E. A. Smith, Proc. Zool. Soc. Land., p. 43, pi. v. figs. 9, 96(1881). 

 var. duodecim-costata, nov. (Plate, figs. 19, 19a). 



Hab. Station 346, Burdwood Bank, at 56 fathoms. Many full-grown specimens, 

 but few perfect. 



(ROT. soc. EDIN. TRANS., VOL. XLVIII., 361.) 



