360 DR JAMES COSMO MELVILL AND MR ROBERT STANDEN ON THE 
Hab.—Deposit No. 38, dredged March 18, 1904, lat. 71° 22’S., long. 16° 34’ W., 
1410 fathoms. Station 417. 
A small, tumid, smoothish, slightly imequilateral Yoldia, the anterior side 
rounded, the posterior somewhat produced, to which Y. (Sarepta) abyssicola, Smith,* 
from Station 246, Challenger Expedition, Mid North Pacific, at 2050 fathoms, and also 
Station 281, Mid South Pacific, at 2885 fathoms, seems somewhat allied. ‘That species, 
however, appears more distinctly abbreviate posteriorly, and higher in proportion 
to its width. Y. ecaudata, Pelseneer,t may likewise be compared, a species which 
is closely akin to Y. abyssicola. This was obtained during the voyage of the 
Belgica in the Antarctic region, at a depth of 400-500 metres. Again, Y. Valetter, 
Lamy, from the South Orkneys, where an example was found in the stomach of a penguin, 
is much of the same outward form, but less than half the dimensions (2°2 x 1°65 x 1°5 mm.), 
and the teeth are only six in number on either side. The epidermis is likewise named 
as ‘‘flava” in contradistinction to “‘ plumbea” or “ olivacea.” 
Nucula pisum, Sowb. 
Nucula pisum, Sowerby, Thes. Conch., iii. p. 153, pl. ecxxix. fig. 133. 
Hab.—Falkland Islands, local, but gregarious. Station 118. 
Order FILIBRANCHIATA. 
Sub-order aRCACEA. 
Family Arcide. 
Arca (Bathyarca) strebeli, M. and St. 
Arca (Bathyarca) strebeli, Melvill and Standen, Yrans. Roy. Soc. Edin., vol. xlvi., 
part 1., p. 144, pl. figs. 13, 13a (1907). 
Hab.—Two additional localities can be now given, as follows :— 
Station 420. Dredged at 2620 fathoms. One specimen. 
» 291. Lat. 67° 33’S., long. 36° 35’ W., 2500 fathoms, March 7, 1903. 
Inmopsis longipilosa, Pels. 
Limopsis longipilosa, P. Pelseneer, Voy. du S.Y. “ Belgica” : Zoologie, p. 25, figs. 89, 90 (1903). 
Hab.—Dredged in lat. 71° 22’ §., long. 16° 34’ W., at 1410 fathoms, March 18, 
1904. Station 417. 
One fairly perfect specimen, probably referable to the above. 
[Very imperfect examples of another Limopsis, solid, small, equilateral, covered 
with thin, short-bristled epidermis, also occurred at Burdwood Bank, 50 fathoms. | 
* Rep. Challenger Expedition, “ Lamellibranchia,” pl. xx. figs. 6, 6a, 6b. 
+ Voy. du S.Y. “ Belgica” : Zoologie, par PAUL PELSENEER, p. 22, figs. 77, 78 (1903). 
