494 Dr. J. Gwjn Jeffreys on 



sizes, from half a line to an inch in diameter, which I dredged 

 in the ' Porcupine ' Expedition, off the north-west of Ireland, 

 at depths of 1230 and 1630 fathoms. A very young livirig 

 specimen of Gyprina Islandica I got in the same locality in 

 808 fathoms. 



The fry of /. cor was described by Professor Edward Forbes 

 as Kellia ahyssicola, by Dr. Philippi as Venus ? miliaris, and 

 by Professor M. Sars as Kelliella ahyssicola. 



Corbulidse. 



Poromya rotimdata*^ Jeffr. 



Shell convex, not very thin, nearly circular except at the 

 upper part of the posterior side, where there is a blunt angle, 

 formed by the junction of the dorsal side with that part, white, 

 covered with numerous minute and close-set tubercles, which 

 are arranged in longitudinal rows. The hinge is wanting. 

 Inside glossy. 



Station 12, 1450 fms. ; an imperfect valve. 



PeccMolia ahyssicola, M. Sars. 



Lyonsiella ahyssicola, M. Sara, Vid.-Selsk. Forh. 1868, p, 257. 

 PeccMolia ahyssicola, G. 0. Sars, ' On some remarkable Forms of Animal 



Life from the great deeps of the Norwegian coast,' i. p. 25, pi. iii. 



f. 21-43. 



Station 12, 1450 fms. ; a fragment only. Loffoden Isles, 

 200-300 fms. (Gr. O. Sars). Bergen (Koren). Greenland 

 (Mus. Copenhagen). Davis Strait, 200 fms. (Lindahl). ' Por- 

 cupine ' Expedition, 1870, chops of the English Channel, 

 567 fms. ; coast of Portugal, 740-1095 fms. 



PeccMolia gibbosa^, Jeffr. 



Shell rather solid, obliquely raised and truncated on the 

 posterior side, of a dark brownish colour, covered with nu- 

 merous minute and close-set tubercles, which are irreguhirly 

 disposed ; inner layer and surface of the inside nacreous. 



Station 12, 1450 fms. ; a fragment only. 



PeccMolia tornata\, Jeffr. 



Shell, although represented by several fragments, must 

 have been rounded, and larger than any known living species 

 except P. acuticostata. The present species, however, has no 

 ribs, but merely minute and irregularly scattered tubercles. It is 



* Rounded. t Irregularly hunchbacked. 



X Rounded off. 



