2 Herman Friele. 



Size: L 8. B. 10 mm . 



Hab:, cold area St. 31,418 f.; 33,510 f.; 48,290.f. & 87, 488 f. 

 Dr. Jeffreys has informed me of its being met with by the 

 „Lightning" Expedition in 1868, between Scotland and the Faroe- 

 isles (550 f.) and by the „Porcupine" Expdn. of 1869, in the same 

 sea, at depths of 155, 290, 345 and 362 f. 



This peculiar arctic deep -sea- form is most allied to A. sul- 

 cata, but differs, in having a more angular form, a proportionably 

 more delicate structure and a narrower hinge-plate. 



Area Frie lei Jeff. 



Form triangular, umbones and central parts swollen; posterior 

 margin broad and rounded, the front-line runs nearly straight 

 towards the hinge-line, forming with it an acute-angle, the top 

 of which is obtuse and rounded; hinge, 3 teeth in front and 3 

 behind ; the former are set obliquely, and the latter paralel to the 

 hinge-line; structure close-set concentric striæ, and from the um- 

 bones transverse ribs radiate, appearing more conspicuous in front, 

 and along the posterior margin ; epidermis brown, hispid; the hairs 

 are comparatively rough, running in line with the transverse ribs. 



Size : L 3, 4. B. 7, 4. Diameter 2 mm . 



Hab: cold area St. 40, 1180 f; 51, 1130 f. and 53, 1500 f. 

 It occurred also in the „Porcupine" Expdn. 



Malletia cuneata Jeff. Ann. & Mag. o. nat hist. Novbr. 1876. 



Hab: cold area. St. 52, 1800 f. 



Pecten fragilis Jeff. Ann. & Mag. o. nat. hist Novb. 1876. 



Hab. cold-area St. 35, 1050 f ; 40, 1180 f. 51, 1130 f. & 53, 

 1500 f. 



As was the case in the „Valorous" Expdn., living or complete 

 specimens did not occur, but numerous fragments were obtained 

 at several stations, and surpassed greatly in size, any that occurred 

 in the English Expedition 



This form seems to be a genuine deep-seaform , inhabiting 

 the cold area, and in bathymetrical direction 1000 fathoms and below. 



Pilidium commodum Midd. (Sib. Reise) Pil i sc us pr ob us 

 Lov (Øvers. Vet Akad. Forh. 1859) 



One living specimen occurred on the eastern slope, on the 

 banks off Iceland - St. 48, 290 f. 



This species is liable lo no small variation, on account of 

 its horny and, when in a living state, nearly soft shellsubstantiality. 

 Our form is considerably more depressed than the typical one, and at 





