KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. N:O 4. 143 



IMi;ilMl;iimiiiii;i abyssonim SARS. var. roblista n. 



Tab. XII, figg. 430431. 



As far as I am aware of, the type form has not been described except in a short no- 

 tice in the last Edit, of GRIFFITHS and HENFREY'S Micrograph. Dictionary, and in Des- 

 cript. Catalogue of objects from Deep-sea dredgings exhibited at the Soiree of the 

 Roy. Microscop. Soc. Kings College 1870, by W. B. CARPENTER. 



Our form has a very brittle test, composed entirely of siliceous sandgrains. Its 

 body displays at the roots of its 3 or 4 arms a tendency to swelling, corresponding 

 to the swelling or bulb in the early stage of Hyperammina. The arms radiate in the 

 same plane, tapering gradually at their ends, which are furnished with a central, nar- 

 row and round aperture. 



It is scantily met with in the coralline-gravel attaining a length of 16 mm. 



Fig. 430: Three-armed specimen. 



Fig. 431: Four-armed. 



Syn. Rhabdammina abyssorum. SARS., 1868, Fortsatte Bemperkning. over det clyriske Livs Utbredning i 



Havets Dybder; Christiania Vid. Selsk. Forhandl. 1868, p. 248 (nee 

 descripta nee delineata). 



Appendix. 



Syn. Rhabdammina linearis BRADY, 1879, Retic. Rhizop. Challenger-Exp.; Quart. Journ. microsc. sc. 73, 



p. 37, t. 3, figg. 1011. 



Jaculella acuta BRADY. 



Tab. XII, fig. 432. 



Provisionally I refer our form to this species although not convinced either as 

 to the true nature of these organisms or of their identity. Ours is slender with a 

 very narrow channel, which here and there exhibits very faintly traces of septa. 



It is not common in the coralline-gravel. 



Syn. Jaculella acuta BRADY, 1879, Reticul. Rhizopod. Challenger-Exped.; Quart. Journ. microsc. 



sc. 73, p. 35, t. 3, figg. 1213. 



