3i8 DISCOVERY REPORTS 



sometimes accompanied by toxa," in his diagnosis, that caused Kallmann to overlook 

 the obvious affinity of S. cheliferum with Ectyodoryx, which Hentschel (191 1, p. 363) 

 himself had suggested. 



Acheliderma topsenti, sp.n. (Plate LIV, figs. 7-9). 



Holotype. B.M. 28. 2. 15. 393. 



Occurrence. St. 160: near Shag Rocks, 177 m. 



Diagnosis. Sponge small, flabello-digitate ; surface uneven, hispid ; oscules and pores 

 not apparent; texture tough; colour, in spirit, yellow; skeleton a sub-isodictyal reticula- 

 tion of styli, with main fibres semi-plumose, echinated by acanthostyles ; a confused 

 layer of tornota occurs in dermis and tornota are found sparingly associated with main 

 skeleton ; main skeleton contains a small amount of spongin ; microscleres, isochelae 

 palmatae and toxa; styli of main skeleton, long, smooth, but bearing a few feeble spines 

 at base, slightly curved, 0-42 by 0-009 mm. ; acanthostyli, slightly curved, regularly and 

 sparingly spined throughout length, 0-15 by 0-007 mm. ; tornota, smooth, straight, 

 truncate, bearing a crown of a few spines at each end, 0-225 t»y 0-003 ^^^- > isochelae 

 palmatae, 0-021 mm. long; toxa long, smooth, ends not spined but ending in a sharp 

 point, 0-06-0-48 by 0-007 "fi"^- 



Remarks. The present species difi^ers from the genotype, A. lemmscata, Topsent, 

 from the North Atlantic, in the longer toxa and in possessing isochelae instead of 

 raphides. Otherwise the two species agree very closely in spiculation. 



Genus Inflatella, Schmidt 



Inflatella belli (Kirkpatrick). 



(For synonymy see Burton, 1929, p. 439.) 



Occurrence. St. WS83: Falkland Islands, 137-129 m.; St. WS248: Falkland Islands, 210- 

 242 m. 



Distribution. Victoria Land ; Wilhelm Land ; New Zealand. 



Section PLOCAMIEAE 



Genus Plocamia, Schmidt 



Plocamia gaussiana, Hentschel. 



Plocamia gaussiana, Hentschel, 1914, p. 120, pi. viii, fig. 5; Burton, 1929, p. 435. 



Occurrence. St. 42: South Georgia, 120-204 m.; St. 148: South Georgia, 132-148 m.; St. 159: 

 South Georgia, 160 m.; St. 160: Shag Rocks, 177 m.; St. 175: South Shetlands, 200 m.; St. WS 42: 

 South Georgia, 198 m. 



Remarks. Except that the chelae seldom exceed 0-03 mm. length, and that tricho- 

 dragmata, measuring 0-03 x o-oo6 mm., are present in small quantities, this specimen 

 is quite typical. 



Distribution. Wilhelm Land; Victoria Land. 



