2g2 DISCOVERY REPORTS 



the spicules are: Thiele (Falkland Islands), styli o-225-o-26 by o-oi mm., chelae 

 o-o22mm.; Hentschel (Kerguelen), styU o-i85-o-276 mm., chelae o-oi9-o-022 mm.; 

 Br0ndsted (New Zealand), styh o-2-o-29 by o-ooy-o-ooS mm., chelae 0-025 mm. ; Dendy 

 (New Zealand), styli 0-3 by o-oi2 mm., chelae 0-028 mm. From this it is clear that 

 Stephens' Esperiopsis informis is also a synonym of Amphilectus fucorum. In addition to 

 those already referred to, I have found several small fragments of the same species 

 among the Terra Nova collections which came to my notice too late to be included in 

 my report on those collections. The distribution is thus extended to the Antarctic. 



Of the eight specimens in the present collection, three are typical in form, the first 

 (Plate LI V, fig. 4) being encrusting, the others (Plate LIV, figs. 1-3) massive with incipient 

 branching processes. Of the remaining five, one is small and massive, the rest are 

 large and massive, quite unlike anything hitherto recorded for the species. At the same 

 time, the structure of the skeleton in all the specimens is the same, and is identical with 

 that 'of the European forms of A. fucorum, and the size of the spicules very similar. 

 The latter is in some cases greater than any hitherto recorded for the species. The 

 dimensions are: styli 0-27-0-48 by 0-009-0-019 mm., the chelae 0-021-0-028 mm., the 

 figures representing the range of average spicule size for the eight specimens. 



There has been a tendency in the past to confuse Esperiopsis edwardii, var. amencana, 

 with the present species. I take the opportunity therefore to include a photograph of the 

 typical form of the variety (Plate LIV, fig. 5)- In all probability, E. rugosa and its var. 

 major are synonyms of this form, which I propose to regard as a separate species, 

 Amphilectus americanus (Ridley and Dendy), distinguished by its external form. 



Distribution. Europe; South Africa; Falklands; New Zealand; Antarctic. 



Amphilectus rugosus (Thiele). 



Esperiopsis rugosa, Thiele, 1905, p. 440, H- 5o; E. rugosa, var. major, Hentschel, 1914, P- 68; 

 Amphilectus rugosa, var. major. Burton, 1929, p. 430. 

 Occurrence. St. 6 : Tristan da Cunha, 80^140 m. ; St. WS 85 : Falkland Islands, 79 m- 

 Distribution. Calbuco, Chile; Victoria and Wilhelm Lands, Antarctic. 



Amphilectus flabellata, sp.n. (Plate LIII, fig. 5). 



Holotype. B.M. 28. 2. 15. 409. 



Occurrence. St. WS 88: Falkland Islands, 96-127 m. 



Diagnosis. Sponge massively flabellate, erect; surface uneven, minutely conulose, 

 hispid; oscules and pores not apparent; colour, in spirit, dark brown; skeleton a sub- 

 isodictyal, usually triangular and unispicular, reticulation with occasional multispicular 

 bands running irregularly through sponge; no special dermal skeleton; little or no 

 spongin; megascleres smooth styli, usually slightly curved, 0-285 by 0-009 mm. ; micro- 

 scleres palmate isochelae of usual type, 0-015-0-024 mm. long. 



Remarks. The holotype resembles Esperiopsis fucorum, and other allied species, in 

 the structure of the skeleton and in the size and shape of the spicules. It differs from 



