TETRAXONIDA 289 



Mycale lapidiformis (Ridley and Dendy). 



Esperella lapidiformis, Ridley and Dendy, 1886, p. 338; id., 1887, p. 64, pi. xv, figs. 2, 10, 

 pi. xvi, fig. 2. 



Occurrence. St. WS 248: Falkland Islands, 210-242 m. 



Distribution. Mouth of Rio de la Plata. 



Mycale acerata, Kirkpatrick. 



M. acerata, Kirkpatrick, 1907, p. 280; id., 1908, p. 36, pi. xx, fig. i, pi. xxiv, fig. 10; .1/. acerata, 

 var. minor, Hentschel, 1914, p. 63; M. acerata, Topsent, 1917, p. 63; Burton, 1929, p. 430. 



Occurrence. St. 42: South Georgia, 120-204 m.; St. 45: South Georgia, 238-27001.; St. 159: 

 South Georgia, 160 m.; St. 164: South Orkneys, 24-36 m.; St. 175: South Shetlands, 200 m. 



Distribution. Graham Land ; Victoria Land ; Wilhelm Land. 



Mycale tridens, Hentschel. 



M. tridens, Hentschel, 1914, p. 56, pi. v, fig. 6; Topsent, 1917, p. 63 ; Burton, 1929, p. 430. 



Occurrence, St. 170: Clarence Island, 342 m. ; St. MS 71 : East Cumberland Bay, South Georgia, 

 110-60 m. 



Distribution. Graham Land ; Victoria Land ; Wilhelm Land. 



Mycale macrochela, sp.n. (Plate LI, fig. 6). 

 Holotype. B.M. 28. 2. 15. 827. 

 Occurrence. St. 170: Clarence Island, 342 m. 



Diagnosis. Sponge lamellar with large oscules, up to 8 mm. in diameter and with 

 conspicuous membranous collar, scattered over one surface; surface even, minutely 

 hispid; texture firm, friable; colour, in spirit, dark greenish grey; skeleton a loose 

 reticulation of bundles of subtylostyli, with brushes of subtylostyli at surface; sub- 

 tylostyli 0-53 by 0-017 mm.; anisochelae 0-07, 0-035 ^^'^ 0-022 mm. chord; sigmata 

 o-i mm. chord; trichodragmata 0-035 mi^- long. 



Remarks. The species is remarkable for its plate-like external form and for the form 

 of the anisochelae. It resembles M. simonis, from South Africa, most closely in the form 

 of the anisochelae, but differs considerably from this species in all other respects. 



Genus Amphilectus, Vosmaer 



Amphilectus fucorum (Esper) (Plate LIV, figs. 1-4). 



Spongia fucorum, Esper, 1794, p. 278, pi. xlix, figs, i, 2; S. parasitica, Montagu, i8i8, p. 114; 

 Gray, 1821, p. 360; Grant, 1826, p. 348; Halichotidria parasitica, Flemming, 1828, p. 521; 

 Halispongia parasitica, Blainville, 1834, p. 532; Halichondria parasitica, Bellamy, 1839, p. 268; 

 Thompson, 1840, p. 254; H. fucorum, Johnston, 1842, p. 112, pi. ix, pi. xii, fig. 2; Isodictya 

 normani, Bowerbank, 1866, p. 320 ; /. fucorum, id., loc. cit., p. 322 ; /. alderi, id., loc. cit., p. 323 ; 

 /. edwardii, id., loc. cit., p. 325 ; /. paupera, id., loc. cit., p. 328 ; /. uniformis, id., loc. cit., p. 329 ; 

 /. clarkei, id., loc. cit., p. 330; /. gracilis, id., loc. cit., p. 331 ; /. normani. Gray, 1867, p. 534; 



