TETRAXONIDA 315 



Until it is possible to know more concerning the variations in skeletal structure found 

 in this group, however, it would be unwise to insist on such distinction. 



Distribution. Victoria Land ; Graham Land. 



Genus Anchinoe, Gray. 



Anchinoe latrunculioides (Ridley and Dendy). 



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



Occurrence. St. 156: South Georgia, 200-236 m. ; St. 159: South Georgia, 160 m.; St. 160: Shag 

 Rocks, 177 m.; St. WS 84: Falkland Islands, 75-74 m.; St. WS 243 : Falkland Islands, 144-141 m. 



Distribution. Graham Land; Victoria Land; Wilhelm Land; east coast of South 

 America, up to mouth of Rio de la Plata ; South Africa. 



Anchinoe areolata (Thiele). 



Hytnedesmia areolata, Thiele, 1905, p. 452, figs. 23, 68 ; Kirkpatrick, 1908, p. 24, pi. xxii, fig. 3 ; 

 Burton, 1931, p. 519, pi. i, fig. i, text-fig. 3. 



Occurrence. St. 152: South Georgia, 245 m.; St. 157: South Georgia, 970 m.; St. 160: Shag 

 Rocks, 177 m. 



Distribution. Calbuco ; Victoria Land. 



Anchinoe leptochela (Hentschel) (Plate LIV, fig. 11). 



Hymedesmia leptochela, Hentschel, 1914, p. 115, pi. viii, fig. 2. 

 Occurrence. St. 42: South Georgia, 120-204 m. ; St. 159: South Georgia, i6o m. 



Remarks. It is a natural suspicion that many of the species of Hymedesmia may 

 eventually prove to be the encrusting, possibly immediate post-fixation stages, of other 

 species of Myxilleae. This, at all events, appears to be the case with H. leptochela, 

 Hentschel. The holotype formed a thin encrustation on foreign bodies (Fremdkorper), 

 and had a smooth surface with a low papillate oscule. The skeleton showed the usual 

 Hymedesmia structure. The present specimens range from encrusting to massive, always 

 growing on fragments of rock, often incorporating much foreign matter in their sub- 

 stance, and bear a number of papillate oscules. The spicules are almost identical with 

 those of the holotype, but are arranged as in Anchifioe. 



There is no obvious reason why the skeleton in the immediate post-fixation stage of 

 an Anchinoe should not consist of acanthostyli set at right angles to the substratum, with 

 their bases planted thereon, nor why, as growth proceeds, the acanthostyli should not 

 be rearranged to form the ascending fibres, cored by tornota and echinated by acantho- 

 styli, of a typical Anchinoe. 



Distribution. Wilhelm Land. 



