TETRAXONIDA 287 



Diagnosis. Sponge irregularly massive, with large oscules, or sub-infundibular with 

 one side oscular, bearing oscules up to 2 mm. diameter, 

 and other side poral, thrown in irregular folds ; surface his- 

 pid, often verrucose; texture firm, compressible; colour, in 

 spirit, yellow to brown ; skeleton sub-isodictyal, with primary 

 fibres 12-20 spicules thick, secondary fibres loose or re- 

 presented by irregularly scattered single spicules; oxea 

 0-42 by 0-02 mm. ; chelae o-o6 mm. chord ; toxa up to 

 0-175 ^^- long. 



Remarks. The species, which is characterized mainly by 



the possession of toxa in addition to isochelae, shows a 



similar range in external form to that found in Haliclona 



bilamellata (see p. 267). The microscleres are very variable 



in their occurrence, the toxa are often very rare, and in one ^'8- '^- I^odictya toxoplnla, 

 1 ,, I 1 1 r 1 sp.n. Microscleres, x 300. 



specimen no microscleres at all could be round. 



Genus Guitarra, Carter 

 Guitarra fimbriata, Carter. 



(For synonymy see Burton, 1929, p. 426.) 



Occurrence. St. 39: South Georgia, 179-235 m.; St. WS79: Falkland Islands, I3i-i32m.; 

 St. WS86: Falkland Islands, i5i-i47m.; St. WS 223 : Falkland Islands, 114 m.; St. WS 243 : 

 Falkland Islands, 144-141 m. 



Distribution. Arctic, Atlantic and Antarctic; Indian Ocean; New Zealand. 



Genus Cercidochela, Kirkpatrick 



Cercidochela lankesteri, Kirkpatrick. 



C. lankesteri, Kirkpatrick, 1907, p. 284; id., 1908, p. 42, pi. xix, fig. 5, pi. xxiii, fig. 5 ; Hentschel, 

 1914, p. 74; Burton, 1929, p. 426, pi. v, fig. 8. 



Occurrence. St. 187: Palmer Archipelago, 259 m. 

 Distribution. Victoria Land ; Wilhelm Land. 



Genus Plumocolumella, Burton 



Plumocolumella maeandrina (Kirkpatrick). 



Desmacidon maeandrina, Kirkpatrick, 1907, p. 282 ; id., 1908, p. 40, pi. xix, fig. 4, pi. xxiii, fig.4 ; 

 Plumocolumella maeandrina, Burton, 1929, p. 425. 



Occurrence. St. 27: South Georgia, no m.; St. 42: South Georgia, 120-204 m.; St. 123: South 

 Georgia, 160 m.; St. 148: South Georgia, 132-148 m.; St. 149: South Georgia, 200-234 m.; St. 158: 

 South Georgia, 401-411 m.; St. WS 27: South Georgia, 106-109 m.; St. WS 33: South Georgia, 

 130 m. 



Distribution. Victoria Land. 



7-2 



