314 DISCOVERY REPORTS 



Ectyodoryx antarctica (Hentschel). 



Lissodmdoryx antarctica, Hentschel, 1914, p. 102, pi. vii, fig. 9; Burton, 1929, p. 399. 

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



Remarks. The present specimen agrees with Hentschel's holotype from the Ant- 

 arctic in external form, in the shape of the acanthostyh and tornota, and, fairly closely, 

 in the dimensions of the spicules. It differs in the presence of small, echinating acantho- 

 styh, and in the somewhat broader shape of the chelae. The dimensions of its spicules 

 are: large acanthostyh 0-195 t>y 0-012 mm., echinating acanthostyh 0-09 by o-oo6mm., 

 tornota o-i8 by 0-004 mm., larger chelae o-02i mm., smaller chelae 0-013 mm., sigmata 

 o-oi8-o-025 mm. 



As regards the presence of the echinating acanthostyh, there is a specimen from 

 McMurdo Sound, in the British Museum collection, which I had identified as a per- 

 fectly typical example of L. antarctica. On re-examination, however, this was found to 

 have echinating acanthostyh also, but they were rather rare, and I had overlooked them 

 in my first examination. Possibly therefore the holotype of the species may also 

 possess echinating acanthostyles which were overlooked by Hentschel. 



The dimensions of the spicules in the McMurdo Sound sponge are: large acantho- 

 styh 0-24 by 0-004 mm., echinating acanthostyh 0-15 by 0-009 mm., tornota 0-189 by 

 0-006 mm., larger chelae 0-026 mm., smaller chelae 0-018 mm., sigmata 0-02-0-03 mm. 

 This specimen thus approximates more closely to that described by Hentschel in the 

 dimensions of its spicules. 



Assuming that the species rightly belongs to Ectyodoryx, we may say that it has con- 

 siderable resemblance to Ectyodoryx (Myxilla) compressa (Ridley and Dendy) and, to a 

 lesser extent, to Ectyomyxilla kerguelensis, Hentschel. 



Distribution. Wilhelm Land ; Victoria Land. 



Ectyodoryx frondosa (Ridley and Dendy), var. anacantha, Hentschel. 



E.frondosa, var. anacantha, Hentschel, 1914, p. 107, pi. iv, fig. 11, pi. vii, fig. 12. 

 Occurrence. St. 190: Palmer Archipelago, 93-130 m. 

 Distribution. Wilhelm Land. 



Ectyodoryx ramilobosa (Topsent). 



Dendoryx ramilobosa,Topsent, igiG.p. 167; id., 1917, p. 47, pi. iii, fig. 3- P'- vi, fig- 6; Ectyo- 

 doryx ramilobosa. Burton, 1929, p. 399. 



Occurrence. St. 159: South Georgia, 160 m. 



Remarks. It will probably be found, when a comprehensive survey of the various 

 species of Myxilleae is made, that this species differs generically from the other species 

 of Ectyodoryx. The columns of smooth, basally spined styli, echinated abundantly by 

 similar but smaller styli, probably constitute a feature worthy of generic distinction. 



