A 



TETRAXONIDA 317 



arranged in linear series on ridge-like portions of surface, or at apices of lobular 

 outgrowths; pores apparently arranged generally over surface; texture compressible 

 but elastic ; colour, in spirit, very dark brown ; main ^^ ^,<y^ 

 skeleton an isodictyal reticulation of smooth styli | \ [ 

 forming multispicular primary fibres, about six spi- 

 cules thick, running vertically to surface, connected 

 at intervals by irregularly arranged single spicules; Fig. 28. SteMoryx discovereyi, sp.n. 

 dermal skeleton composed of irregular brushes of Examples of variation in ends of tor- 

 tornota arranged more or less at right angles to sur- ""^^' ' '°°°' 

 face; megascleres smooth, often slightly curved, styli, 0-225 by o-oo6 mm., and straight 

 tornota, with ends mucronate, strongylote or truncate and sparingly spined, occasionally 

 asymmetrical, 0-165 by 0-005 "^i"- ! microscleres, polydentate isochelae, with usually five 

 teeth, 0-035-0-045 mm. long. 



Remarks. The present species differs from the genotype in the absence of a pedicel 

 and the smaller size of the styli, from S. dcntata in having smooth styli, instead of 

 acanthostyli, from S. diversiancorata in having only one sort of isochela, and from 

 S. pliiridentata, which it most nearly resembles, in the smaller size of the isochelae. 



Genus Kirkpatrickia, Topsent. 



Kirkpatrickia variolosa (Kirkpatrick). 



Tedania variolosa, Kirkpatrick, 1907, p. 279; /(/., 1908, p. 32, pi. xxi, fig. i, pi. xxv, fig. i; 

 Kirkpatrickia variolosa, Topsent, 1912, p. 3. 



Occurrence. St. 149: South Georgia, 200-234 'ii-! St. 175: South Shetlands, 200 in.; St. WS 27: 

 South Georgia, 106-109 n^- 



Remarks. The specimens in life were coloured bright crimson or deep magenta red. 

 Distribution. Victoria Land. 



Kirkpatrickia coulmani (Kirkpatrick) (Plate LV, fig. 5). 



Tedania coulmani, Kirkpatrick, 1907, p. 280; /(/., 1908, p. 33, pi. xxi, fig. 2, pi. xxv, fig. 2; 

 Kirkpatrickia coulmani, Topsent, 19 12, p. 3. 



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



Remarks. The present specimen agrees closely with the holotype except that the 

 styles are entirely smooth. 



Distribution. Victoria Land. 



Genus Acheliderma, Topsent. 



The genus belongs obviously to the Myxilleae. Owing to Kallmann's (1920, p. 768) 

 diagnosis of Allocia, there appears, at first sight, to be some similarity between this 

 genus and Acheliderma. This is due to his having suggested the possibility of the 

 occurrence of toxa in forms, as yet undescribed, allied to the genotype of Allocia, 

 Spanioplon cheliferiim, Hentschel. It was probably the inclusion of the phrase " perhaps 



