TETRAXONIDA 327 



Hymedesmia simillima, var. antarctica, Hentschel. 

 H. simillima, var. antarctica, Hentschel, 19 14, p. 112. 

 Occurrence. St. WS 33 : South Georgia, 130 m. ; St. WS 225 : Falkland Islands, 162-161 m. 



Remarks. There is a slight difference from the holotype in the curvature of the shafts 

 of the chelae. 



Distribution. Wilhelm Land. 



Hymedesmia longurioides, sp.n. (Fig. 33). 



Holotype. B.M. 28. 2. 15.468. 



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



Diagnosis. Sponge thinly encrusting; surface smooth, even; 

 oscules in form of low chimney-like chones; pores not 

 apparent; colour, in spirit, white; main skeleton composed of 

 acanthostyli of two sizes ; dermal skeleton an irregular tangential 

 layer of tornota; large acanthostyli almost entirely spined, with 

 swollen base, 0-35 by o-oi6 mm.; small acanthostyli entirely 

 spined, 0-105 by o-oo8 mm.; dermal tornota smooth, straight, 

 sharply but abruptly pointed at each end, 0-32 by 0-007 nfin^i- 



Remarks. The acanthostyli are apparently divided into two 

 distinct categories with occasional intermediates. The surface 

 of the sponge bears a number of low chimney-like chones, but 

 whether these are poral or oscular, or both, it is difficult to say. 



The species bears a resemblance to H. longurius, Lundbeck, 

 but differs in the characters of the tornota. 



Section CRELLEAE 



Genus Crella, Gray 

 Crella crassa (Hentschel). 



Grayella crassa, Hentschel, 1914, p. 95, pi. vii, fig. 3. 

 Occurrence. St. 175: South Shetlands, 200 m. 



Distribution. Wilhelm Land. 



a 



Fig. 33. Hymedesmia 

 longurioides, sp.n. a, der- 

 mal tornote; b and c, 

 acanthostyli. x 300. 



Genus Crellina, Hentschel 

 Crellina tubifex, Hentschel. 



C. tubifex, Hentschel, 1914, p. no, pi. iv, fig. 12, pi. vii, fig. 14. 

 Occurrence. St. 175: South Shetlands, 200 m. 



Distribution. Wilhelm Land. 



