TETRAXONIDA 

 Bubaris murrayi, Topsent. 



B. murrayi, Topsent, 1913, p. 616, pi. iii, fig. i. 

 Occurrence. St. 6: Tristan da Cunha, 80-140 m. 



Remarks. It is probable that this species is synonymous with B. vermiculata. 

 Distribution. Gough Island. 



Genus Ceratopsis, Thiele 



Ceratopsis incrustans, sp.n. (Fig. 38). 



Holotype. B.M. 28. 2. 15. 435. 



Occurrence. St. 6: Tristan da Cunha, 80-140 m. 



Diagnosis. Sponge encrusting; surface even, minutely 

 conulose; oscules and pores not apparent; texture soft, com- 

 pressible; colour, in spirit, grey; skeleton a multispicular sub- 

 isodictyal reticulation of styli of two sizes, larger 0-48 by 

 0-015 mm. and smaller 0-3 by o-oo6 mm.; microscleres, 

 toxiform microxea, o-i by 0-004 mm., scattered throughout 

 choanosome. 



Remarks. The species differs from all previously known 

 members of the genus Ceratopsis in the dimensions of its 

 spicules and in its external form. 



335 



Genus Eumastia, Schmidt 

 Eumastia attenuata, Topsent. 



E. attenuata, Topsent, 1915, p. 35, figs, i, 2. 

 Occurrence. St. 53 : Falkland Islands, 0-2 m. 



Distribution. Falkland Islands. 



\ 



Fig. 38. Ceratopsis incrus- 

 tans, sp.n. a, large style; b, 

 small style; c, c' , toxiform 

 microxeote. a, b and c, 

 X 200; c' , X 400. 



Family CLAVULIDAE 



Genus Suberites, Nardo 



Suberites montiniger. Carter. 



S. montiniger. Carter, 1880, p. 256; Vosmaer, 1882, p. 31, pi. i, fig. 26, pi. iv, figs. 137-139; 

 Topsent, 1892, p. 130; Lambe, 1894, p. 128, pi. iv, fig. 4; Swartschewsky, 1906, p. 319, pl.xiii, 

 fig. 4; Topsent, 191 5, p. 39; Pseudosuberites montiniger, Hentschel, 1916, p. 6; Suberella 

 topsenti, Burton, 1929, p. 446, pi. iv, fig. 5. 



Occurrence. St. WS 239: Falkland Islands, 196-193 m. 



Remarks. Since writing my Terra Nova Report, I have had occasion to examine a 

 number of specimens of S. montiniger, Carter, from the northern hemisphere and am 



13-2 



