HEXACTINELLIDA 257 



Remarks. Of the two small specimens, the larger, 3 cm. high by 2 cm. in diameter, 

 has a distinct basal tuft; but the smaller, less than 5 mm. in diameter, has no recog- 

 nizable tuft and is fixed by the base to a Serpulid tube. 



Distribution. South Orkneys; Graham Land; Victoria Land; Wilhelm Land. 



Rossella villosa, Burton. 



/1;. villosa. Burton, 1929, p. 412, pi. iii. 

 Occurrence. St. 180: Palmer Archipelago, 160-330 m.; St. 190: Palmer Archipelago, 93-130 m. 



Remarks. There are two immature specimens, the largest 5 cm. high, which appear 

 to belong to this species ; but since the basalia are missing in each it is impossible to be 

 quite certain of the identification, especially as they resemble the young forms of 

 R. niida, Topsent, in many ways. 



Distribution. Victoria Land. 



Genus Gymnorossella, Topsent 

 Gymnorossella inermis, Topsent (Fig. 3 d-g). 



G. inermis, Topsent, 1916, p. 164; id., 1917, p. 22, pi. i, fig. i, pi. v, fig. 4; Burton, 1929, p. 413. 

 Occurrence. St. 181 : Palmer Archipelago, 160-335 m.; St. 190: Palmer Archipelago, 93-130 m.; 

 St. WS loi : Falkland Islands, 100-150 m.; St. WS 102: Falkland Islands, 50-100 m.; St. WS 225: 

 Falkland Islands, 162-161 m.; St. WS 250: Falkland Islands, 251-313 m. 



Remarks. The larger of the two specimens is 20 cm. high and both agree closely with 

 the holotype. The only point worth noting here is the variation in the angles of the rays 



Fig. 3. Showing variation in rays of pentactin, pleuralia and basalia: a, Rossella antarctica solida; 

 b, R. antarctica intermedia; c, R. antarctica antarctica; d-g, Gymnorossella inermis. 



of the pentactin basalia. In the larger specimen (from St. 181) these are all disposed 

 within an angle of less than 180° ; in the second specimen they vary a good deal, and 

 although in most of the basalia the rays are confined within an angle of less than 180°, 

 some are cruciform (Fig. 3 d-g) and there are all intermediates. 



Distribution. Graham Land. 



