2 E. KIKKPATRICK. 



I.-HEXACTINELLIDA. 



(7 Plates.) 



The Hexactinellid Sponges, comprising thirty-four specimens and sixteen macerated 

 fragments, all belong to one Family, the Rossellidse. The specimens represent five 

 genera, of which three are new, and ten species, of which eight have not been described 

 before. The following is a list of species with depths and localities : — 



FAMILY EOSSBLLID^, F. E. Schulze. 

 (Sub-Family Rossellin.'E, F. E. Schulze.) 



1. Hyalascus hodgsoni. Off Mount Terror, 914 metres (.500 fathoms). 



2. Rossella antarctica Carter. "W.Q., 238 m. (130 fms.). 



3. Rossdla podagrosa. W.Q., 18-55 m. (10-30 fms.). 



4. Rossella racovitzce Topsent. W.Q., 18-3G m. (10-20 fms.). 



5. Rossella hexactinopMla. Antarctic Circle, Long. 155° 21' E., 404 m. (254 fms.). 



6. Aulorossella pilosa. Off Coulman Island, 183 m. (100 fms.). 



7. Aulorossella levis. W.Q., 18-325 m. (10-178 fms.). 



8. Aulorossella longstaffi. W.Q., 238 m. (130 fms.). 



9. Anaulosoma schulzii. W.Q., 36-75 m., (20-41 fms.). 



Sub-Family Lanuginellin^, F. E. Schulze. 



10. Anoxycalyx ijimai. W.Q., 329 m. (180 fms.). 



Two species in the above list have been described before : one of these, Rossella 

 antarctica Carter (2, p. 114), was dredged by Sir James Clark Ross in Lat, 74° 30' S. 

 Long. 75° E., 549 m. (300 fms.), during the voyage of discovery to the Antarctic 

 Regions in 1839-43 ; the other, Rossella racovitzse Topsent (11, p. 33), was obtained in 

 1897-99 by the 'Belgica' from Lat. 70°-7l° S., Long. 80°-87° W., 450-569 m. 

 (267-310 fms.). 



To the one species previously known from the Antarctic, the ' Belgica,' dredging 

 in Lat. 70°-71° S., Long. 80°-89° W., added the following nine :— 



1. ? Caulophacus sp. 450 m. (24G fms.). 



2. Rossella nuda Topsent. 430 m. (235 fms.). 



3. Rossella racovitzm Topsent. 450-569 m. (246-311 fms.). 



4. Bathydorus spinosus P. E. Schulze. 569 m. (311 fms.); also from Penguin Island, 2926 m. 



(1600 fms.) ['Challenger ']. 



5. Rhaldocalyptus ausfralis Topsent. 450 m. 



6. Farrea occa (Bowerbank) Carter. 450 m. 



7. JSiirefe yerlachei Topsent. 450-550 m. (246-301 fms.). 



8. Chotielasma sp. 450-500 m. (240-273 fms.). 



9. Uncinatera jilicata Topsent. 430-500 m. (235-273 fms.). 



All of the eighteen Antarctic species belong to the Hexasterophora, not one 

 representative of the Amphidiscophora having been found hitherto. 



In connection with bathymetrical distribution it is interesting to note that 

 specimens of four of the species obtained by the ' Discovery ' come from comparatively 

 shallow water, from depths ranging from 18-75 m. (10-41 fms.). 



