TANAIDACEA AND ISOPODA— TATTERSALL. 197 



Station 348. Feb. 13, „ Off Barne Glacier, McMurdo Sound, 200 fathoms (366 metres), 



Agassiz trawl. 

 „ 349. ,, 15, „ Off" Butter Point, Western shore of McMurdo Sound, 80 fathoms 



(146 metres). Agassiz trawl. 

 „ 355. Jan. 20, 1913, 77° 46' S., 166° 8' E., 300 fathoms (547 metres). Agassiz trawl. 

 ,, 356. ,, 22, ,, Off" Granite Harbour, entrance to McMurdo Sound, 50 fathoms 



(92 metres). Agassiz trawl. 

 North Bay, N. of Cape Evans, McMurdo Sound. 



IV.-DESCRIPTIONS OF SPECIES. 



Order TANAIDACEA. 

 Family TANAIDAE. 



Genus NOTOTANAIS, Richardson. 



1. Nototanais dimorphus (Beddard). 



Pamtanais dimorphus, Beddard, 1886 (1), p. 119; Beddard, 1886 (2), p. 130, pi. XVII, 

 figs. 1-8 ; Nototanais dimorphus, Richardson, 1906 (2), p. 3; Nierstrasz, 1913, p. 39; 

 Vanhoifen, 1914, p. 470; N. aiistralis, Richardson, 1908, p. 1, text-fig. 1. 



Occurrence. — Station 356, off Granite Harbour, entrance to McMurdo Sound, 

 50 fathoms, bottom fauna, one male, 4 mm. 



Remarks. — I am in complete agreement with Vanhoffen's opinion that Richardson's 

 species, N. aiistralis, is the same as that described earlier as N. dimorphus, by Beddard. 

 Beddard's type was not available for examination, but the specimen now recorded is in 

 the closest agreement with his description and figures, and I am quite unable to see any 

 important points of difference between N. diviorphus and N. aiistralis. 



Genus TANAIS, Audouin and Milne-Edwards. 



2. Tanais gracilis. Heller (?). 



T. gracilis. Heller, 1865, p. 133, pi. XII, fig. 3 ; Stebbing, 1905, p. 3, pi. I (D) ; Nierstrasz, 

 1913, p. 23; Vanhbffen, 1914, p. 468, text-figs. 6^-^. 



Occurrence. — Cumberland Bay, South Georgia, December, 1913, collected by 

 P. Stammwitz, one ovigerous female, 6 "5 mm. 



Remarks. — There is no male specimen in the collection, and in consequence my 

 identification must be accompanied by an expression of doubt. 



The question is further complicated by the asymmetry of the pleon. On the left 

 side the abdomen is distinctly composed of six somites, while on the right side only five 

 somites are visible, the articulation separating the fifth and sixth somites being- 

 incomplete and finishing in the mid-dorsal line. On the left side, therefore, this 

 specimen is a Tanais sensu lata, and on the right side a Tanais sensu stricto. It agrees 

 very closely with the description given by Vanhoffen of specimens from Kerguelen which 



