H4 



DISCOVERY REPORTS 



Stebbing, 1906, p. 206. 



Family COLOMASTIGIDAE 

 Genus Colomastix, Grube. 



Stebbing, 1906, p. 206. 

 Chilton, 1921 a, p. 60. 

 Barnard, 1925, p. 346. 

 Chevreux and Fage, 1925, p. 144. 

 Schellenberg, 1926, p. 324. 



When Schellenberg described his new species it seemed justifiable to regard Walker's 

 (1907) record of pus ilia and Chilton's (1912) record of brazieri, from McMurdo Sound 

 and the South Orkneys respectively, as being referable to fissilingua, Schell. But the 

 discovery of a further species from Antarctic waters makes it a little uncertain, without 

 re-examination of the specimens, to what species they did really belong. One can, how- 

 ever, feel confident that they are neither pusilla nor brazieri. 



In retracting my opinion (1925) that brazieri would eventually be united -with pusilla, 

 I fully concur with Schellenberg that when abundant material from many localities has 

 been properly examined, pusilla itself will be broken up into more than one species. 

 The real shape of the telson of brazieri is still unknown. 



Colomastix fissilingua, Schell. (Fig. 63). 



Schellenberg, 1926, p. 324, fig. 42; 193 1, p. 114. 

 ? Walker, 1907, p. 38 (pusilla, non Grube). 

 ? Chilton, 19 1 2, p. 484 (brazieri, non Haswell). 

 Occurrence: 1. St. 39. South Georgia. 13 $$ (3 ovig.) 2-5-4 mm. 



2. St. WS 27. South Georgia. 1 3 1 3 mm., 1 juv. 2 mm. 



Remarks. In fissilingua we have a species undoubtedly distinct from pusilla; the 

 telson alone is a sufficient distinction. The present specimens agree with Schellenberg's 

 description. I give some figures, however, including one of gnathopod 2 in $. The 



£Tf<£=3- 



Fig. 63. Colomastix fissilingua, Schell. a. Telson and uropods 2 and 3, with apex of telson and inner margin 

 of inner ramus of uropod 3 further enlarged, b. Uropod 1. c. Maxilliped. d. Maxilla 1. e. Maxilla 2. 

 /. Side-plates 1-7, with gnathopod 2 (?), peraeopods 1 and 3, and 6th joint of peraeopod 3 further enlarged. 



