LYSIANASSIDAE SI 



Tryphosa adarei, Wlkr. (Fig. 15). 



Walker, 1903, p. 49, pi. viii, figs. 38-44. 

 Barnard, 1930, p. 326. 



Occurrence: St. 175. South Shetlands. 2 S<S 15 and 21 mm., 1 ? 14 mm., 4 immat. 10-12 mm. 



Remarks. Pleon segment 3 with postero-inferior angle quadrate; segment 4 with the 

 dorsal carina rounded. Epistome and upper lip forming an arcuate profile as in Schel- 

 lenberg's fig. 16 (1926) of murrayi. Gnathopod 1, 6th joint subequal to upper margin 

 of 5th. Gnathopod 2, 6th joint nearly as long as hind margin of 5th. Telson elongate, 

 tapering. 



T. murrayi, Wlkr. 1907, and T. murrayi, Schell. 1926, both appear to be composite 

 species . The variation mentioned by Walker ( 1 907 , p . i6)shouldbe tested to see whether 

 it is really a case of variation or whether two or more species have not been united. The 

 original description of adarei made no mention of the epistome, and this feature also 



Fig. 15. Tryphosa adarei, Wlkr. a. Pleon segments 3 and 4. 

 b. Profile of epistome and upper lip. 



requires examination in the type material. Here, as in the Terra Nova Report, I regard 

 murrayi as a perfectly distinct species. Chilton's (1912) and Schellenberg's (1926) 

 records therefore do not apply ; and in the Terra Nova Report the reference to Schellen- 

 berg and the Gauss locality should be deleted. 



It is curious that this species was only taken once by the ' Discovery.' 



Distribution. Ross Sea. 



Tryphosa triangularis, n.sp. (Fig. 16). 



Occurrence: 1. St. 140. South Georgia. 1 c?, 1 immat. $ 9 mm. 



2. St. 141. South Georgia. 1 c? 9 mm., 1 $ 10 mm., 4 ovig. $$ 9-12 mm. 



3. St. 144. South Georgia. 2 ovig. $$ 11 mm., 1 immat. 7-5 mm. 



4. St. 145. South Georgia. 7 $$ 9-1 1 mm., 4 ovig. 9$ 10-12 mm. 



5. St. 159. South Georgia. 11 $$, with ova and embryos, 10-n mm. Types. 



6. St. WS 25. South Georgia. 3 $$ 9-10 mm., 1 juv. 5 mm. 



Description. The distinctive features of this species are : antero-lateral angle of head 

 acute, reaching three-quarters the length of 1st joint of antenna 1 ; eyes invisible; pleon 



7-2 



