LYSIANASSIDAE 



49 



junction. Mandible with palp inserted over the strong molar. Maxilliped with 

 inner margin of outer plate serrulate, a few large squarish spines on the apical 

 margin. 



Gnathopod i, 5th joint short, triangular, 6th oblong, parallel-sided, palm transverse, 

 slightly convex, two strong spines at the angle, and a row of setae along palm, finger 

 with a small tooth distally on inner margin. Gnathopod 2, 6th joint a little more than 

 half length (along upper margin) of 5th, ovate, obscurely chelate. 



Peraeopods 1-5 stouter than in barbatipes, especially peraeopods 3-5, the 4th joints 

 strongly expanded. 



Uropod 3, rami lanceolate, subequal, inner distal margins setose. 



A single accessory branchia on both segments 5 and 6. 



Fig. 12. Tryphosella atbina, n.sp. a. Peraeopod 5. b. Side-plate 1. c. Profile 

 of epistome and upper lip. d. Pleon segments 3 and 4. e. Gnathopod 1. 



Remarks. This form seems to be allied to barbatipes, Stebb., from Kerguelen, but 

 differs in the stronger hand of gnathopod 1, with its short 5th joint, and the stouter 

 posterior peraeopods. 



Genus Tryphosa, Boeck. 



Stebbing, 1906, pp. 68, 720. 

 Stephensen, 1925, p. 101. 

 Schellenberg, 1926, p. 266. 



Tryphosa kergueleni (Miers) (Fig. 13). 



Stebbing, 1888, p. 623, pi. viii; 1906, p. 69. 

 Shoemaker, 19 14, p. 74. 



Schellenberg, 1926, p. 266, fig. 15 a; 1931, p. 34 (part). 

 Barnard, 1930, p. 327. 



Typical form 



Occurrence: 1. St. 165. South Orkneys. 1^,1 ovig. $ 14-15 mm. Stomach of Notothenia. 

 2. St. 174. South Shetlands. 1 ovig. $ 14 mm. 



