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DISCOVERY REPORTS 



Oradarea tricarinata, n.sp. (Figs. 96 a, 99). 



Occurrence: 1. St. 144. South Georgia. 1 ovig. $ 11 mm. 



2. St. 172. South Shetlands. 2 ?$ (1 ovig.) 17 mm. 



3. St. 175. South Shetlands. 1 c? 12 mm., 6 ,? 13-15 mm. Types. 



Description. Integument with major sculpturing as in tridentata, but the interspaces 

 between the elongate pits or ridges filled with exceedingly minute and regular pitting. 

 Post-antennal angle of head acutely produced. Eyes subcircular, rather large, pale. 

 Peraeon segment 7 with a strong dorsal tooth. Picon segments 1-3 strongly carinate, 

 the carina ending in a sharp tooth on segments 1 and 2, rounded at each end on seg- 

 ment 3. A lateral keel on peraeon segments 6 and 7 and pleon segments 1 and 2, ending 

 in a sharp tooth, smallest on peraeon segment 6. Postero-inferior angle of pleon segment 1 

 rounded, of 2 ending in a short point, of segment 3 broadly rounded with a small 

 notch on the lower margin. Side-plate 1 widening below. All side-plates with lower 



b a 



Fig. 99. Oradarea tricarinata, n.sp. a. Peraeon segments 6 and 7 

 and pleon segments 1-3. b. Telson. 



margin serrulate. Telson subquadrangular, broad, apex truncate, with some minute 

 irregular crenulations. 



Epistome and upper lip gibbous and subcarinate. Antenna 1 with 1 -jointed accessory 

 flagellum. 



Gnathopods 1 and 2, 6th joint as in tridentata. Peraeopods 3-5, 2nd joint with hind 

 margin feebly serrulate. 



The single specimen from St. 144 has a dorsal tooth and a lateral tooth on each side 

 on peraeon segment 6 as well as on segment 7, but is otherwise exactly similar to those 

 from St. 175. Both specimens from St. 172 show a short obtuse dorsal point on peraeon 

 segment 6 and the lateral teeth are not so well developed as in the other specimens. 



Oradarea impressicauda, n.sp. (Figs. 96 c, 100). 



Occurrence: St. 170. South Shetlands. 1 y 15 mm. 



Inscription. Integument sculptured as in tridentata, rather strongly so, the pits 

 tending to form transverse lines on the pleon, the pitting extending on to 2nd joints of 

 peraeopods 35. Post-antennal angle of head acutely produced. Eyes subcircular, rather 



