164 DISCOVERY REPORTS 



7. St. MS 6. South Georgia. 1? 11-5 mm. 



8. St. MS 68. South Georgia. Many, incl. ovig. ?$ from roots of giant sponge. 



9. St. MS 74. South Georgia. 4 S3 6-8 mm., 2 juv. 4-5 mm. 



Description. Integument with elongate or scale-like pits, arranged horizontally 

 in front part of body, gradually becoming oblique and then transverse on the pleon 

 segments ; still finer scale-like markings between the major pits. 



Eyes subcircular, rather large, reddish (as preserved). Post-antennal angle of head 

 acutely produced. Side-plate 1 widening below; all the side-plates serrulate on lower 

 margins. Peraeon segment 7 and pleon segments 1 and 2 each with a dorsal tooth, 



Fig. 97. Oradarea tridentata, n.sp. a. Side-plate 1 with sculpture, b. Side-plate 2. c. Telson with margin 

 further enlarged, d. Telson of feebly notched variety, e. Pleon segments 2 and 3. /. Dorsal view of tooth on 

 pleon segment 1. g. Gnathopod 1. h. Gnathopod 2. 



which is acute when seen in dorsal view. Pleon segment 3 with a raised carina, rounded 

 in profile. Postero-inferior angle of pleon segment 1 with a short acute point, of seg- 

 ment 2 with a strong, slightly curved point, of segment 3 with an upturned acute point 

 some little distance above the lower margin, with a deep semicircular notch above it. 

 Telson subtriangular, the lateral margins narrowing rather abruptly at about two-thirds 

 the length, the apical margin entire or feebly notched, each notch with a setule. 



Epistome and upper lip gibbous, subcarinate medially. 



Antenna 1 with a minute 1 -jointed accessory flagellum. 



Gnathopod 1, 6th joint broader than in novoe-zealandiae, slightly though distinctly 

 longer than 5th, not narrowing distally, palm slightly oblique, concave, defined by a 

 blunt angle and about six spines (four on one side, two on the other). Gnathopod 2, 



