CALLIOPIIDAE 



165 



6th joint obviously longer than 5th, palm slightly oblique and concave, defining angle 

 with three spines. 



Peraeopods 3-5, 2nd joint with hind margin distinctly serrate. 



Uropod 3, peduncle and rami as described above for novae-zealandia. 



Remarks. The tooth of peraeon segment 7 is often absent in juvenile examples. The 

 notching on the telson is variable, but the general shape of the telson is constant and 

 easily distinguished from that of the other species. 



It is probable that some at least of Chevreux's specimens were the same as these. He 

 records that the specimens before him had either three, or two, or no dorsal teeth; 

 but the postero-inferior angle of pleon segment 3 does not seem to have been examined. 



I must confess that in studying the Terra Nova collection the current opinion as to a 

 "widely distributed" species probably allayed the critical faculties. A re-examination 

 of the two specimens from the Antarctic recorded in that report would, I expect, prove 

 them to be distinct from the New Zealand species, and either this or the next species. 



Oradarea bidentata, n.sp. (Figs. 96 b, 98). 



? Walker, 1903, p. 56, pi. x, figs. 77-89 (O. longimana). 



? Barnard, 1930, p. 369 (part, Leptamphopiis novae-zealandiae, rum Thorns.). 



Occurrence: 1. St. MS 67. South Georgia. 4^8-iomm., 2 $$ 10-11 mm., 3 ovig. $$9-10 mm. 

 Types. 



2. St. MS 71. South Georgia. 9 $$ 6-8 mm. 



3. St. MS 74. South Georgia. 7 SS 9-10 mm., 1 $ 11 mm., 1 ovig. $ 9 mm. 



Description. Integument as in tridentata. Only pleon segments 1 and 2 with dorsal 

 teeth, which are acute when viewed dorsally. 



Post-antennal angle of head rounded-quad- 

 rate. Eyes subcircular, rather large, pale. Pos- 

 tero-inferior angle of pleon segment 2 with 

 a short point, of segment 3 broadly rounded, 

 with a small notch on posterior margin. Side- 

 plate 1 slightly widened below. All side-plates 

 obscurely serrulate. Telson oblong but taper- 

 ing distally to the bluntly rounded apex. 



Epistome and upper lip gibbous, sub- 

 carinate. Antenna 1 with 1 -jointed accessory 

 flagellum. 



Gnathopod 1, 6th joint subequal to 5th, somewhat tapering distally, palm oblique, 

 not concave. Gnathopod 2, 6th joint slightly longer than 5th, palm slightly convex. 



Peraeopods 3-5, 2nd joint with hind margin obscurely serrulate. 



Remarks. I do not really think these specimens are the same as Walker's; his figure 

 of the postero-inferior angle of pleon segment 3 does not fit any of the specimens in the 

 Discovery collection, though perhaps it is nearest to that of impressicauda (infra). The 

 Southern Cross material should be re-examined. 



a. 6. 



Fig. 98. Oradarea bidentata, n.sp. a. Pleon 

 segments 2 and 3. b. Telson. 



