20o DISCOVERY REPORTS 



Gnathopods i and 2 as in antarctica, Chevr. Peraeopods 3-5, 2nd joint in peraeopods 

 3 and 4 oval, in peraeopod 5 oblong, the hind margin straight or even inclined to be 

 very slightly concave, lower hind angle rounded. 



Remarks. This, the first example of the genus to be recorded from this island, 

 appears to be a good species characterized by the 4th side-plate, 3rd pleon segment, 

 post-antennal angle of head, and eye, in combination with the flagellum of antenna 1. 



a. b. c d 



Fig. 120. Pontogeneia tristanensis, n.sp. a. Pleon segment 3. 

 b. Telson. c. Head. d. Side-plate 4. 



Genus Pontogeneiella, Schell. 

 Schellenberg, 1929 a, p. 278. 

 In explanation of the terms " schuppen-formig " (key, p. 276) and "flache lamella" 

 (p. 278) used by Schellenberg in describing the rudimentary accessory flagellum, it may 

 be stated that they refer merely to the distal margin of the 3rd peduncular joint. There 

 is no articulated accessory flagellum or rudiment thereof. 



Pontogeneiella brevicornis (Chevr.) (Fig. 118/). 



Chevreux, 1906, p. 79, figs. 45-47; 191 1, p. 403. 

 Chilton, 1925, p. 178. 

 Schellenberg, 1929 a, p. 278. 



Occurrence: 1. St. 165. South Orkneys. 1 $ 22 mm. (antennae lost) from stomach of Notothenia. 



2. St. 173. South Shetlands. 5 $<$ 12-13 mm., 11 ?? 12-15 mm. 



3. St. WS 56. South Georgia. 3 immat. $? 18 mm. 



Remarks. Integument minutely shagreened, with scattered pits. 

 Distribution. Palmer Archipelago; South Orkneys; South Sandwich Islands. 



Pontogeneiella longicornis (Chevr.) (Fig. 118/). 

 Chevreux, 1906, p. 84, figs. 48-50; 1913, p. 179. 

 Schellenberg, 1929 a, p. 278; 1931, p. 190. 



Occurrence: 1. St. 190. Palmer Archipelago (315 m.). 1 immat. $ 26 mm. 



2. St. WS 25. South Georgia. 1 $ 18 mm. 



3. St. MS 10. South Georgia. 3 $$ 15-21 mm. 



4. St. MS 67. South Georgia. 1 $ 15 mm. 



Remarks. Integument as in brevicornis. There would seem to be considerable likeli- 

 hood of this species being merged in brevicornis. The serration of the hind margin of 



