PONTOGENEIIDAE 203 



for about one-quarter its length, lobes dehiscent, broad, several setules and one spine 

 along lateral margin. 



Epistome with an acute spiniform process, longer and more prominent than in magel- 

 lanica. Antenna 1 with a minute 1 -jointed accessory flagellum, and a sensory filament 

 on every alternate joint of the flagellum. 



Gnathopods 1 and 2 as in magellanica, but palm in gnathopod 2 more oblique and 

 distinctly concave, with rounded defining angle bearing four spines. 



Remarks. An interesting addition to the genus, and quite distinct from magellanica. 



Genus Djerboa, Chevr. 

 Chevreux, 1906, pp. 74. 

 Schellenberg, 1929 a, p. 279. 



Djerboa furcipes, Chevr. (Fig. 118 a). 



Chevreux, 1906, p. 74, figs. 42-44; 1913, p. 179. fig- 6 °- 

 Chilton, 1912, p. 500. 

 Shoemaker, 1914, p. 75- 

 Schellenberg, 1926, p. 363. 



Occurrence: 1. St. 141. South Georgia. 6 ovig. ?$ 16-18 mm. 



2. St. 145. South Georgia. Many <?<?, ?? and juv. 10-21 mm., mostly ovig. $$ 

 17-20 mm. 



3. St. 179. Palmer Archipelago. 2 <$<$ 10 and 12 mm. 



4. St. WS 25. South Georgia. 2?$ 21-22 mm. 



5. St. WS 62. South Georgia. 2 ??, 1 ovig. $, 17-18 mm. 



6. St. MS 10. South Georgia. 1 <J 12 mm., 7 $$ (3 ovig.) 16-20 mm. (mutilated). 



7. St. MS 32. South Georgia. 1 $ 13 mm., 3 $? 15-16 mm., 6 ovig. ?? i6-i8mm. 



8. St. MS 65. South Georgia. 5 <?<? 10-11 mm., 6 $$ 9-17 mm., 1 ovig. $ 17 mm. 



9. St. MS 67. South Georgia. A lot £& ?? and juv. 3-18 mm., inch ovig. ??. 



10. St. MS 71. South Georgia. Fifteen specimens 6-5-12 mm. 



11. St. MS 74. South Georgia. Forty-three specimens 8-13 mm. 



Remarks. Chilton has noted the impressions in the integument. They are more or 

 less horizontal on the anterior part of the body, becoming oblique and then transverse 

 posteriorly. So far from helping to distinguish Djerboa from Oradarea, they accentuate 

 the likeness between these two genera. 



The eye of the 6* is not reniform, but similar to that of the $. The S<$ from St. MS 65 

 have long coiled masses of spermatozoa issuing from the penes (cf. Chosroes, Barnard, 



193°. P- 37°- %• 3 8 b )- 

 Distribution. Graham Land, 3-5 m.; South Orkneys, 10-15 m.; South Georgia; 



Kerguelen. 



Genus Schraderia, Pfr. 



Pfeffer, 1888, p. 141 and pi. ii, fig. 5. 



Stebbing, 1888, p. 913 (Atyloides); 1906, p. 362 {Atyloides). 

 Schellenberg, 1929 a, p. 280 {Atyloides). 

 Remarks. Firstly, Chilton has examined specimens labelled " Schraderia gracilis" 

 (191 2, p. 497) which he said were referrable to A. serraticauda, Stebb. Though Chilton 



26-2 



