Crustacean Fauna of South Africa. 125 



Geogr. Distribution : Mediterranean, Hyeres, Corsica, coast of Tunis, 

 6-170 metres. 



GEN. HIPPOMEDON Boeck. 



1871. Hippomedon Boeck, Forh. Selsk. Christian. 1870, p. 102. 

 1906. Stebbing, Das Tierreich 21, pp. 58, 719. 



HIPPOMEDON LONGIMANUS (Stebbiug). 



1888. Plutamon longimanus Stebbing, Challeng. Eep. vol. 29, p. 643, 



pi. 13. 



1906. Hippomedon ,, id. I.e. p. 60. 



1910. id. Gen. Cat. S.A. Crust, p. 449. 



Stebbing has recorded a specimen from off the Cape Peninsula with- 

 out further remark than that the eyes were nonappareut. A smaller 

 and presumably young specimen of the same species from off Cape 

 Point shows the following peculiarities : 



The dorsal keel on the 4th pleon segment does not end acutely, the 

 1st joint of the 1st antenna is not produced, second antenna not very 

 much longer than first, flagellum 15-jointed, inner plate of 1st maxilla 

 with 4 setae (as in H. geelongi Stebbing), but inner margin not setose, 

 palp not hirsute, with 12 short apical spine-teeth, inner plate of 2nd 

 maxilla not setose along inner margin and not basally widened, maxil- 

 liped with inner plates not remarkably broad and 3rd joint of palp 

 broadly oval, palm of 2nd giiathopod not concave, apex of telson more 

 rounded. 



The first, second and last of these characters are found also in 

 Stebbing's Cape specimen, the mouth parts of which, however, I have 

 not dissected. 



Three other specimens from the Natal coast, also apparently immature, 

 are more typical in having the 2nd antenna much longer than the 1st, 

 inner plate of 1st maxilla with 2 setae and the telsonic apices fairly 

 narrow. On the other hand, they resemble the Cape Point specimen 

 in having no acute keel on 4th pleon segment, palm of 2nd gnathopod 

 not concave, inner plate of 2nd maxilla and inner plate of maxilliped 

 not broad, and 3rd joint of palp of maxilliped broadly oval. The 

 postero-iuferior angles of 3rd pleou segment are quite short, shorter 

 even than in the Challenger specimen, whereas in the other two Cape 

 specimens the process is longer than in the Challenger specimen. 



Length: 9 mm. (Cape), 8 mm. (Natal). 



Colour : In spirit, yellowish white. 



