Crustacean Fauna of South Africa. 125 
Geogr. Distribution: Mediterranean, Hyéres, Corsica, coast of Tunis, 
6-170 metres. 
Gren. HIPPOMEDON Boeck. 
1871. Hippomedon Boeck, Forh. Selsk. Christian. 1870, p. 102. 
1906. pa Stebbing, Das Tierreich 21, pp. 58, 719. 
HIPPOMEDON LONGIMANUS (Stebbing). 
1888. Plutamon longimanus Stebbing, Challeng. Rep. vol. 29, p. 643, 
pl. 1s. 
1906. Hippomedon _ ,, Gls Me, joe, (60). 
1910. Fs os 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 nonapparent. 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 
Ist joint of the Ist antenna is not produced, second antenna not very 
much longer than first, flagellum 15-jointed, inner plate of Ist 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 38rd joint of palp 
broadly oval, palm of 2nd gnathopod 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 Ist, 
inner plate of Ist 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-inferior angles of 38rd pleon 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. 
