Crustacean Fauna of South Africa. 249 
had been struck, it is unfortunately impossible to give a figure of this 
species, but I hope to do so on a future occasion. 
Gren. EURYSTHEUS Bate. 
1856. Hurystheus Bate, Ann. Mag. Nat. Hist. ser. 2, vol. 19, p. 143. 
1906. a Stebbing, Das Tierreich, 21, pp. 610, 738 (refer- 
ences). 
1910. #. id. Sci. Res. “‘ Thetis,” pt. 12, p. 6138. 
1910. a id. Gen. Cat. S.A. Crust. p. 460. 
1910. n Kunkel, Tr. Conn. Ac. Sci. vol. 16, p. 81. 
EURYSTHEUS AFER (Stebbing). 
(Plate XXVIII. Fig. 11.) 
1888. Gammaropsis afra Stebbing, Challenger Rep. vol. 29, p. 1097, 
pl. 11s. 
1908. Eurystheus afer id. S.A. Crust. pt. 4, p. 87. 
(Non Chilton, Tr. Roy. Soc. Edinb. vol. 48, pt. 2, 1912, p. 510, pl. 2, 
figs. 830-34.) 
As no figure of the 2nd gnathopod of the ¢ has been published it 
seems advisable to give one here, especially since Stebbing (1908) has 
made the suggestion that H. atlanticus and E. afer are varieties of the 
same species; this suggestion has been more or less endorsed by 
Chilton (1912). 
From the figure it will be seen that the difference between the 2nd 
gnathopods, though not great, is as well marked as that between the 
eyes of the two species, and these two characters together seem quite 
enough to keep the species separate. 
The first gnathopods are alike in both sexes. 
The second gnathopod is of the same general shape as in LE. 
atlanticus but the palm has a very much shallower excavation near the 
lower angle, where there are two teeth and a stout spine (this spine 
is present also in EH. atlanticus but has been omitted in Stebbing’s 
figure, 1908, l.c. pl. 408) ; also the palm is more even, cut into several 
(3-5) rounded lobes, each with secondary crenulations. Second 
gnathopod of 2 as in Stebbing’s figure (1888, l.c. pl. 113) but palm 
crenulate, not smooth as drawn (the description is correct) 
The Challenger specimen was certainly immature as this species 
reaches 11mm. in length. 
A frequent habitat of this species is in the empty worm tubes 
17 
