Crustacean Fini<i <>f Xmtfh 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. 



GEN. EURYSTHEUS Bate. 



1856. Eiirystheus Bate, Ann. Mag. Nat, Hist. ser. '2, vol. 19, p. 143. 

 1906. Stebbing, Das Tierreich, 21, pp. 610, 738 (refer- 



ences). 



1910. id. Sci. Ees. " Thetis," pt. 12, p. 613. 



1910. id. Gen. Cat. S.A. Crust, p. 460. 



1910. 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, 



pi. 113. 



1908. Eurystheus afer id. S.A. Crust, pt. 4, p. 87. 

 (Nou Chiltou, Tr. Roy. Soc. Edinb. vol. 48, pt. 2, 1912, p. 510, pi. 2, 

 figs. 30-34.) 



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 E. 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 

 guathopods, 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 guathopods are alike in both sexes. 



The second gnathopod is of the same general shape as in E. 

 ntlanticus 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 E. atlanticus but has been omitted in Stebbing's 

 figure, 1908, I.e. pi. 40s) ; also the palm is more even, cut into several 

 (3-5) rounded lobes, each with secondary crenulations. Second 

 gnathopod of ? as in Stebbing's figure (1888, I.e. pi. 113) but palm 

 crenulate, not smooth as drawn (the description is correct) 



The Challenger specimen was certainly immature as this species 

 reaches llmm. in length. 



A frequent habitat of this species is in the empty worm tubes 



17 



