AN AMPHIPOD FROM THE TRANSVAAL. 95T 



Anterior margin of outer ramus carries six groups of spines, three 

 to each group except the two most distal, which are made up of 

 two spines each ; distally is a group of fairly long setfe : the 

 posterior margin shows five groups of spines, the first two groups 

 of three spines, and the other three of four spines each. At 

 jiinction of peduncle and outer ramus three spines can be dis- 

 tinguished. In the male the outer ramus appears to be hardly as 

 large as in the female. 



Telson (P\. lA. &g. 17) almost square; sides slightly convex: 

 two small plumose setee on each side bear two larger and two 

 smaller spines placed in a posterior position. The structuie 

 excavate behind ; in the male this excavation not quite so deep 

 as in the female. In specimens from Irene one of the terminal 

 spines on each side is much longer than in other specimens. 



Literature referred to. 



1. Chilton, C. — "The Subterranean Crustacea of New Zealand."" 



Trans. Linn. Soc, 2nd ser. Zool. vol. vi. pt. 2, 1894. 



2. Smith, G. W. — "The Fresh- water Crustacea of Tasmania." 



Trans. Linn. Soc, 2nd ser. Zool. vol. xi. pt. 4, 1909. 



3. Stebbing, T. R. R. — Amphipoda Gammaridea in Das Tierreich, 



21 Lief. Berlin, 1906. 



4. Yejdovsky. — Crangonyx subterraneus (non Bate 1859) in SB,. 



Bcihm. Ges., nr. 10, p. 12, t, 1-3. 



EXPLANATION OF PLATES XLIX.-LI. 



The appendages have been drawn with the aid of a camera lucida. 

 All the figures are oi ISiicrangonyx robertsi, 9 . 



Plate XLIX. 



Side view of female, X 11. 



Plate L. 



Fig. 1. Antennule, X 29. 



1 a. Accessoiy flagelhmi, X ca. 160. 



2. Antenna, X 29. 



3. Lower lip, X ca. 45. 



4. Upper lip, X ca. 45. 



5 & 5 rt. Mandibles, X 29. 



6. Maxillula, X 75. 



7. Maxilla, X 75. 



8. Maxilliped, X 40. 



9. Gnathopod I, X 29. 



Plate LT. 



Fig. 10. Gnathopod II, X 29. 



11. Pereiopod I, X 29. 



12. Pereiopod III, X 29. 



13. Pleopod I, X 29. 



14. Uropod I, X 29. 



15. Uropod II, X 29. 



16. Uropod III, X 29. 



17. Telson, X 29. 



