86 Annals of the South African Museum. 



The pleopods are furnished with coupling hooks and cleft spines. 

 The rami are slender, about ten-jointed. 



The uropods in each pair have the rami nearly equal to one 

 another and to the peduncle, the first pair being the longest, and the 

 third much the shortest. The telson is broader than long, shorter 

 than the peduncle of the third uropods, its sides very convex above, 

 the distal margin truncate on the ventral surface, dorsally having a 

 rounded emargination and spines on each blunt apex. 



Length, from head to fourth pleon segment, 5 mm. 



Locality. Dredged between Bird Island and mainland, in 10-16 

 fathoms. 



The quadridentate palm of the second gnathopods and the peculiar 

 hind margin in the last three peraeopods are very distinctive marks 

 of this species. The superior length of the fourth pergeopods is 

 rather unusual. 



The specific name is chosen in compliment to Dr. S. J. Holmes, 

 Ph.D., in recognition of his careful and beautifully illustrated work 

 on The Amphipoda of Southern Neio England and other valuable 

 labours in this branch of research. 



EURYSTHEUS ATLANTICUS (Stebbing). 



Plate XL.B. 



1888. Gammaropsis atlantica, Stebbing, Challenger Amphipoda, 



Reports, vol. xxix., p. 1101, pi. 114. 

 1893. Protomedeia ? atlantica, Delia Valle, Fauna und Flora des 



Golfes von Neapel, vol. xx., p. 441. 

 1906. Eurystheus atlanticits, Stebbing, Das Tierreich, Amphipoda, 



p. 611. 



The single specimen from which this species was originally de- 

 scribed was a female. The sexes agree in most particulars, especially 

 in the peculiar lageniform eyes adjoining the margin of the head 

 and occupying its much-produced lateral angles. The second 

 gnathopod, however, is a distinguishing feature, being in the male 

 more massive, with a more strongly sculptured palm, in which the 

 defining tooth is separated by a pronounced excavation from the 

 irregularly crenate remainder of the margin. The finger also in 

 the male does not overlap the palmar tooth as in the female, and, 

 being widened at the middle, it has the inner edge not concave. 

 The second joint in the third peraeopods is broadly oval, nearly as 

 broad as long, with the convex hind margin smooth. 



