198 Annals of the South African Museum. 



In 1906 Stebbiug doubtfully included this species with Dana's 

 brasiliensis. Bate's figures of his own species are very different from 

 those which he gives of Dana's species (presumably copied from 

 Dana's work) as regards the two features which distinguish the 

 species, namely : the 2nd guathopod of the male and the 2nd joint of 

 the 4th peraeopod. Dana makes no mention of a tooth on the palm 

 of the former and figures the 2nd joint of the 4th paraeopod as 

 uniformly oval. Chevreux (1910, Mem. Soc. Zool. Fr. vol. 23, p. 222, 

 text-fig. 22 and pi. 15, figs. 14-20) follows Dana in the first point 

 and in the second figures the joint in question rather narrower than 

 Dana, but nevertheless not at all similar to that of pectenicrus. 



These two characters leave no doubt that pectenicrus should be 

 retained as a species distinct from brasiliensis. 



As regards Walker's serrula, young specimens from the same 

 gathering as the adults are in perfect agreement with his description 

 and figures ; the " flat-topped teeth of peculiar f orm " becoming at the 

 last (probably) moult longer, more numerous and closely set, and the 

 hind margin becoming distally concave. 



The following description, applying to the South African specimens, 

 will supplement that of Bate. 



Body smooth. Eyes fairly large, oval. Postero-inferior angle of 

 3rd pleon segment quadrate, with a very minute point, herein differing 

 from Bate's figure. Telsou as figured by Walker for serrula. 



First antenna reaching to 4th peraeon segment, 1st and 2nd joints 

 subequal, 3rd a little shorter, flagellum not quite as long as peduncle, 

 ca. 20-joiuted, accessory flagellum 3-jointed. 



Second antenna reaching base of flagellum of 1st antenna, 4th and 

 5th joints subequal, flagellum longer than 5th joint, ca. 10-jointed. 



Mouth-parts without particular features. 



First guathopod, as in E. rapax Costa, anterior margins of 5th and 

 6th joints with several transverse rows of setae in . 



Second gnathopod in (Jas figured for serrula; in $ and young $ 

 the 6th joint is elongate-oval, the palm as long as the hind margin 

 and defined by a spine (but no tooth or projection), the palm bears a 

 few spinules and the setae are simple and less numerous, inner margin 

 of finger serrate. 



Third peraeopod, 2nd joint narrowing slightly distally, hind margin 

 nearly straight, obscurely serrate. 



Fourth peraeopod, 2nd joint strongly narrowed and concave distally, 

 postero-inferior angle rounded, lower part of hind margin with 

 numerous, closely-set, spiniform teeth in the adult $ . in young $ as 

 figured for serrula; in ? the 2nd joint narrows distally as in the 



