198 Annals of the South African Museum. 
In 1906 Stebbing 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 gnathopod 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, Mém. Soe. Zool. Fr. vol. 23, p. 222, 
text-fig. 22 and pl. 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 pecuhar form ” 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. Telson as figured by Walker for serrula. 
First antenna reaching to 4th peraeon segment, Ist and 2nd joints 
subequal, 3rd a little shorter, flagellum not quite as long as peduncle, 
ca. 20-jointed, accessory flagellum 5-jointed. 
Second antenna reaching base of flagelluin of Ist antenna, 4th and 
5th joints subequal, flagellum longer than 5th joint, ca. 10-jointed. 
Mouth-parts without particular features. 
First gnathopod, as in FE. rapaw Costa, anterior margins of 5th and 
6th joints with several transverse rows of setae in ¢. 
Second gnathopod in das figured for serrula; in 2 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 gin young ¢ as 
figured for serrula; in @ the 2nd joint narrows distally as in the 
