Contributions to the Crustacean Fauna of South Africa. 393 



only the submedian teeth are present on the posterior margin of 

 4th pleon segment, the basal and central submedian tubercles on 

 the telson are connected by 2 ridges and the tubercles on the out- 

 side of the central ones are separated from the latter by a well- 

 marked groove, whereas in C. zanzibarensis the outside tubercle and 

 the central one are combined into one bifid tubercle ; the terminal 

 boss is absent in C. comans, a small conical tubercle taking its place; 

 and also the median lobe does not extend beyond the apices of the 

 lateral ones. 



It must be confessed that the correlation of the females with the 

 above male rests only on a general proximity of the localities of 

 capture and a fairly close agreement in the details of the appendages, 

 especially the armature of the peraeopods. 



CYMODOCE FALCATA, n. sp. 

 (Plate XXXIV. A.) 



Closely allied to C. uncinata, Stebbing, 1902, but differing in the 

 following particulars : head, peraeon, pleon, and uropods hirsute, 

 the hairs on the epimera, lateral margins of pleon and a fringe on 

 hind margin of 4th pleon segment being plumose and very long. 

 The submedian tubercles on 4th pleon segment partake more of the 

 character of bosses and are far more prominent than the submedian 

 bosses on the telson, exactly the reverse of what is found in C . unci- 

 nata. Posterior to the bosses on the telson are 2 minute submedian 

 tubercles. The median lobe of the trifid apex ends in a recurved 

 hook, immediately in front of which is a flat button-like knob. The 

 inner ramus of the uropods is similar to that of C. uncinata, but the 

 outer is nearly twice as long as the inner, projecting well beyond 

 telsonic apex, lanceolate with acute apex. 



Flagella of 1st and 2nd antennae respectively 13-16-jointed and 

 14-17-jointed. 



There are no differences in the mouth parts. In C. uncinata the 

 greatest width of the inner plate of the maxilliped is described as 

 being in the upper half. I find on examination that this is not 

 a constant character. 



The 6th joint of the 1st peraeopod has 4 spines on inner margin 

 instead of 6, as in C. uncinata. 



Male appendages on 7th peraeon segment rather more elongate 

 and the male stylet on 2nd pleopod tapers more rapidly to the apex 

 in the distal third. 



Length : 13 mm. ; breadth : 6 mm. 



