﻿South African Crustacea. 81 



strongly dilated above the fifth, and the transversely apposed 

 seventh is strongly spined. The third maxillipeds have the ante- 

 penultimate joint long and twisted, the penultimate distally expanded 

 beyond the insertion of the last joint ; this inward expansion carries 

 a group of straight setae extending beyond the last joint, which is 

 more than twice the length of the penultimate and itself very 

 copiously furnished with long setae. 



The first peraeopod, which from its structure is no doubt the 

 smaller cheliped of the present species, is remarkable alike for its 

 setose furniture and the great length of the hand. The character 

 naturally suggested a comparison with Alpheus longhnamis, Bate 

 (Eep. Voy. Challenger, p. 551, pi. 98, fig. 4), a species which I 

 cannot find mentioned in Dr. de Man's admirable monograph of the 

 family, nor indeed by any other authority since its publication. 

 Bate declares that the second peraeopods have the " carpos six- 

 articulate," which would be a very important feature, were not the 

 importance discounted by the circumstance that his figure clearly 

 shows the wrist normally five-jointed. In the first antennae he 

 represents the shorter flagellum as much less than half the length 

 of the other, and in the second antennae the long joint of the 

 peduncle overtops the scale, whereas in our specimen it does not 

 reach the top of it. In the smaller first peraeopod Bate describes 

 the fingers as "nearly, and in some instances quite, as long as the 

 propodos," meaning of course the palm. In our species the fingers 

 are very considerably shorter than the palm, and the fringes of very 

 long setae with which fingers and palm are alike begirt are 

 exceedingly notable. The fourth joint on the outer edge is as long 

 as the palm, and on the inner edge near the base shows four slender 

 spines and is lightly fringed with setae. The third and rather 

 shorter fourth peraeopods have each the sixth joint fringed with 

 long setae ; the more slender fifth has the distal half of the sixth 

 joint's inner margin fringed with more than twenty little groups 

 of setae, increasing in size as they approach the straight pointed 

 finger. 



The first pleopods have the inner ramus very short, both rami 

 fringed with long setae. In the second pair the inner ramus is 

 longer than the outer, with a long slender retinaculum. In both 

 pairs the peduncle is elongate, with stout setae above and below on 

 the mner margin for holding the ova. The uropods are very broad 

 and strongly plumose, the outer ramus rather the longer, a diaeresis 

 ending in a small tooth low down. The telson is peculiar in shape, 

 narrowing a little above the middle, at five-sixths of the length each 



