CEUSTACEA OP THE MEEGUI ARCHIPELAGO. 269 



ocular portion of tlie rostrum is more or less prolonged back- 

 wards, the crest becoming gradually less visible in one specimen 

 to the middle of the cepbalotliorax, but in the otber two not so 

 far. The upper surface of the cephalothorax is rounded and 

 minutely punctate. 



The postabdomen, and more especially its terminal segment, 

 closely resembles that of A. Edwardsii, the terminal segment 

 being armed on its upper surface with two pairs of minute 

 spines ; whereas in Audouin's species this upper surface is 

 glabrous, it is more or less hairy in this species. 



The two pairs of antennae o^ A. Sippotlwe are closely similar 

 to those of A. JEdioardsii, and differ from those of A. parvirosfris, 

 Dana, in the complete absence of an external spine on the basal 

 joint of the outer antennae. . The second joint of the peduncle of 

 the inner antennae is about once and a half as long as the first, and 

 the third is a little shorter than it ; the peduncle is a little hairy. 

 The peduncle of the outer antennae is as long as, or scarcely longer 

 than, that of the inner antennae, and the basal scale, which is nar- 

 rowed considerably towards the apex, and whose external more 

 solid part terminates anteriorly in a spine, comparatively a little 

 longer than in A. Edwardsii, is as long as the peduncle. The 

 outer maxillipeds resemble those of A. Edwardsii, but they are a 

 little longer, and project with a larger or smaller portion of the 

 terminal joint beyond the antennal peduncles. 



In their outer appearance, the legs present a striking resem- 

 blance to those of A. parvirostris, Dana, the legs of A. Edivardsii 

 being more slender. The arms of the anterior legs are equal 

 and unarmed at the distal ends of their upper margins ; in 

 A. Edwardsii the internal margin of the under surface is armed 

 at the distal end with a small spine ; but in this species a proper 

 spine does not occur there, although the distal end termi- 

 nates in a sharp point. The carpopodites are quite similar to 

 those of A. JEdwardsii. As regards its shape and structure, 

 the larger hand of A. Jlijp-pothoe, is intermediate between that of 

 A. Edwardsii and that of A. parvirostris ; for whereas the hand 

 is less slender than in Audouin's species, the proportion of its 

 length (the fingers included) to its breadth being exactly the same 

 in this species and in A. parvirostris, the distal half of the hand 

 in this species is more contracted and narrower than in A. par- 

 virostris, resembling in this character A. Edtoardsii. The hand 

 is rounded at its proximal end, and notched on its upper as 



