ON CRUSTACEA BROUGHT BY DR WTLLEY FROM THE SOUTH SEAS. 621 



Apanthura, n. g. 



PliMiu with segments distinct. Mouth-organs as in Anthura, except maxillipeds, 

 which have a three-jointed palp, of which the middle joint is much the largest. The 

 last four pairs of peraeopods, as well as the preceding pairs of peraeon appendages, 

 have the fifth joint under-riding the sixth. 



Name compounded of airo, from, and Anthura, a related genus. 



The only genus in the family Anthuridae agreeing with Ajianthura in the structure 

 of the hind peraeopods is Leptanthura, Sars, from which it is completely distinguished 

 by the mouth-organs. Anthelura abyssorum, N. and S., 1886, may agree in regard to 

 the peraeopods with Apanthura, but, if so, it differs from Anthelura elongata, Norman, 

 and its generic position will require to be reconsidered. 



Apanthura sandalensis, n. sp. 

 Plate LXV a. 



Head considerably longer than broad, with a very small projection in the middle 

 of the front. Seventh segment of peraeon as usual the shortest, not quite so long as 

 the six following segments of the pleon combined, and these rather shorter than the 

 oval telson. The body is slightly pubescent, and the fifth pleon segment fianked with 

 plumose setae. 



Eyes small, dark in spirit, near to the front angles of the head. 



Upper antennae shorter than the lower, third joint shorter than first, longer than 

 second, about as long as the three-jointed flagellum, in which the first and third joints 

 are extremely short. 



Lower antennae with the peduncle so commonly occurring in this family, a short 

 first joint followed by a large somewhat folded second, to which succeed three smaller 

 joints ; the fifth is here longer than the third or fourth and than the setose three- 

 jointed flagellum. 



Upper lip triangular, broader than long, uns^^mmetrically cleft at the apex. 



Mandibles with tridentate apex, but the teeth faintly distinguished ; the pi-ojecting 

 border between the apex and the feeble molar process is very slightly serrulate ; palp 

 three-jointed, third joint scarcely so long as first, carrying four or five spines, the 

 terminal the longest ; second joint with a long spine at apex and a shorter one 

 below. 



Lower lip. The lobes less rounded than in Cyathura and less truncate laterally 

 than in Anthura, with minvite setules at the apical points and three setae on the 

 outer margin at the point where it passes from convex to concave. 



First maxillae as in Cyathura, the apex bent, its point projecting beyond a row 

 of closely set spine-like teeth. 



Second maxillae closely adpressed to the lower lip, but narrower and shorter, the 

 outer margin sinuous, the apices apparently bifid, the stems seemingly coalesced. 



82—2 



