Chilton. — Ampliipodan Genera Bircenna, Kuria, and Waodelia. 63 



1. Kuria longimana, Walker and Scott. 



Kuria longimanus, Walker and Scott in Nat. Hist. Sokotra, p. 228, pi. xivh, 

 figs. 5-5n (1903). K. longimana, Stebbing in " Das Tierreich Amphi- 

 poda," p. 726 (1906). 



Body rather plump, first 4 side-plates deeper than their segments ; last 

 3 segments of pleon coalesced. Gnathopods very slender, 2nd joint as 

 long as the next 3, 5th as wide and almost as long as the 6th, which is about 

 5 times as long as broad ; palm very small, oblique, defined by a spine, 

 finger projecting beyond palm by about one-fourth of its length. Uropods 

 1 and 2 with peduncles rather shorter than the rami, which are equal and 

 similar, and bear a few spines ; 3rd uropod with peduncle short and broad, 

 the single ramus about as long as peduncle, but more slender, and with 

 one or two spines at apex. Telson divided to base, the two subtriangular 

 divisions turned up on edge, the lower margin being convex and the upper 

 straight, with 2 or 3 setse near the distal end. Length, 2 mm. 



Abd-el-Kuri. 



Remarks. 



In addition to the points that have been mentioned in the descriptions 

 given above, there are several others that I have not included, because I 

 have not yet been able to make a satisfactory comparison of them in the 

 different forms. For example, Messrs. Walker and Scott describe the last 

 3 segments of the pleon as being fused together in Kuria longimana ; and 

 Chevreux says that the last 2 segments are fused together in Bircenna 

 crassipes. They appear to be fused also in B. fulva, but owing to the 

 imperfect development of the 6th segment it is difficult to be quite clear 

 as to the actual state of affairs. 



In Bircenna crassipes, as figured and described by Chevreux, there is no 

 molar process on the mandible, while in Kuria longimana Messrs. Walker and 

 .Scott describe the molar process as " rather large." In Bircenna fulva the 

 mouth parts, so far as I have been able to examine them in the single very 

 small specimen at my disposal, appear to closely resemble those of B. cras- 

 sipes. The mandible shows no molar process or palp, the cutting-end is 

 formed of some 4 or 5 indistinctly marked teeth, and the accessory process 

 is either absent altogether or very imperfectly developed. The 2 pairs of 

 maxillte have practically the same form as in B. crassipes, and the maxilU- 

 pede also closely resembles that of the same species. The upper Up is 

 small, and regularly rounded at the end, which bears a few very short 

 setae ; in the lower lip the lateral lobes are rounded and finely ciliated on 

 the distal border. 



The 3rd pleopods are shown in fig. 1. They have the inner margin 

 of the peduncle much produced, and bear 2 very short coupling-spines at 

 its distal end ; the inner branch has a projection of its outer margin near 

 the base, as shown in tlie figure. The other pleopods closely resemble 

 the 3rd pair. 



