HANSEN: THE ISOPODA. 97 



the mouth organs are foirnd in species which in general shape and other struc- 

 tural features seem to be rather closely allied. Unfortunately, the mouth parts 

 in several of the species described by Beddard in the " Challenger " Isopoda 

 are entirely unlaio\vn. 



1. Eurycope pulchra, n. sp. 



Plate I. Fig. 1-li. 



One much mutilated male and six females, three of them with the mar- 

 supium well developed, the others much more than half grown or almost fully 

 grown, were captured. 



Head. The dorsal surface with three acute processes, the two anterior of 

 which are rather small, each lying a little behind the antennula, while the 

 third odd process is rather good-sized and separated from the two others by a 

 deep and rather broad furrow. On each side this furrow runs down the lateral 

 surface of the head, above it bends obliquely forward, converging with the 

 furrow from the other side, and finally terminating in a median impression 

 between the two anterior processes. The labrum is very large and prominent, 

 anteriorly rounded. 



Antennula. The basal joint of the peduncle is oblong, anteriorly cut off ; 

 the most distal part of the interior side, where the second joint is articulated, 

 is incised ; the upper side is irregularly arched, the distal part of the under 

 side longitudinally somewhat excavated. The second joint is as usual short, 

 the next slender and of about the same breadth at both ends ; the anterior 

 inner angle somewhat produced, acute. Third joint somewhat shorter and much 

 more slender than the second. The flagellum somewhat exceeding one third 

 of the length of the body, with innumerable joints. 



Antennas. In no specimen are more than the four proximal short joints and 

 sometimes the basal part of the very elongated fifth joint preserved. Third 

 joint anteriorly on the limit between the exterior and the lower side produced 

 into a very conspicuous acute process ; the exopod (squama) very small and 

 quite fused with the third joint, not even set off by a transverse suture (com- 

 pare the following species). 



Mandibles (Fig. \h and 1 c). Of about the same shape as in Janira and 

 allied genera. The cutting portion (a) compressed, much higher (when seen 

 from in front) than broad, ending with three teeth. Pars molaris (6) moder- 

 ately long, somewhat compressed, so that it is broader when seen from in front 

 than when seen from below as in the figure ; distally it is cut off obliquely, 

 with some setae, and as usual the terminal face of the two molar processes is 

 somewhat differently shaped. Lacinia mobilis (/) ^vith numerous setae, and 

 the cuspis lacinia on the left mandible strongly developetl, compressed and 

 much higher than broad, ending in four teeth. The palpus stout, three-jointed, 

 second joint almost double as long as the first ; third joint of a peculiar aspect, 

 curved, rather broad, with a conspicuous incision on the anterior margin. 



