iklMACKA MAUACOSTRACA. III. fyj 



subcylindrical process terminating in a small spine and directed downwards ami considerably forwards; 

 sixth joint of the peduncle is somewhat longer than the fifth; the flagellum in the largest specimen 

 even a little longer than the sum of the three distal peduncular joints, ai-jointed. Labrum without 

 any trace of processes from the antero-lateral angles. 



First thoracic segment (fig. 6 b) above at the antero-lateral angles with a somewhat small, oblong, 

 obtuse process having a couple of minute spines at the end; second segment with subsitnilar processes 

 .uul, besides, with a second pair of quite small processes above the middle of the lateral margins, and 

 \\ith some very small protuberances in a transverse row not far from the front margin; third segment 

 with the antero-lateral processes short, and the second pair wanting, while some tubercles near the 

 .interior margin are distinct; fourth segment without lateral processes, but with the dorsal tubercles. 

 Fifth segment in a small specimen somewhat less than four and a half times as long as broad at the 

 middle, a little longer than the remaining posterior part of the body, subcylindrical to somewhat from 

 terminal widened part 



First pair of thoracic legs (fig. 6d) robust; fifth joint about half as long again as deep; each 

 of the two long and strong distal spines has a minute seta somewhat from the end, and the long 

 terminal margin has a short spine, a low minute plate with the end trispinose, and some exceedingly 

 tiny spines; sixth joint is somewhat shorter than the fifth, about twice as long as broad, and its lower 

 margin has beyond the middle a single, short, thick spine with a seta on its middle; seventh joint with 

 claw somewhat robust, and longer than the lower margin of sixth joint The other six pairs of legs 

 have the second joint scabrous, as it is set with numerous minute, sharp granules. The second joint 

 of fourth pair reaches, when directed backwards, a little beyond the end of second joint of fifth pair, 

 when stretched forward. 



The abdomen in the small specimen narrow, a little more than half as long again as broad; 

 the part between the uropods moderately produced, with the hind margin nearly semicircular; each 

 lateral margin has somewhat in front of the uropods a conspicuous process (as in the male, PI. VI, 

 fig. i a) directed backwards and outwards, and with the end truncate. Operculum (fig. I c) conspicuously 

 longer than broad, with the posterior margin considerably convex. - - Uropods short, scarcely half as 

 long as the breadth of the abdomen. 



Length of the small female 2-5 mm., of the large specimen, judging from the length of the 

 preserved portion, about 3-9 nun. 



Male. Two specimens, one without the first segment and head, the other without head and 

 the three anterior segments, were found. 



The thoracic segments as to processes and sharp, more or less spiniform tubercles about as in 

 the female. Fifth segment (fig. 6 a) respectively four and a half and nearly five and a half times as 

 long as broad before the middle, a little longer than the posterior part of the body, and its major part 

 snbcylindricaL 



Abdomen (PI. V, fig. 6 a; PL VI, figs, i a and i b) broader than in the female, a little less or a 

 little more than half as long again as broad; the processes on the lateral margins somewhat before 

 their ends well developed, directed backwards and somewhat outwards and downwards; the median 

 dorsal longitudinal area conspicuously broader than one of the lateral areas. Operculum (fig. i b) a 



