420 PKOF. C. CHILTON ON SOME TEEEESTRIAL 



flagellum consists of three joints, in other specimens it seems usually to 

 contain four. 



The mouth-parts show on the whole a pretty close resemblance to those 

 found in species of TricJwniscus and are almost the same as those of the 

 next species which are described in greater detail, it will therefore be only 

 necessary here to mention one point of difference; in the maxillipeds 

 (figs. 3 & 4) the epipod is widened at the base and narrows distally, and thus 

 looks somewhat different in shape from that of W. australis. 



The legs (fig. 5) are all short and of about equal length ; they are all 

 somewhat stout, the basal joint is rather broad and has a slight depression 

 on its outer surface to receive the more distal joints when folded back upon 

 it ; the carpus is broad and bears few setse, one towards the distal end being 

 much longer than the others ; the propod is much narrower than the carpus 

 and tapers towards its distal end, the outer surface is thickly fringed, especially 

 on the distal half, with fine rather long setse, while the inner margin bears 

 only one or two stout setee situated about the middle of the margin ; the 

 dactyl is long and slender and bears numerous strongly curved setae near the 

 base, from which also arises the long dactylar seta which projects a little 

 beyond the end of the dactyl itself, and is of the same general character as 

 in species of Triclwniscus. 



The pleopoda are also of the same general type as in Tricltoniscus and the 

 first and second pairs are specially modified in the male. In the first pleopod 

 (fio-. 6) the outer branch forms a delicate plate with curved outer margin 

 and minute crenulations at the distal end, the inner plate forms a narrow stout 

 process bearing at the end an extremely long, sharp style; the median organ 

 is broad, expanding towards its distal end, which is deeply emarginate with 

 a small nodule in the centre of the emargination, the basal part seems 

 somewhat strongly chitinized but the extremity appears thin and membranous 

 with a wrinkled appearance. The second pleopoda (fig. 7) have the outer 

 plate lamellar and of the usual shape, the inner branch being modified into 

 a strong biarticulate, cylindrical copulatory organ of nearly the same width 

 throughout its length except towards the end which narrows abruptly ; 

 alono- its inner side there runs a narrow groove which curves upwards 



towards the end. 



The 3rd 4th, and 5th pleopoda are similar to those of N. australis and 

 consist of an outer opercular plate and a smaller inner branchial plate, the 

 branchial plate apparently becoming smaller in proportion to the opercular 

 one in the more posterior pleopoda. 



The uropoda (fig. 8) have the basal joint expanded outwardly with strongly 

 convex margin, the two rami are somewhat widely separated, the inner one 

 being slightly the longer and more slender. 



In the female I have not succeeded in finding the first pleopoda, they are 



