282 «. 0. SARS, 



what unequal iu size, ])ropo(los of the anterior ones oval quadrangular, that 

 of the i^osterior considerably larger and more regularly quadrate iu outline, 

 palm in both pairs nearly transverse, defining angle armed witli 3 spines, 

 the outmost of which is particularly strong. Anterior ])airs of i)ereiopoda 

 less robust than in the ;5 preceding species, carj)al joint scarcely' expanded, 

 propodal joint armed with a double row of slender spines. Tlie 3 pos- 

 terior pairs of jjereiopoda rather much elongated aud densely sup|)lied with 

 bristles as also with fascicles of slender spines; basal joint of last pair 

 very much e.xpanded, with the posterior edge somewhat irregularly curved 

 and fringed with short bristles. The 2 anterior pairs of uropoda rather robust 

 and armed with strong sjtines. Last pair of uropoda reaching considerably 

 beyond the others, (mter ramus more tlian twice as long as the basal part 

 and edged with scattered non-ciliated bristles, terminal joint well defined; 

 inner ramus small, scale-like. Telson small, with the lateral lobes strongly 

 diverging, each with a single apical spinule. Length of adult female 10 ram. 



Bemarks. — The present form is chioitiy characterised by the shape of 

 the ])roi)odos of the posterior gnathopoda, which is more pronouncedly 

 ([uadrate than in any of the other known species: hence the specific name. 

 From the 3 i)receding species it is moreover easily distinguished by its less 

 robust body and by the structure of the antenme and caudal appendages. 

 In outer appearance this and the following species bear a strange resemblance 

 to the species of the genus I'o)ifoporeia. 



Description of the female. — The length of fully adult, ovigcrous sjieci- 

 mens is about 10 mm. 



The body (see fig. 1) is on the whole considerably more slender than in 

 the 3 preceding species, and also much less tumid, with the back evenly 

 rounded and quite smooth throughout, without any trace of the transverse 

 depressions found in N. coinjmctus. 



The cephalon is comparatively small, tliough somewhat e.Kceeding iu 

 leugth the 1st segment of the mesosome. The frontal edge is somewhat pro- 

 duced between the bases of the superior antenna', without, however, forming 

 any distinct rostral projection. The lateral lobes are rather prominent and 

 broadl\ rounded at the tip; behind them there is a rather deep emargination 

 encircling the large and swollen basal joint of the inferior antenna:. 



The anterior paii's of coxal plates are of moderate size, being somewhat 

 deeper than the corresponding segments, and are fringed distally with slender 

 set», which become rather short on the 4th pair. The 1st pair (see fig. 4) are 

 of about the same breadth throughout, and have the distal edge somewhat 

 oblique. The 2 succeeding pairs are regularly oblong (|uadraugular in shape. 

 The Ith pair (see fig. 6| are, as usual, the largest, being about as broad as 



*113.-MllT. cip. 190. iJ 



