468 0. «• SARS, 



Remarks. — This is a very small species, but easily recognizable by 

 the slender body, the very unequal-sized anteun;e, the powerful structure 

 of the guathopoda in the male, the comparatively small size of tlie basal 

 joint of the last pair of pereiopoda, and finally, the armature of the urosome. 



Description. — The length of fully adult, ovigerous female specimens 

 scarcely exceeds 4 mm. ; that of male specimens is somewhat greater, at- 

 taining to 6 mm. 



The body in both sexes (see figs. 1 and 14) is very slender and com- 

 pressed, with the back smooth throughout. 



The cephalon (see fig. 15) about equals in length the first 2 segments of 

 the mesosome combined, and has the lateral lobes rather broad, but very 

 obliquely truncated, so as to form in front a somewhat prominent, though 

 blunt corner. 



The anterior pairs of coxal plates are not very large, though somewhat 

 deeper than the corresponding segments, and have their distal edge quite 

 smooth. The 1st pair (see figs. 4 and 16) are sliglitly expanded in their 

 outer part, whereas the 2 succeeding pairs (see fig. 5) are about same breadth 

 throughout. The 4th pair (fig. 7) are somewhat broader tlian the preceding 

 ones, and have the posterior expansion transversely truncated. 



The 2 posterior pairs of epimeral plates of the metasome are slightly 

 produced at the lateral corners, whereas the 1st pair, as usual, are rounded 

 and far less deep. 



The urosome (fig. 1 1) is smooth above, liaving only at the end of each 

 segment a few very small hairs. Laterally, however, each of the last 2 seg- 

 ments is armed with a single well-defined spinule. 



The eyes (see fig. 15) are rather large, occupying nearly the whole 

 height of the frontal part of the head, and exhibit ing an oblong oval 

 form. The visual elements are well developed, and the pigment dark. 



The superior antennae (fig. 2) are very slender and elongated, exceeding 

 half the length of the body, and have the 2nd joint of the peduncle about 

 same length as the 1st, though considerably narrower. Tlie flagellum is 

 fully twice as long as the peduncle, and filiform, being composed of 16 — 20 

 articulations. The accessory appendage is comparatively small, and tri- 

 articulate. 



The inferior antennse (fig. 3) are scarcely more than half as long as the 

 superior, and of normal structure. 



The gnathopoda are very different in the 2 sexes. In the female (figs. 4, 5) 

 they are comparatively small and feeble, and nearly equal-sized, but differing 

 somevvhat in the shape of the propodos, which in the posterior pair 

 (fig. 5) is a little more elongated, and slightly widens distally, with the 



