348 0. 0. SARS, 



with 2 spines, cleft ratlier wide. Lengtli of adult female 4 mm., of male 

 5 mm. 



Beniarhs. — This is a very small species, indeed the smallest as yet 

 known, and is also easily distinguished from the preceding species by the 

 comparatively stout body, the short and, as it were, gibbous urosome, and 

 by the structure of the gnathopoda and pereiopoda. 



Description of the female. 



The length of fully adult, ovigerous specimens scarcely exceeds 4 mm. 



The form of the body (see fig. 1) ajipears on the whole rather short and 

 stout, being not nearly so much compressed as in the preceding species. As 

 in the latter, the back is quite smooth throughout, and broadly rounded. 



The cephalon about equals in length the first 2 segments of mesosome 

 combined, and has the lateral lobes somewhat projecting and broadly round- 

 ed at the tip, being defined from the postantennal corners by a rather deep 

 emargination, encircling the large, globular basal joint of the inferior an- 

 tennae. 



The anterior pairs of coxal plates are nearly twice as deep as the 

 corresponding segments, and have their distal edge densely fringed with 

 delicate bristles. The 1st pair (see fig. 4) are slightly expanded in their 

 outer part, whereas the 2 succeeding pairs (see fig. 5) are almost of equal 

 breadth tliroughout. The 4th pair (see fig. 6) are, as usual, larger than the 

 pi'eceding pairs, being somewhat expanded below the posterior emargination, 

 though not nearly as broad as they are deep. 



The epimeral plates of the metasorae are well developed, the 1st pair 

 being, as usual, the smallest, and evenly rounded, whereas the 2 posterior 

 pairs terminate in an angle. 



The urosome (see fig. 1) is comparatively short and stout, without any 

 dorsal projections, but having the dorsal face of the first 2 segments strongly 

 convex, and as it were gibbous The 2nd segment is very short in its dorsal 

 part, being to some extent overlapped by the 1st, and, like the latter, has 

 dorsally a small fascicle of hairs, whereas lateral spinules are wholly absent. 

 The last segment has on either side a single small spinule, but no dorsal fascicle. 



The eyes are not very large, but of an oblong oval form, with well-de- 

 veloped visual elements and dark pigment. 



The superior antennae (fig. 2) are comparatively short, but little exceeding 

 in length V4 of the body, and have the 1st joint of the peduncle rather large, 

 nearly twice as long as the other 2 combined. The flagellum is about the 

 length of the peduncle, and composed of only 8 articulations. The accessory 



*H3.-MaT. CTp. 338. 6 



