19G G- 0. SARS, 



The 3 posterior pairs successive]}' increase in length, and liave their 

 outer part fringed with scattered fascicles of spines and delicate bristles, the 

 dactvlus being rather stout and curved, with a small denticle somewhat in- 

 side the tip. The antepenultimate pair are much shorter than any of the 

 other pairs and, as the succeeding pair, have the basal joint comparatively 

 small and narrowed distally. The last pair (fig. 13) differ from the preceding 

 pairs in the much larger size of the basal joint, which is oblong quad- 

 rangular in form, with the posterior edge nearly straight and edged with 

 scattered short hairs. 



The uropoda are very unequal in size, the ])enultimate pair (fig. 14) 

 being rather small, with the rami narrow linear and spinous only at the tip. 



The last pair of uropoda (fig. 15) are of considerable size, projecting far 

 beyond the others and nearly equalling in length the urosome. The basal 

 part is short and thick, and the rami very unequal, the inner one being ex- 

 tremely small and scale-like, whereas the outer is very large and pronoun- 

 cedly foliaceous in structure. It is nearly of equal breadth throughout and 

 terminates with a blunted tip carrying an extremely minute terminal joint. 

 The edges of the ramus are densely fringed with comparatively short, jiartly 

 ciliated set«e, and are besides armed with fascicles of slender spines. 



The telson (fig. 16) is comparatively rather fully developed, being con- 

 siderably longer than it is broad at the base, and projecting beyond the 

 basal part of the last pair of uropoda. It is divided by a deep cleft into two 

 obtusely pointed lobes, which are finely ciliated on the outer edge and carrie 

 each at the tip a single short spinule and a few delicate bristles. 



The adult male (figs. 17, 18) grows to a considerably larger size than 

 the female, reaching, when fully extended, a length of 16 mm. (excluding 

 the last pair of uropoda). 



The form of the body appears still more slender than in the female, and 

 is also more compressed. In a dorsal view of the animal (fig. 18) the body 

 therefore exhibits an extremely narrow, almost linear form. The sexual dif- 

 ferences otherwise refer chiefly to the antennae, the gnathopoda and the last 

 pair of uropoda. 



The antennae (see fig. 17) appear somewhat more elongated than in the 

 female, and also less unequal, the inferior ones being about same length as 

 the superior. In both pairs, moreover, the flagella are composed of a greater 

 number of articulations. 



The gnathopoda (figs. 19 and 20) are very different from those in the 

 female, being much more strongly built and nearly equal both in size and 

 structure. In both pairs the propodos is very large, oblong oval, or rather 

 somewhat clavate in form, gradually widening somewhat distally, with the 



4^H3.-MaT. CTp. 196, jg 



