310 G. 0. SAUS, 



The urosume (tig. 15) has all the segmeats very distinctl} defined, the 

 line of demarcation between the last 2 segments being fully as sharply 

 marked as that between the 1st and 2nd. 



The eyes are comparatively larger than in the other species, and of a 

 rounded form, with the pigment very dark. 



The superior anteun;i' are in the female (see fig. 10) about '/!. of tlie leugtli 

 of the body, in the male, as usual, somewhat more elongated, though not 

 nearly reaching half the length of tlie body. The peduncle is in tlie female 

 but sparingly setous, whereas in the male (see figs. 8, 11) it is densely 

 clothed below with slender bristles. In both sexes the 1st joint of the ped- 

 uncle is considerably' longer than the otlier 2 combined, and is armed below 

 with a single spimile placed at the eud of the joint. As in most other species, 

 the 2nd peduncular joint is more elongated in the male tlian in tlie female 

 (corap. fig. 10 and 11). The fiagelhun iu the female about equals the ped- 

 uncle in length, whereas in the male it is somewhat shorter. It is composed 

 of from 10 to 12 articulations. 



The inferior antennic are in the female (see fig. 10) comparatively small 

 and feeble, not even exceeding the superior ones in length. In the male (figs. 8 

 and 12) they are much more fully developed and rather slendei', equalling 

 about Yg of tiie length of the body. The penultimate joiut is scarcely at all 

 dilated, being almost cylindric in form, and in the male nearly attains the 

 length of tlu' last peduncular joint and the fiagellum combined. It is pro- 

 duced at the end posteriorly to a simple narrowly mucroniform projection, 

 which does not nearly extend to the middle of the succeeding joint, and 

 wholly wants any secondary tooth at the base. The last peduncular joint is 

 in the female quite unarmed, whereas in t!ie male there is a very slight 

 rudiment of a dentiform prominence near the base posteriorly. The fiagellum 

 is comparatively very short, being in the male scarcely half as long as the 

 last peduncular joint. 



Tlie gnatliopoda exhibit the structure characteristic of the genus. 



The 2 anterior pairs of pereiopoda (fig. 13) are somewhat more slender 

 than in the 3 preceding species, though they resemble on the whole tliose in 

 G. mucronatiim. As in that species, the moral joint gradually widens distully, 

 and is provided anteriorly with scattered slender setic. 



The last pair of pereiopoda (fig. 14) are moderately elongated, equalling 

 about half the length of the body. The basal joint is rather large and ex- 

 panded, whereas the outer joints exliibit the slender narrow form found in 

 most other species. 



The 2 anterior pairs of uropoda (see figs. 1 5), are constructed in the 

 usual manner, though the difl'erence in size is somewhat more pronounced 



<l»u3.-MaT. crp. 218. ^o 



