466 G. 0. SARS, 



on the Crustacea of that Sea. It is very nearly allied to G. Weidemanni, 

 and would seem to be generally found together with this species. On a closer 

 examination, it may, however, easily be distinguished by the more strongly 

 built antenna^, and especially by the very dense supply of delicate bristles 

 on the inferior ones. Moreover, the anterior pairs of coxal plates are com- 

 paratively smaller, and the gnathopoda of the female much feebler. Finally, 

 the mandibular palps are highly remarkable for tiieir extraordinary de- 

 velopment. 



Description. — The length of the largest male specimens amounts to 

 12 mm., and this form would accordingly seem to grow to a somewhat 

 larger size than G. Weidemanni. 



The general form of the body (see fig. 1 2) closely resembles that of the 

 said species, the back being broadly rounded and remarkably smooth. 



The cephalon is somewhat ])roduced in front between the bases of the 

 superior antenna}, and has the lateral lobes somewhat more prominent than 

 in the preceding species, and narrowly rounded at the tip. 



The anterior pairs of coxal plates are comparatively smaller than in that 

 species, and rather unequal, diminishing rapidly in size anteriorly. The 1st 

 pair (see fig. 16) are scarcely broader than the 2nd, and much less deep, 

 not being at all expanded in their outer part. The 4th pair exhibit a simi- 

 lar form to that in G. Weidemanni, but have the posterior expansion less 

 broad. 



The last 2 pairs of epimeral plates of the metasome are scarcely produ- 

 ced at all at the latei'al corners, being nearly rectangular. 



The urosome is perfectly smooth above, though, on a closer examination, 

 2 small, juxtajjosed spinules may be found, as in the preceding species, on 

 each side of the last segment. 



The eyes are comparatively smaller than in G. Weidemanni, and pro- 

 nouncedly reuiform, having a rather deep sinus anteriorly. 



The antennae, as in that species, are rather short and subequal in length, 

 but appear tobe more strongly built. The superior ones (fig. 13) have the 

 1st joint of the peduncle very large and massive, considerably exceeding in 

 length the other 2 combined. The flagellum does not quite attain the length 

 of the peduncle, and is only composed of 8 — 9 articulations, each having 

 posteriorly a rather dense fascicle of delicate bristles. The accessory ap- 

 pendage is nearly half as long as the flagellum, and is composed of 5 arti- 

 culations having, anteriorly, coarse, spiniform bristles. 



The inferior antenn;e (fig. 14) have the 3 outer joints of the peduncle 

 rather broad forming posteriorly rounded expansions, which are very densely, 



'I>H3.-MaT. CTp. 296. -1(5 



