CKLSTACEA FROM THE FALKLAND ISLANDS. 361 



joint, tliougli well pronounced, is very slender and does not 

 reach the palm. In the second pair the process of the same 

 joint, instead of being very long and extending beyond the inner 

 corner of the palm, is very short and quite distant from the palm. 

 Moreover, the first antenna in the female is decidedly shorter 

 instead of a little longer than the second, and it has a flagellum 

 as long as the pedimcle instead of one only a little longer than 

 the peduncle's third joint. Here, it may be thought, are materials 

 for establishing a new genus, but that may wait, since the 

 discovery of intermediate foims might easily make it unnecessary. 



The organ of vision on the short rostrum is white in the pi-e- 

 served specimens. The fiist antennae have the first joint as long 

 as the second and much stouter, the third joint little more than 

 two thirds as long as the second, the flagellum of sixteen joints. 

 In the second antennae the last joint of the peduncle is longer 

 than the stouter penultimate ; the gland-cone of the second joint 

 is blunt-ended ; the flagellum is composed of twenty-two joints, 

 but fewer in a. smaller specimen. 



The trunk of the mandibles has the cutting-edge not strongly 

 dentate, the molar not very prominent, the thiid joint of the 

 palp much shorter than the setose second, each curved but in 

 opposite directions. The spine-row consists of five spines. The 

 inner plates of the lower lip are distinctly developed. The inner 

 plate of the first maxilla? is tipped with three small seta? ; the 

 elongate second joint of the palp has several setfe along the 

 outer margin and six spines on the distal pai-t of the inner. The 

 maxillipeds are like those in the type species. 



The oblique palm is longer than the hind margin of the hand 

 in the first gnathopod, but considerably shoiter than it in the 

 second. The first and second pera-opods are alike. The third 

 and fourth diflTer from them in the greater exjiansion of the 

 second joint. The fovirth difl'ers from the third by the gi-eater 

 size of its second, fifth, and sixth joints. In all four pairs the 

 sixth joint is notable for the dense clothing of setae along the 

 back or convex margin of the sixth joint. The small finger is 

 unarmed except for a microscopic unguis. The long fifth pera-o- 

 pods do not appear to be distinctive. 



The pleopods have two minute coupling-hooks on the inner 

 distal corner of the peduncle, and five coupling-spines on the 

 first joint of the inner lamus, which is very slightly shoi'ter than 

 the outer. The uropods have their long peduncles successively 

 shorter, in each case longer than their respective rami, which 

 are also long, in the first and second pairs the inner ramus 

 slightly longer than the outer, the spine armature throughout 

 rather slight. The telson scarcely longer than broad, with a 

 minute spinule at each rounded corner of the truncate distal 

 margin. 



The female specimen measured 9 mm. across the curve from 

 the rostrum to the end of the third pleon segment, so that if 

 straightened out the full length to the end of the telson might 



