OF THE ' SOUTHEEN CROSS ' EXPEDITIOIi. 43 



Head as long as the first 2 segments, lateral angle produced 

 herfond the end of the 1st joint of the lower antenna', acute. Eyes 

 almost obliterated, apparently oval. 



Upper antennae about as long as tbe head and first 4 segments; 

 1st joint thick and as long as the next two and first 2 joints of 

 the flagellum united ; flagellum 15-jointed, Accessory appendage 

 2-jointed, the 1st nearly twice as long as the 2nd. 



Lower antennae : first joint short, 2nd and 3rd nearly twice as 

 long, subequal. 



First gnathopods : side- plates oblong, narrowing slightly 

 downwards. First joint almost as long as the next four; the 

 2nd, 3rd, and 4th subequal in length and about as long as the 

 5th ; the 4th triangular and produced behind in a short lobe : 

 the propodos wide, scarcely dilated distally, palm rather oblique, 

 dactylus with a minute secondary tooth near the point. 



Second gnathopods as in C. crenatipalmatus, Steb. 



Peraeopods : first and second nearly as in G. crenatipalmatus: 

 side-plates of the 3rd rather wider than, but not so deep as the 1st 

 joint, which is oblong and as long as all the remaining joints ; 

 the 3rd joint short and wide; dactylus half as long as the 5th 

 joint. The last two pairs resemble the 3rd, but the 1st joint is 

 wider, all being about the same length and with the hind margin 

 of the 1st joint serrate. 



Uropods: peduncles of the 1st a little longer than the rami, 

 a few small spines on the inner side ; rami equal, without spines 

 or setae ; peduncles of the 2nd shorter than the equal rami, 2 or 

 3 small spines on the inner margins ; peduncles of the 3rd about 

 two-thirds the length of the outer ramus, with 2 short spines on 

 the inner margin near the end, inner ramus slightly shorter than 

 the outer, both with a few long setae on the inner margins. 



Telson cleft nearly to the base, with a terminal spine in an 

 unequal-sided notch on each division. 



Length 6 mm. 



Very near G. crenatipalmatus, Steb., but differs in the shape 

 of the hand of the 1st gnathopod, the armature of the telson and 

 uropods, and the less upturned and blunter angle of the 3rd 

 metasome-segment. 



Named after Nicolai Hanson, the Naturalist of the ' Southern 

 Cross ' Expedition, who succumbed to the terrible rigors of the 

 climate in Oct. 1899. 



