OP THE ' SOUTHEEN CBOSS' EXPEDITION. 49 



Genus Tbtphosa, Boech, 1870. 



T. Adarei, n. sp. (PI. 8. figs. 38-44.) 



Cape A dare, Nov. 4 & 5, 1899. 26 fath. 



Body moderately compressed. Segments of mesosome in- 

 creasing in length successively. First 4 side-plates deeper than 

 their segments ; 5th side-plate wider than deep. Posterior angle 

 of the Srd metasome-segment obtuse, the hind margin convex, 

 smooth, loiver margin straight. First segment of urosome with a 

 dorsal depression. 



Head as long as the 1st segment ; lateral angle subacute. 

 Eyes geuerally not discernible, probably red, reniform. 



Mouth-organs normal. 



Upper antennae : 1st joint of the peduncle stou;^ as long as the 

 other two joints and 1st joint of flagellum ; 2nd and Srd joints 

 very short. Flagellum with 13 joints in the female, 24 joints in 

 the male. Accessory aj)peudage 6-7-jointed, reaching beyond the 

 5th joint of the flagellum, the 1st joint longer than the next two. 



Lower antennse : 1st joint short and thick, 2nd about the 

 >ame thickness and. twice as long, the Srd more slender and one- 

 ihird longer than the 2nd ; flagellum with 21 joints in the 

 female, 31 in the male. 



First gnathopods : side-plates narrowed, and rounded below, 

 with a small tooth at the distal end of the hind margin. First 

 joint considerably longer than the next tliree ; anterior margin of 

 the carpus almost as long as that of the propodos, which has the 

 proximal half of the posterior margin somewhat dilated and 

 furred ; palm oblique, setose, with very strong defining spines 

 and a smaller spine placed obliquely at the base of the dactyliis ; 

 this is strong, with a secondary tooth. 



Second gnathopods : propodos five-sixths the length of the 

 hind margin of the carpus ; dactylus distinct. Side-plates 

 oblong, widening downwards, with a small tooth at the hinder 

 angle, not shown in the figure. 



First and second pergeopods : side-plates somewhat dilated 

 below, the front margin rounded, the hind margin with a small 

 tooth and setule ; 4th and 5th joints spinous on the hind margin. 



Third peraeopods : side-plates as wide but not as deep as the 1st 

 joint, which is almost as wide as deep, narrowing below and much 

 longer than the next three joints. 



Fourth peraeopods longer and stronger than the Srd and 5th, 

 the 1st joint oblong. 



LINN. JOUEN. — ZOOLOGT, VOL. XXIX. 4 



