421 



outer ramus. 1st pair of legs with the inner ramus distinctly 3-articulate, 1st 

 joint 3 times as long as the other 2 combined, and carrying inside, at some 

 distance from the end, a slender seta, apical claw and seta of this ramus not 

 very slender; outer ramus much shorter than the 1st joint of the inner, its last 

 joint fully as large as the middle one, and having an additional small spine out- 

 side. The 3 succeeding pairs of legs with no seta inside the middle joint of the 

 outer ramus, 1st joint of inner ramus on the other hand setiferous; inner ramus 

 of 4th pair, as in the preceding species, distinctly 3-articulate. Last pair of legs 

 with the distal joint well defined and somewhat resembling in shape that in 

 L. attenuata, but of comparatively smaller size and provided with only 4 seta}; 

 inner expansion of proximal joint more produced, extending beyond the middle 

 of the distal joint, and carrying 4 somewhat unequal setae. 



Colour not yet ascertained. 



Length of adult female 0.68 mm. 



Remarks. In the distinctly 3-articulate inner ramus of the 1st pair of 

 legs, this form seems, it is true, to differ essentially from the other species com- 

 prised within the present genus; but as the other legs are built upon the very 

 same type as in the preceding species, and there is also a general resemblance 

 in the other structural details, I consider it quite unreasonable, solely on the ground 

 of the above-mentioned difference, to remove it from the other species of the present 

 genus. The specific name here proposed refers to the unusually long and slender 

 anterior antennae. 



Occurrence. Only some few specimens of this form, most of them in a 

 more or less mutilated condition, were picked up from samples taken in the 

 same locality as that from which the preceding species was derired. 



Leptomesochra eonfluens, G. 0. Sars, n. sp. 



(Suppl. PI. 43). 



Specific Characters. Female. General form of body resembling that in 

 the 2 preceding species, being very slender and narrow, sub-linear. Rostral 

 prominence very small, knob-like. Urosome fully as long as the anterior division 

 and scarcely tapering at all behind ; genital segment rather large, last segment 

 somewhat exceeding in length the preceding one. Caudal rami very short and 

 thick, being scarcely as long as they are broad at the base, each having outside 

 a thin bristle generally curved anteriorly ; apical setse of moderate length. Anterior 

 antenna? rather slender, equalling in length the first 2 segments combined, and 

 composed of 8 well-defined joints, the 2nd of which is the largest, 3rd and 4th 



56 Crustacea. 



