148 



vided with only 2 unequal setae. Maxillipeds also less fully developed, with the 

 setae rather reduced both in size and number. Natatory legs very coarsely 

 developed, with some of the setae transformed in to slender spines; 1st pair not 

 peculiarly modified. Last pair of legs uniarticulate, the proximal joint being 

 wholly coalesced with the corresponding segment; distal joint comparatively 

 narrow, but armed in a manner similar to that in Hemicy plops. 



Remarks. This is a very distinct genus, differing in several points 

 rather markedly from the other known Clausidiidce. It ought however evidently 

 to be referred to that family, as the oral parts are built on much the same 

 type. It comprises as yet only a single species, to be described below. 



78. Hippomolgus furcifer, G. O. Sars, n. sp. 



(PI. LXXXII). 



Specific Characters. Female. Body moderately slender, with the 

 anterior ' division oblong oval in outline and scarcely applanated. Cephalic 

 segment occupying about half the length of the anterior division, and gradu- 

 ally narrowed anteriorly; rostral prominence small, but well defined. The 3 

 succeeding segments gradually diminishing in width, and having the epimeral 

 plates only slightly expanded. Last trunk-segment well developed, and almost 

 at broad as the preceding segment. Tail exceeding in length 2 /;s of the an- 

 terior division, and rapidly tapering behind; genital segment rather massive, 

 and exhibiting on each side, close to the base, a small dentiform prominence; 

 anal segment attaining the length of the 2 preceding segments combined. 

 Caudal rami exceedingly slender and narrow, being more than twice as long- 

 as the anal segment and slightly divergent, outer edge provided close to the 

 base with a small bristle, and at about the middle with another somewhat 

 larger bristle, the 2 middle apical setae well developed, the other 2 however 

 very small. Eye apparently wholly absent. Anterior antennae unusually short 

 and robust, being scarcely half as long as the cephalic segment, and clothed 

 with numerous diverging setae, some of which are short and curved, almost 

 spiniform and coarsely spinulose, others very long and slender; 1st joint rather 

 broad and produced in front to a short dentiform projection, behind to a 

 strong mucroniform spine; the 4 succeeding joints gradually diminishing in 

 size and lamellarly expanded in front; terminal joint simple, cylindric and 

 provided at the tip, in addition to the setae, with a strongly developed slender 

 aesthetask; a similar aesthetask being moreover attached to each of the 

 2 preceding joints. Posterior antennae comparatively feeble, though built 



