41 



linear in form, being however not, as usual, attached to the posterior distal 

 corner of the basal part, but to a quadrangular piece firmely connected with 

 the anterior corner and armed below with 2 strong, coarsely spinulose setae 

 curving downwards in front of the inner ramus. Oral parts very small and 

 scarcely extending beyond the edges of the epimeral plates, being however 

 apparently built on the type characteristic of the present genus. Posterior 

 maxillipeds distinctly 3-articulate, with the middle joint comparatively broad, 

 sub-lamellar, and densely spinulose inside, last joint provided with 4 some- 

 what unequal setae. Natatory legs well developed, with the basal part com- 

 paratively broad and muscular, rami rather slender, the inner one being in 

 1st pair somewhat longer than the outer, in the remaining pairs of about 

 same length. Last pair of legs broad, foliaceous, and closely contiguous along 

 the middle; distal joint oval in form, with the terminal lobes somewhat unequal, 

 the outermost one occurring rather in front of the other 2; marginal setae very 

 strong and coarsely ciliated, the 2 outermost ones distinctly defined at the 

 base, whereas the innermost one forms the immediate continuation of the 

 joint; appendicular bristle well developed and attached near the base of the 

 joint; inner expansion of proximal joint quite short, but rather broad, with 

 both setae remarkably strong and not defined by any suture at the base. 



Male nearly of same size as female and very like it in its outward 

 appearance, though having the urosome, as usual, distinctly 5-articulate. 

 Anterior antennae much larger than in female, and distinctly hinged, with the 

 3rd joint considerably enlarged and provided outside, at some distance from 

 the base, with a large sausage-shaped aesthetask extending backwards along 

 the side of the cephalic segment. 2nd pair of legs with the inner ramus 

 slightly transformed, being comparatively longer than in female, with the 

 terminal joint narrowly produced and quite smooth on both edges, tip car- 

 rying a short, somewhat flexuous spine and a slender seta. Last pair of legs 

 much smaller than in female, with the marginale setae shorter and all of them 

 distinctly defined at the base. 



Colour of the living animal not yet ascertained. 



Length of adult female 0.82 mm. 



Remarks. This is a rather anomalous species, distinguished both by 

 the peculiar outward appearance of the body and by the structure of some 

 of the appendages. Especially is the structure of the posterior antennae very 

 peculiar and unlike that found in any of the other known species. 



Occurrence. 3 specimens of this remarkable form, 2 females and 1 

 male, have been examined by me. One of the female specimens was taken, 



6 Crustacea. 



