136 



THE VOYAGE OF H.M.S. CHALLENGER. 



The antennal scale (see fig. 9) does uot quite reacli to tlie end of the second joint of 

 the antennular peduncle, and would seem to be a trifle broader than in the last species. 



The first pair of legs (see fig. 8) are comparatively shorter than iu any of the preced- 

 ing species, but in other respects resemble those in Nematoscelis tenella. The terminal 

 joint expands gradually toward the a]3ex, which is abruptly truncate, and provided with 

 five spines, one of which projects appreciably beyond the rest. 



The gills exhibit much the same simple appearance as in the last species. 



The caudal fan, likewise, would not seem to exhibit any essential difference iu its 

 structure from that in Nematoscelis tenella. 



Habitat. — Several specimens of this form were collected during the Expedition, but 

 the greater part are more or less defective. All were taken in the tow-net. Tlie 

 localities are the foUowins : — 



As regards distribution, it would appear from the above given localities, that the 

 species is met with throughout the whole of the Atlautic, occurring also iu tlie Pacific. 



Genus 7. Stylocheiron , G. 0. Sars, 1883. 

 Stylocheiron, G. 0. Sars, Preliminary Notices on the Challenger Sohizopoda. 



Generic Characters. — Form of body somewhat varying iu the different species. Eyes 

 more or less irregularly formed. Flagella of the two pairs of antennaj very slender, with 

 few and elongate articulations. Mandibles without palp. First pair of maxillaj wanting 

 exognath ; second pair small, with indistinctly defined masticatory lobes, fringed with 

 but a single row of slender setae. Maxillipeds feeble in structure, with greatly developed 

 cxopodite, but wanting epipodite. Legs rather dissimilar ; first pair of same appearance 

 as maxillipeds ; second pair greatly produced, geniculate, meral and carpal joints very 

 elongate and slender, naked, propodal joint somewhat swollen, and armed with strong 

 spiuiform bristles impinging against the curved spines arising from terminal joint, the 



