13(5 



THE VOYAGE OF H.M.S. CHALLENGER, 



The antennal scale (see fig. 9) does not quite reach to the end of the second joint of 

 the autennuUir 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 in any of the preced- 

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

 joint exjiands gradually toward the apex, 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 in its 

 structure from that in NematosceUs 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. The 

 localities are the foUomng : — 



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

 species is met with throughout the whole of the iVtlautic, occurring also in the Pacific. 



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

 Styloclieiron, G. O. Sars, Preliminary Notices on the Challenger Schizopoda. 



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

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

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

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

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

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

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

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

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



