REPORT ON THE SCHIZOPODA. 



127 



eminently distinguished by tlieir great length and slender form, giving them a nearly 

 filiform appearance, hence the generic denomination. Four different species of this genus 

 are represented in the Challenger collection, a synopsis of which is given below : — 



■without any lateral 1 longer than hody. Eyes very large, . . N. megalops, G. 0. Sars. 



denticle. First pair V 

 of legs J shorter than body. Eyes couiparatively small, N. microjis, G. O. Sars. 



Carapace 



with a well-marked 

 lateral denticle. ^ 

 Rostrum 



acute, reaching to middle of basal joint of 

 antennulae. Body very slender, 



greatly produced, reaching beyond middle of 

 basal joint of autennulae. Body compara- 

 tively short, .... 



N. tenellu, G. O. Sars. 



N. rostrata, G. O. Sars. 



33. Nematoscelis megalops, G. 0. Sars (PI. XXIII. figs. 5-10 ; PI. XXIV.). 



Nematoscelis megalo]}s, G. O. Sars, Preliminary Notices on the Challenger Schizopoda, No. 31. 



Specific CJmracters. — Body rather thickset, gradually tapering from before backwards. 

 Carapace without any lateral denticles, anterior part keeled above, rostrum exceedingly 

 narrow, subulate, curving gently downward. Penultimate and antepenultimate caudal 

 segments slightly keeled above, and jutting out in the middle of the posterior margin as 

 small dentiform projections. Last segment longer than preceding; preanal spine 

 unguiform, with a small denticle at base. Eyes of enormous size, irregularly globose, 

 cornea contracted in middle. Antennal scale reaching almost to the tip of the antennular 

 peduncle, exceedingly slender, linear, apex narrowly truncate, with outer corner project- 

 ing. First pair of legs remarkably elongate and slender, attaining, when fully extended, 

 the length of the whole body, meral joint reaching far beyond tip of antennular peduncle, 

 propodal joint a trifle shorter than carpal ; terminal joint very minute. Telsou rather 

 elongate, with apex acutely produced ; subapical spines smooth. Inner plate of uropoda 

 longer than outer, and projecting beyond tip of telson. Length 26 mm. 



BemarJcs. — The present species may be regarded as the type of this genus, and is 

 chiefly characterised by the extraordinary length of the first pair of legs and the pro- 

 digious development of the eyes, as also by its remarkably narrow and curved rostrum, 

 and the slender form of the antennal scale. 



Description.- — All the specimens in the collection are females, the largest has a 

 leno-th of 26 mm. 



The body (PI. XXIII. figs. 5, 6) is rather thickset and but slightly compressed, 

 tapering gradually from before backwards, with the tail about twice the length of the 

 anterior division. 



The carapace is comparatively short, and lacks every trace of lateral denticles, the 

 inferior margins being perfectly smooth and slightly incurved in the middle. The 



