270 THE SCHIZOPODA. 



Description. — Body scarcely robust, being conspicuously more slender 

 than in A^. boopis. — The frontal plate is a short triangle (fig. 5a) terminating 

 in a spiniform, long, or moderately long, horizontal rostrum which is very slender 

 from the base and somewhat compressed. The keel between the rostrum and 

 the cervical groove well developed. 



Eyes moderately large, black, constricted somewhat below the middle, 

 with the upper section somewhat deeper and very conspicuously thicker than 

 the lower (fig. 5b). — The antennular peduncles longer and conspicuously thinner 

 than in N. boopis; first joint with the outer margin very concave (fig. 5a), as 

 the joint widens considerably at the outer side towards the end, and from the 

 outer distal angle a long, spiniform process projects forwards, reaching beyond 

 the middle of the second joint, but somewhat distant from its lateral margin; 

 at the distal end the joint is above raised as a kind of low, subvertical, transverse, 

 setiferous lobe. The second joint is considerably longer than broad, and above 

 at the outer distal angle produced into a process which is lamellar at the base, 

 tapering considerably and with the distal half or nearly two thirds spiniform 

 (fig. 5d); the process is long, directed forwards and somewhat outwards and 

 upwards (figs. 5c and 5d). Third joint with the dorsal keel short and rather 

 low. — The antennal squama reaches nearly the middle of the third antennular 

 joint, is somewhat narrow and tapers considerably to the oblique or nearly ter- 

 minal margin; a distal outer tooth is very distinct; the terminal joint of the 

 peduncle of the endopod is slender (fig. 5b). 



The maxillulae (fig. 5e) with the distal lobe not broader than the proximal 

 and conspicuously longer than broad; the palp considerably longer and broader 

 than in A'^. boopis, overreaching considerably the distal lobe; a pseudexopod 

 is not developed but the middle part of the lobe is somewhat expanded forwards . 

 — The maxillae (fig. 5f ) with the main part conspicuously longer than broad ; 

 the palp even a little longer than the inner margin of the distal lobe and almost 

 twice as long as broad. Second pair of thoracic legs with fifth joint slightly 

 or scarcely longer than the sixtli. 



Abdomen with a dorsal spiniform process from the hind margin of tliird 

 to sixth segments; the process from third segment generally compressed and 

 longer than any of the others, but yet varying very much in length, being some- 

 times moderately short, sometimes about half as long as the fourth segment; in 

 three adult specimens this spine is rudimentary or wanting, but seems to have 

 been broken off or damaged before the animal was captured; the three other 

 spiniform processes vary also considerably in length ; the hind margin of first and 



