REPORT ON THE AMPHIPODA. 069 



Euonyx normani, n. sp. (PL XIX.). 



Bostrum rudimentary, lateral lobes of the head rounded between the upper and lower 

 antennae ; back rounded ; postero-lateral angles of the first pleon-segment rounded, of 

 the second acute, of the third blunt, fourth pleon-segment with a dorsal depression, sixth 

 with lateral ridges on the back curving a little outwards as they reach the telson, this 

 segment on the under side being produced into a point between the peduncles of the 

 third uropods. 



Eyes not very distinct, apparently forming a narrow oval on the sides of the head, 

 midway between the front and back. 



Up'per AntenniB. — First joint stout, subcylindrical, somewhat longer than its thick- 

 ness at the base ; two following joints very short, the third being deeply excavate for the 

 brush-surface of the flagellum ; the flagellum of twenty-nine joints, the first with a thick 

 brush of cylinders in some sixteen rows, the joint equalling in length the five following 

 united ; stout spines on some of the earlier joints, stifi' little cilia on all, the twenty-eight 

 joints varying irregularly in length. Secondary flagellum of nine or ten joints, of which 

 the first three equal the first of the primary. 



Loiver Antennie.—Yivst joint dilated below, gland-cone long, projecting nearly as 

 far forwards as the distal end of the short third joint ; fourth joint longer and thicker 

 than fifth, with one or two terminal spines ; fifth joint long, almost unarmed ; flagellum 

 of thirty-five joints, with very short, stout, distal cilia. 



E'pistome. — The front edge presents two curved lobes with an emargination between 

 them, the lower lobe being much the more curved and prominent, the edge becoming 

 straight lower down to the junction with the upper lip, the frontal portion of which is less 

 prominent than tlie epistome. 



Mandibles.— Q-atting edge convex, with a small tooth above, and two small teeth 

 behind the lower angle ; secondary plate of left mandible small, strap-shaped, probably 

 dentate at the tip ; spine-row of three rather stout, curved spines, followed by small 

 feathered setse or cilia ; the molar tubercle projecting far back, ciliated, not dentate ; 

 the articular condyle projecting far forward ; the palp set well back, but not very far 

 liack as in OrcUomene and Lepidepecreum, its first joint not extremely short, the second 

 long, narrowest at the base, without constriction, since the muscles of the upper and 

 lower portions overlap considerably ; the row of spines of the upper portion begins some 

 way from the inner margin and apically does not reach the outer margin ; it is, as usual, 

 on the outer surface of the palp ; the third joint is short, narrow at base and apex, with 

 both margins convex, on the inner one carrying twenty pectinate spines, and two near 

 the base and outer margin. In the Plate, the outer surface of the right mandible is 

 figured so that the spine-row and molar tubercle are not visible, and the upper tooth of 

 the cutting edge is turned inward out of view ; the spines of the second joint of the palp 



