90 Mr. P. W. Bassett-Smith 07i 



reaching so far backwards as the middle lobe ; the frontal 

 plate is narrow, convex forward, with a shallow median notch. 



Anterior antennce equal in length to half the frontal plate, 

 of the usual form. 



Posterior antennce three-jointed, the basal with a well- 

 marked sharp spur directed backwards, the end claw of mode- 

 rate size. Hamulus anterior in the form of a very minute 

 hook, with a dilated base, placed well towards the border 

 near the extremity of the posterior antennas. Rostrum not of 

 unusual length (as in A. Heckelii) , but less broad than long ; 

 the palp is simple, slender, sharp-pointed, and slightly 

 curved, placed near the base of the first foot-jaw and the 

 trunk, the point reaching a little in front of the latter. 



First maxilliped of the usual form, but near the middle of 

 the convex border of the second joint a minute hair is seen. 

 Second maxilliped quite distinctive, forming a very powerful 

 holding-organ, the basal joint being thick and muscular, having 

 at the inner end of the concave border a strong triangular 

 process, against which the large claw-like second joint is 

 opposable ; on the inner margin of the latter near the base is 

 a strong bristle. Furcula very small, the branches being 

 short, thick, and almost parallel; their length equals the 

 breadth between the points. 



First perceopod: first joint short, the second long, the lower 

 border fringed with fine hairs, the palmar carrying at the end 

 three hook-like hairs, the upper being the longest; at the 

 angle there is a long fine bristle, on the inferior border three 

 long plumose hairs of the usual form. Second of the usual 

 form : the third has, on the large flap-like basal joint, the two 

 small articulate branches placed close together at the edge, 

 but not overlapping one another; they are of small size. 

 The hamulus is small, but well-marked, the claw being 

 almost straight. Fourth perceopod three-jointed, at the extre- 

 mity of the last joint are three slightly curved claws, placed 

 close together, of nearly equal length ; at the juncture of the 

 second and third joints is a fourth claw. 



Genital segment about two thirds the length of thecephalo- 

 thorax, almost round in outline, except for being cut away in 

 the middle line posteriorly, forming there a shallow trian- 

 gular depression ; on the posterior border outside of this is 

 seen a very prominent plate projecting beyond the genital 

 segment, carrying three long plumose hairs terminally and 

 one on the outer border — these are the fifth perajopods ; there 

 is also a strong bristle from the genital segment, external to 

 these ; rising from the under surface of the genital segment, 

 in the middle line, are the true caudal plates^ which are short, 



