ggg CRUSTACEA. 



lum setose at base ; the inferior nearly as long as the body and 

 very slender. Anterior eight feet ciliate below; the first pair 

 smallest, third joint hardly longer than second, fourth broad and 

 oblong, hand small and nearly obovate, finger minute ; secoud pair 

 slender, ending in two rather long setae; fourth rather stout, 

 stouter than third, fourth joint broad and a little oblong, oblique at 

 apex, finger short ; six posterior pairs nearly equal, setae few and 

 short, coxae of fifth and sixth pairs broad, roundish, of seventh pair 

 narrower, and apex behind triangulately prolonged, subacute. 

 Caudal stylets slender, the intermediate pair shortest, 



Plate 68, fig. 6 a, animal, enlarged ; b, b', different views of man- 

 dible ; c, first pair of legs ; d, second pair, with branchia and fouette ; 

 e, third pair, with the same, and also the epimeral ; /, fourth pair, 

 with same and epimeral ; g, fifth pair, with same and epimeral ; h, 

 seventh pair, with branchia alone. 



Atlantic, latitude 8°-12° south, longitude ll°-14i° west; collected, 

 May 5th to 9th, 1842 ; also, latitude 4°-7° south, longitude 21°-25° 

 west; November 7th and 8th, 1838, 4 a.m. 



Length, one-sixth to one-twelfth of an inch. Colour, rich blue, to 

 nearly colourless with a tinge of rich blue along the venter or about the 

 articulations. The specimen here described has the back of the 

 thorax very slightly convex in a profile view. The head in the same 

 position is very obliquely truncate, and the antennae proceed from a 

 small excavation at its lower angle. The eye occupies the whole 

 breadth of the triangular head (as seen from above), and the facets 

 are in a continuous surface ; the pigment is round-elliptical in form. 



The antennae are very unequal in length. The superior are about 

 half the shorter, and are much less than half the length of the body. 

 They have a five-jointed flagellum, which is more than twice as long 

 as the base ; the first joint of this flagellum is much the longest and 

 is hairy above. The appendage to this pair is about as long as this 

 joint and is faintly three-jointed. The inferior pair has the base 

 much longer than the base of the superior, and about half as long as 

 the flagellum. The penult basal joint is much the longest, and the 

 preceding one is as long as the last. The flagellum is very slender 

 terete, and consists of about fourteen oblong joints. 



