MARINE CRUSTACEANS. 705 



base of second. Abdomen six-jointed, last segment triangular ; sides straight ; extremity rounded. 

 Caudal stylets not extending beyond abdomen, branches obtuse, outer much the narrower, not 

 longer than the inner. Feet short setulose.' 



Neither in this nor in the much fuller account given by Schiodte and Meinert can 

 I find any character except one to justify the separation of their C hirsuta from Dana's 

 G. hirticauda. Dana says that the outer branch of the uropod is ' not longer than the inner,' 

 and figures it as somewhat shorter. Schiodte and Meinert say that the inner branch is 

 scarcely shorter than the outer, implying that the outer if anything has the advantage, which 

 in their figure they give it very decidedly. But on the other hand they say that in their 

 own C. hirsuta the inner branch is much shorter than the outer. This again is borne out by 

 their figure and corresponds with what is observed in the specimens of the present collection. 

 All of them appear to have this particular feature, so that with reluctance I allow them to 

 stand under the name which seimrates them from Dana's original species. 



The body is depressed, so that here, as in other species of the genus, it shows the side- 

 plates even in a dorsal view. The very hirsute telsonic segment has bisinuate sides con- 

 verging to a rather broad slightly convex apex which carries eight spines. 



The first antennae are prominent and contiguous at the base, with a broad, not very 

 long, composite basal joint, only a little longer than the next or true third joint. The 

 flagellum has 11 joints, most of them carrying sensory filaments, the first joint much shorter 

 than the second. The second antennae have the first three joints very short, the fourth 

 subequal in length to the fifth, widest at its base, this character appearing in both sexes 

 and the young, but most developed in the male. The joints of the flagellum numbered 

 21 in one male specimen, but only 15 in another, 20 in a female, 14 in a little young 

 specimen. 



The mandibles end in a short uncinate tooth accompanied by a small trifid plate ; there 

 is a slight marginal prominence, perhaps representative of a vanished molar; the second joint 

 of the palp is the longest, both this and the third being in the distal part fringed with 

 setiform spines. 



The first maxillae have a narrow inner plate, slightly expanded at its apex; the outer 

 plate ends in a strong unciform tooth. 



The second maxillae are feeble, simple, with narrowly rounded apex. 



The maxillipeds are narrow, only the second joint elongate, the fourth and fifth with 

 length and breadth subequal in the male but broader than long in the female, the sixth 

 and seventh joints small in both sexes. 



The first gnathopods are short and stout, with four robust spines on the fourth joint, 

 between which and the sixth joint the fifth makes very little show. The spines on the sixth 

 joint are not robust. The finger is curved with a strong unguis. 



The second gnathopods have the fifth joint very short but quite distinct, being otherwise 

 very similar to the first gnathopods. 



The first peraeopods are very like the second gnathopods. In the following pairs the 

 fifth joint attains greater importance, and the joints from the third to the sixth have longer 

 spines and a greater variety. In the last three pairs the fifth joint carries several spinose 

 spines on the apical border. 



