824 CRUSTACEA. 



Plate 55, fig. 5 a, animal, enlarged ; b, portion of flagellum of supe- 

 rior antenna. 



Found with the preceding. 



Length, nearly half an inch. This species has nearly the same pro- 

 portional lengths between the thoracic segments as in the preceding. 

 The antennae are also similar, though stouter. The flagellum consists 

 of cylindrical joints, and at apex there is a seta on the under side 

 as long as the joint, while on the outer apex, the seta is not half as 

 long. This species differs from the preceding widely in the hands of 

 the second pair of legs, and moreover, it has two hooked spines to both 

 the second and third segments of thorax — one at middle of back and 

 the other posteriorly near articulation. The flagellum of the superior 

 antennae is about as long as base, or but little shorter ; the third joint 

 of base is not longer than first. The fourth joint of inferior pair (as 

 in the tenetta), is slender and much longer than the following portion, 

 which appears to consist of three joints. Finger of hand of second 

 pair nearly as long as hand. 



The feet of the second pair in the specimen figured, were attached 

 quite near the anterior extremity of the segment, as in females ; con- 

 sequently this is probably of the same sex with the specimen of the 

 tenetta described, and the two are not, therefore, male and female of 

 the same species, as might be deemed possible from the general simi- 

 larity of habit. 



It is possible, however, that the rule with regard to the second pair 

 of legs in the Caprellaa may not hold for these species, and the two, 

 the tenetta and aculeata, may then be male and female of the same 

 species. The hands of the second pair correspond with this view, the 

 tenetta having a male character, and the aculeata a female character. 

 As our specimens are not in the collections for farther study, we can- 

 not settle this point. 



