so)7ie undescribed exotic Crustacea. 189 



equal lengths, and a fourth 5 - articulate about as long as the two 

 which precede it. Of the three the 1st is somewhat thicker, and 

 perhaps shorter than the two succeeding. The inferior antenna has 

 the 1st joint very short, thick, and somewhat conical, and the 2nd 

 and 3rd much longer and thicker than the corresponding joints 

 of the superior, the apical remaining part, or 4th joint, being but 

 very slightly longer than either ; it also is composed of five joints. 

 Both sets of antennae are hairy, the hairs arising from the inferior 

 surface in a double row, and becoming longer as they approach the 

 apex of each of the first three joints ; in the remaining part they are 

 short, in threes or fours, and more resembling spines than hairs. Be- 

 tween the antennae stand obliquely upward two palpi, each composed 

 of two elongate filiform joints, the extreme with a very long brush 

 of hairs. Lower down we find three joints of another (maxillary ?) 

 palpus, the extreme joint being very minute, nearly as long, but not 

 so rotund as that upon which it rests, and not so hairy. The joint 

 supporting the head is small, appearing like a neck, and gives origin 

 to no legs. One pair however arises immediately in front of it from 

 the after part of the head, whose basal joints are small, the two 

 apical longer, more dilated and angulated, the angles giving rise to 

 pencils of hairs. From the inferior part of the apex, which is trans- 

 versely truncated, arises a short much-curved claw, not fitted into 

 any perceptible fissure in the under part of the joint. The 2nd pair 

 of legs arises from the 2nd ring from the head, and has the penulti- 

 mate joint extremely large, subquadrangular, with a large tooth pro- 

 jecting from the inferior posterior angle, and another smaller from 

 between it and the surface of articulation of the last joint. The 

 last joint arches over the above-mentioned teeth, and has a strong 

 hooked claw, arising from the inner side of the apex. The last pair 

 of legs have the same number of joints as those described, but they 

 are devoid of peculiarity, being subequal and tolerably cylindric. 



From the 8th annulus arises on each side one of those bifid hairy 

 appendages or fin-feet which are common to the Gammari. They 

 difi^er in no essential point from the appearances presented by them 

 in that tribe ; but from the inferior posterior part of the same ring, 

 and partially concealed by a lateral plate, is to be found on each 

 side a distinct leg, closely resembhng the third pair, but want- 

 ing the claw, a minute joint with a tuft of hairs replacing it. The 

 two succeeding annuli each offer one of these last, but they become 

 successively smaller and more filiform. 



The entire animal is about ^th of an inch long, exclusive of the 

 antennae, and it presents some peculiarities, with one exception. 



