902 CRUSTACEA. 



sixth pairs subequal; seventh very short, the coxa of moderate size, 

 the following part but slightly longer. 



Plate 68, fig. 3a, animal, enlarged; b, under view of head; c, an- 

 tenna ; d, second pair of feet ; e, termination of fourth pair ; /, fourth 

 pair ; g, extremity of abdomen. 



In the Pacific, latitude 2° south, longitude 175° west. Collected, 

 March 30th, 1841, attached to Medusae. 



Length, three lines. The shape of the head is peculiar; it narrows 

 forward to a rounded-obtuse front, as seen in profile. The antennas 

 are much shorter than the head, and project from its under surface ; 

 there are a few short setae on outer side near middle. The setae of 

 the legs are all short, much less than the diameter of the joints, and 

 the claws also are very short. The four anterior legs are but little 

 more than half the length of the third and fourth pairs. The last 

 abdominal segment is very small, short ovate, and the preceding is 

 subquadrate, with the sides excavate. The stylets have lanceolate 

 extremities, and the second pair extend hardly as far back as the 

 extremity of the abdomen. The last pair has the branches much 

 unequal, the inner nearly half the longer. 



Daira? depressa. 



Corpus depression, latum. Caput lateraliter supernlque visum transver- 

 sum, hemispliericum. Thoracis segmenta subo?qua. Antennas duos, 

 parvulm, k-artiadatw, articulo ten*tio longiore quam secundus. Pedes 

 toti fere nudi; 4 antici parvi; secundi paris manus paulo transversa, 

 infra serrulata, apice inferiore non prominente; paris manus primi 

 subquadrata, infra serrulata, apice inferiore triangidate produeto, 

 margine palmw integro. Pedes secundi tertiique longiores subasqui; 

 quinti sextique subwqui, coxis laiis ; septimi parvidi, coxa midto bre- 

 viore, valde angustd, parte reliqud minutd (dimidio breviore quam 

 coxa) . 



Body depressed, broad. Head seen in profile or from above, trans- 

 verse, hemispherical. Segments of thorax subequal. Antennae 



