630 CRUSTACEA. 



appendages as long as segment, or exceeding it in length, furcate 

 part attenuate, the two processes very unequal. 



Plate 42, fig. 1 a, animal, enlarged ; b, young of same ; c, caudal 

 segment of young individual. 



South Atlantic, between Rio Janeiro and Rio Negro. Collected, 

 January, 1839, at 5 A. M. 



Length, five-eighths of an inch. Colourless; but two small greenish 

 spots in abdomen near its extremity. Carapax not half as long as 

 body; posterior medial spine long and stout; none between this and 

 those of the posterior angles, which are long and divergent. Beak 

 with a few minute spinules below. In the denticulations on lateral 

 margin of caudal segment there is a minute spine. Antennas much 

 shorter than the beak; inner branch five-jointed and a little the 

 longest. Second or largest pair of legs with finger very nearly as long 

 as hand. The hand has a stout spine on the margin quite near its 

 base, and then an emargination into which the extremity of the 

 finger closes; the palm is set with minute spinules. Eyes short obco- 

 nical ; bright green reflections from the pigment within. 



Figure 1 b, represents a half-grown individual, probably of the 

 same species. The carapax is very similar in form and in its spinous 

 processes. The abdomen has the row of dorsal spines, but they are 

 obtuse and appressed to the back, and the lateral spine is wanting. 

 The beak is not spinulous below. The caudal segment is broadest 

 posterior to the middle, instead of anterior to the same, and thus has 

 a similar mark of immaturity with our specimen of E. vestitm. This 

 segment is deeply triangulato-excavate posteriorly, and has the poste- 

 rior margin pectinate with spinules; on each side there are three 

 denticulations, but they are obsolescent. The third, fourth, and fifth 

 pairs of feet are rudimentary; they consist of a short cylindrical joint. 

 The three posterior thoracic pairs are also rudimentary. The abdo- 

 minal appendages are full grown, excepting the caudal pair, which 

 consist of the basal portion alone, and this is a little shorter than the 

 caudal segment. Eyes with bright green reflections; not as conical 

 m the pedicels as the adult. Length, one-fifth of an inch. Colourless. 

 Found with the preceding. 



