508 ME. E. J. MIEBS OlSr CRUSTACEA. 



On the anterior margin of the carapace, between the points of 

 insertion of the eye-peduncles and antennae, is a small spine, pos- 

 terior to this upon the hepatic region a second spine, and beneath 

 the hepatic spine, upon the antennal region, a series of 2-4 spines 

 in an oblique series. The posterior margin of the cephalothorax 

 is deeply sinuated above ; the terminal half of the postabdomen 

 is inflexed and usually more or less adpressed to the ventral sur- 

 face of the body. The first segment of the postabdomen is the 

 shortest; the lateral lobes of the second to sixth segments are tri- 

 angular and acute in the male, broader and more rounded in the 

 female ; the terminal segment is elongate-oval, ciliated on the 

 posterior margin, with two longitudinal keels, each of which 

 is trispinose, on the upper surface, and with three spines on 

 the lateral margins. The eyes are short and sub cylindrical. 

 The anteunules are about as long as the cephalothorax, the 

 two flagella of equal length. The peduncles of the antennae 

 are short, not half as long as the outer scale ; the flagella 

 broken, but evidently much longer than those of the anten- 

 nules, and thickly clothed with loDg hairs ; the outer lamina 

 with the outer margin straight, denticulated in its distal half, the 

 inner margin strongly arcuate and ciliated. The outer maxillipeds 

 are slender, with long hairs on their inner margins, the joints 

 diminishing successively in length. The first and second pairs 

 of legs are very slender ; the chelae shorter and no thicker than 

 the wrists, those of the second pair longer than the first ; third 

 pair very much enlarged, the arm thickening to the distal ex- 

 tremity, near which is a small spine on the superior and exterior 

 margins ; the wrist very small, with a blunt subapical lobe on 

 its upper and lower surface : the hand ovate, slightly granu- 

 lated and hairy on its outer and inner surface, much larger 

 at base than the wrist ; the superior and inferior margins thin, 

 but scarcely carinated, and ciliated, the superior margin armed 

 with serrated teeth ; the fingers compressed, serrated on their 

 outer margins, meeting along their inner edges when closed, 

 acute at the apices, a blunt tooth on their inner margins. Fourth 

 and fifth pairs of legs slender and slightly hairy ; claws bispinose. 

 Eami of the appendages of the postabdominal segments ovatfr and 

 ciliated ; those of the penultimate segment serrated on their outer 

 margins and with long hairs on the posterior margins ; the inner 

 ramus longitudinally unicostate, the outer subtruncate at the 

 extremity and longitudinally bicostate. Length to end of ros- 

 trum about 1 inch 2 lines. 



