316 CRUSTACEA DREDGED OFF PORT JACKSOX, 



Front about one-third the greatest breadth of the carapace, 

 and consisting of a main central lobe which is cleft in front, and 

 two lateral lobes which form the anterior angles of the orbits. 

 Between the cleft in the central lobe, and also between this lobe 

 and the anterior orbital angles, the characteristic extension of 

 the buccal cavern can be seen from above. The external orbital 

 angle also forms a conspicuous spine. 



The regions of the carapace are well delimited. The gastric 

 region is much swollen, but bej^ond the spines forming the front 

 none are present on either the carapace or limbs. 



The abdomen in the female is large and consists of 6 segments, 

 the terminal segment having the form of the broad semicircular 

 plate characteristic of the genus. 



The orbits are of moderate size. The eye-stalks are slender, 

 readily movable and slightly pigmented. 



Neither antennules nor antennae are capable of flexion beneath 

 the front; the former are much larger than the latter. 



The buccal cavern is long and deep, and the external maxilli- 

 pedes are correspondingly produced. Viewed laterally, these are 

 exceedingly convex in form. 



The chelipedes are equal, and shorter but more massive than 

 the second and third pairs of legs. The palm is swollen. The 

 fingers are of about the same length as the palm and are finely 

 serrate along their cutting edge. They leave a narrow gap 

 between their proximal third when closed. 



The second and third legs, which are approximately equal, are 

 more than twice the length of the chel«, and terminate in a long 

 slender curved dactylus. The bases of both pairs are visible 

 from a dorsal view. 



The fourth and fifth pairs are carried over the carapace, which 

 they slightly exceed in length. They are of hair-like tenuity and 

 both end in a hook-like dactylus. 



Two specimens were taken, both of which are unfortunately 

 females. One carries ova which for so small a crab are of large 

 size. 



