STALK-EYED CRUSTACEA 293 



vertical, but having its inferior border strongly upturned 

 in front and arranged in a horizontal lamina. Frontal 

 lobes forming a transverse ridge, and deeply divided by 

 a smooth groove, central and wide, and by two lateral 

 fissures. Branchial regions plicate; anterior portion of 

 the carapace, especially the frontal, transversely ridged, 

 almost scaly. Middle and posterior regions of the cara- 

 pace well marked, and surrounded with fine folds or 

 ridges. The upturned portion of the front also ridged. 

 The sides of the carapace have no teeth behind the ex- 

 ternal orbital tooth. The fourth joint of the external 

 maxillipedes is very elongated, triangular, with its edges 

 strongly turned up, especially the internal, of which the 

 upturned border is very narrow. The legs have their 

 joints very compressed ; the sixth joint is relatively 

 wide, and the seventh relatively short. The fifth joint 

 of the first pair of legs is very granular, having a faint 

 depression, and the edge ornamented with granular spines. 

 Hands elongated, covered with granular punctures ; the 

 fingers longer than the palm. 



Range. — West Indies, St. Thomas. 



10. Aratus. 



Aratus H. Milne Edwards, 



Kingsley. 

 Sesarvia (part) H. Milne Edwards. 



Carapace trapezoidal, elongated, narrow behind ; sides 

 straight; front defllexed, very broad. External maxil- 

 lipedes as in Sesarma. Walking feet compressed ; the 

 last joint very short. 



