STALK-EYED CRUSTACEA 287 



nearly straight ; postorbital tooth small or wanting. Sides 

 bowed. Fourth joint of first pair of legs with inner distal 

 border dentate; fifth joint with a tubercle on the inner 

 surface ; hand smooth ; fingers deflexed. 



Range. — Gulf Stream, West Indies, Surinam, Falk- 

 land Islands, Peru, West Coast of Mexico, Alaska, 

 China, New Zealand, Natal, Gambia, Mediterranean, 

 France. 



B. External maxillipcdes without rhomhoidal gape : — 



7. Euchirograpsus. 



EiichirograpS2is . . Milne Edwards, Kingsley. 



Carapace depressed, subquadrate ; sides slightly bowed, 

 with three teeth behind the orbital angle ; orbits entire. 

 External antennae long, entering the orbit. Fourth joint 

 of external maxillipedes about half the length of the 

 third joint ; its outer distal angle rounded, its inner 

 excavate and bearing the fifth joint. 



Range. — Mediterranean Sea, West Indies. 



I. Euchirograpsus americanus. 



Euchirograpsus americanus . .A. Milne Edwards. 



The carapace is very flat, with the lateral edges 

 parallel ; the surface is slightly granular, and has short 

 hairs visible only under the microscope. The front is 

 straight, lamellous, advanced, and notched in the middle 

 line. Behind the orbital angle there are three spines, the 

 second the largest. The orbits are large and deep. The 

 external orbital angle is spiniform. The pincers are 

 angular, and have longitudinal ridges. 



Range. — Barbados. 



