288 MANUAL OF NATURAL HISTOKT. 



cles usually very long, with the cornea pro- 

 duced; front narrow, recurved; fourth joint 

 of outer foot-jaws inserted on the external 

 angle of the preceding joint. 

 U. Family. — Angular-Crabs (Gonoplacidae). Ca- 

 rapace transversely quadrilateral; eye-pedun- 

 cles usually very long, cornea small ; front 

 very wide ; fourth joint of outer foot-jaws 

 inserted in a groove of front inner angle of 

 the third joint. 



12. Family. — Painted-Grabs (Grapsidse). Carapace 



sub-quadrilateral, depressed ; eye-peduncles 

 very short and thick ; front very wide, 

 strongly recurved ; fourth joint of outer foot- 

 jaws inserted at the middle of the anterior 

 margin, or at the outer angle of the third 

 joint; fore -legs usually short, hind- legs 

 compressed. 



13. Family. — Crested-Crabs (Calappidse). Carapace 



subcircular, gibbous, the front moderate, edges 

 thin or denticulate ; external antennae small ; 

 fore-legs strong, compressed, and elevated 

 above into crests. 



14 Family. — China-Crabs (Leucosiidse). Carapace 

 usually circular, porcellanous ; produced an- 

 teriorly with front and orbits at the end; 

 no branchial apertures before base of fore- 

 legs. 



15. Family. — Globular-Crabs (Corystidee). Cara- 

 pace more or less globular, usually rough ; 

 gill openings before base of fore-legs ; exter- 



