portunid^:. 159 



Family II. Leucosiad^. 



Ebalia (Leach). Carapace lozenge-form, with 

 rounded angles ; front elevated. 



E. Pennantii. Fig. 301 ; n. s. 

 Bryerii. 

 Cranchii. 



Family III. Grapsid^. 



Planes (Leach). Carapace rather longer than 

 broad, nearly square, with the sides rounded, 

 convex ; front broad, thin and bent downwards. 



P. Linnaeana. Fig. 302 ; n. s. 



Family IV. Gonoplacid^. 



Gonoplax (Leach). Carapace four-sided, much 

 broader than long, narrowed behind; front the 

 whole width of carapace. 



G. angulata. Fig. 303 ; i n. s. 



Family V. Pinnotherid^e. 



Pinnothei^es (Latr.). Carapace nearly circular, 

 covering the inner antennae; mouth-cavity half- 

 moon-shaped. (Minute crabs parasitic within the 

 shells of living bivalve mollusca.) 



P. pisum. Fig. 304 ; n. s. 

 veterum. 



Family VI. Portunid^e. 



Polybius (Leach). Carapace nearly circular, 

 slightly narrowed behind : all the feet much flat- 

 tened ; last joint of fifth pair very large, oval, and 



