GEOGRAPHICAL DISTRIBUTION OF CRUSTACEA. 



1551 



6. GENERA COMMON TO THE THREE DIVISIONS. 



1. Maioidea. 



Pisa. 



Mithrax (mainly Occid.) 



Acanthonyx. 



2. Cancroidea. 



Xantho. 



Panopaeus (mainly Occid.) 



Pilumnus. 



Eriphia. 



Lupa. 



Amphitrite. 



Carcinus. 



Platyonychus. 



3. Grapsoidea. 



Grapsus. 



Goniograpsus. 



Sesarma (sparingly European). 



Acanthopus. 



Plagusia. 



Pinnothera. 



Calappa. 



4. Anomoura. 



Dromia (sparingly Occid.) 



Albunaea. 

 Porcellana. 

 Lithodes. 

 Paguristes. 

 Bernhardus. 



Pagurus (mainly Orient.) 

 Clibanarius. 

 Galathea. 

 5. Macroura. 

 Gebia. 

 Scyllarus. 

 Panulirus. 

 Palinurus. 

 Astacus. 

 Crangon. 

 Alpheus. 

 Betaeus. 

 Hippolyte. 

 Pandalus. 

 Palaemon. 

 Sicyonia. 

 - Penaeua. 



The following are lists of species common to two or more of the 

 three divisions. They may be much changed by further study, 

 through the discovery that the specimens from distant localities are 

 not conspecific. Should this happen, there is a relation indicated 

 based on their close similarity, which is important. 



1. SPECIES STATED TO BE COMMON TO DIVISIONS A. AND B., OR THE 

 AMERICAN AND THE AFRICO-EUROPEAN WATERS. 



Hyas coarctata; Massachusetts and Long Island, in United States ; France; England; 



Shetlands. 



Leptopodia sagittaria; Canaries; West Indies; Valparaiso. 

 Panopaeus Herbstii ; Mediterranean ; Key West, South Carolina, and New York, in 



United States. 

 Carcinus manas; Mediterranean at Nice; Crimea; England; Massachusetts, United 



States. 

 Grapsus pictus; Madeira; Peru and Chili ; (also various Pacific islands.) 



