SYNOPSIS 



GENERA OP NORTH AMERICAN CRUSTACEA HITHERTO OBSERVED. 



I. DECAPODA. 



Libinia, Leptopodia, Hyas, Mithrax, Xantho, Panopeus, Platycarcinus, Pilumnus, Carcinus, Platy- 

 onichus, Lupa, Pinnotheres, Ocypoda, Gelasimus, Sesarma, Nautilograpsus, Plagusia, Ilia, 

 Hepatus, Lithodes, Hippa, Pagurus, Porcellana, Monolepis, Callianassa, Astacus, Homarus, 

 Crangon, Alpheus, Hippolyte, Pandalus,. Palemon, Peneus, Mulcion. 



II. STOMAPODA. 



MysiSj Diastylis, Squilla, Gonodactylus. 



III. AMPHIPODA. 



Orchestia, Talitrus, Gamrnarus, Amphithoe, Cerapus, Lepidactylis, Unciola, Hyperia, Podocerus. 



IV. LCEMIPODA. 



Cyamus, Caprella. 



V. ISOPODA. 



Idotea, Stenosoma, Anthura, Sphaeroma, Noesa, Cymothoa, Limnoria, Asellus, Ligia, Philoscia, 

 Oniscus, Porcellio, Armadillo, Fluvicola. 



VI. PCECILOPODA. 



Polyphemus, Argulus, Caligus, Anth'osoma, Pandarus, Cecrops, Lernea, Penella. 



VII. PHYLLOPODA. 



Apus. 



VIII. LOPHYROPA. 



Cyclops, Scopiphora. 



IX BRANCHIOPODA. 



Branchipus. 



X. OSTRAPODA. 

 Cypris, Cytherina, Daphnia. 



