Classification of the Decapod Crustaceans. 4C7 



Cyclometopa by sucli easy transition and, even in typical 

 genera, dilFer from tliem so little that their separation is a 

 needless and misleading complication of the system. It 

 would, in fact, be logically necessary, if a grou|) Cyclometopa 

 were to be retained, to balance it by dividing the otlier 

 brach}rhynchous crabs into equivalent sections somewhat as 

 ibilows : — (1) Corystida', (2) Portunida?, {',\) Potamonida?, 

 (4) Atelecyclidai and Oancrida', (5) Xanthida; and Gono- 

 placidaj, (6) Pinnotherida3, (7) ? Ptenoplacidae and Palicida, 

 (8) Hapalocarcinida}. 



VIII. 



A Table of the Classification of the Crustacea Decapoda. 



Suborder NATANTIA. 

 Tribe P en ^e i d e s. 



Families: PenaeidiB (subfamilies: Cerataspina!, Arista;ina),Si( yo- 

 ninae, Penajinoe), Sergestidte (subfauiilies : Sergestiiuc, 

 Amphioninae, Leuciferiuie). 



Tribe C a e i D e s. 



Superfainily Pasiphcsoida. 



Families : Bresiliidte, Pasiphaiidae. 

 Superfamily Hoplophoroida. 



Families : Hoplophorida>, Nematocarcinida;, Atyidae. 

 Superfamily Stylodactyloida. 



Family Stylodactylidae. 

 Superfamily Psalidopodoida. 



Family Psalidopodidae. 

 Superfamily Pandaloida. 



Family Pandalidae (subfamilies : Thalasaocarinao, Pandalinac). 

 Superfamily Palayaonoida. 

 Families : Alpbeidae, Hippolytidae, Khynchocynetidae, Pal*- 

 monida) (subfamilies : Hymenocerinae, Pontoniinae, Palae- 

 moninse). 

 Superfamily Crangonoida. 

 Families : Gnatbophyllidae, [Autonomscidae ?], Processidac, 

 Glyphocrangonidaj, Crangonidae. 



Tribe Stenopides. 

 Family Stenopidae. 



Suborder REPTANTIA. 

 Tribe 1' a l i n u n a. 



Superfamily Eryonidea. 



Family ]*]ryonida3. 

 Superfamily Sci/Uan'dea. 



Families : Scyllarida), Palinurid;c. 



Tribe A ST AC UK A. 



Families : Nephropsidae, Paraatacidac, Potamobiida;. 



