CLASS II. — CRUSTACEA. 



Ixi 



ARTICULATA. 



The following classes of Articulata have articulated feet or legs. 



CLASS II.— CRUSTACEA. 



This class is divided into two sections. 



Class. Section. 



Malacostraca 



iNTOMOSTRACA 



CRUSTACEA 



J I. Ma 

 ••(11. En 



The section Malacostraca is divided into five orders. 



Section. Order. 



1. Decapoda 



2. Stomapoda 

 Malacostraca . . <( 3. Amphipoda 



4. Lsemodipoda 

 ,5. Isopoda 



The first four orders embrace the genus Cancer of Linnaeus, and 

 the last that which he names Oniscus. 



ORDER I.— Decapoda. 



o 



(A 



< 



cq 





^ \ 



Family. Genus. Section. Subgenus. Example of Species. 



/ / /I. Matuta, Fab C. latipes, De Geer 



2. Polybius,Z««c/..{P°JJJ;'j; Henslowii, 



I. Natans. . . . / J Orithyia Fa&.... O. mamillaris, Fab. 

 \ 4. Podophthalmus, It.- t .. 



I J- '^ f "• spinosus, Latr. 



I 5. Portunus, Fab. • • For. Dufouiii, Latr. 



\6. Platyonichus, C!<i;.C. latipes, Plancus 

 /' 1. Cancer, prop. Fab.Q. Pagurus, L. 

 \ 2. Pirimela, Leach . . P. denticulata 



II. Arcuata.. . ^^- Atelecyclus, LeachA. Anglorum, Cuv. 

 \4. Thia, Leach . . . .T. polita. Leach 



#5. Mursia, Leach. . . . M. Africana, Cuv. 

 v6. Hepatus, Lat H. fasciatus, Latr. 



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