I. Brachyurous Decapods. 
CLASS II. — CRUSTACEA 
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ARTICULATA. 
The following classes of Articulata have articulated feet or legs. 
CLASS II. — CRUSTACEA. 
This class is divided into two sections. 
Class. 
CRUSTACEA. 
Section. 
I. Malacostraca 
II. Entomostraca 
The section Malacostraca is divided into five orders. 
Section. 
Malacostraca . 
Order. 
1. Decapoda 
2. Stomapoda 
S. 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, 
Family. Genus. 
Section. 
I. Natans. . 
II. Arcuata. 
S 
l 
Subgenus. Example of Species. 
1. Matuta, Fab C. latipes, De Geer 
2. Polybius, £^d P °Le b ach HenS '° Wiii 
3. Orithyia, Fab O. mamillaris, Fab, 
4. Podophthalmus, ) n . T , 
Lam I * • spinosus, Latr. 
5. Portunus, Fab. • • Por. Dufourii, Latr. 
6. Platyonichus, Cuv.C. latipes, Plancus 
1. Cancer, prop. Fab. C. Pagurus, L. 
2. Pirimela, Leach . . P. denticulata 
3. Atelecyclus, Leach A. Anglorum, Cuv. 
4. Thia, Leach . . . . T. polita, Leach 
5. Mursia, Leach . . . . M. Africana, Cuv. 
6. Hepatus, Lat .. . . . H. fasciatus, Latr, 
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