ANNULOSA : CRUSTACEA. 177 



formed by a great prolongation downwards of the pleura of the 

 thoracic segments, and the gills are attached to the bases of 

 the legs. 



TABULAE VIEW OF THE DIVISIONS OP THE CRUSTACEA. 



Sub-class I. EPIZOA (Haustellata) . 

 Order 1. Ichthyophthira. 



Sub-class II. CIEEIPEDIA. 



TBalanidse. 

 Order 2. Thoracica. . . <j Verrucidse. 



o ,177 ' T LLepadidae. 

 ,, 3. Aodommalia. 



4. Apoda. 

 Sub-class III. ENTOMOSTEACA. 



7. Cladocera. 



8. Phyllopoda. > Legion, Branchiopoda. 



9. TriloUta. J 

 10. Merostomata. 



Sub-class IV. MALACOSTEACA. 

 Division A. EDEIOPHTHALMATA. 

 Order 11. Lcemodipoda. 

 12. Isopoda. 

 ,, 13. Amphipoda. 

 Division B. PODOPHTHALMATA. 

 Order 14. Stomapoda. 

 15. Decapoda. 



Tribe a. Macrura. 

 ,, 6. Anomura. 

 c. Brachyum. 



CHAPTER XXXII. 



EPIZOA AND CIEEIPEDIA. 



SUB-CLASP I. EPIZOA (Haustellata). The members of this sub- 

 class of the Crustacea are in the adult state parasitic upon 

 the bodies of fishes, and are usually deformed ; but in the 

 young condition they are locomotive, and are furnished with 

 antennae and eyes. The mouth is suctorial, and the limbs are 

 terminated by suckers, hooks, or bristles. There are no dif- 

 ferentiated respiratory organs, but respiration is performed by 

 the surface of the body. The males are rudimentary, and are 



VOL. I. N 



