IXTRODUCTION. 



Class CRUSTACEA. 



Subclass I. THORACIPODA, H. Woodw. (or Malacos- 

 tbaca). 



Legion 1. PODOPHTHALMIA. 

 Order 1. Decapoda. 



Suborder (a) Brachyura 



,, (6) Anomura 



,, (c) Macrura 



Order 2. Stomapoda 



Legion 2. EDRIOPHTHALMIA. 



Orders. Isopoda 



,, 4. Trilohita 



5. Amphipoda 



Subclass II. GNATHOPODA, H. W. (orExTOMOsmACA). 

 Legion 3. ME.ROSTOMATA. 



Order 6. Xiphostira, and Cyclus (?) 



,, 7. Eurypterida 



Legion 4. BRANCniOPODA. 



Orders. Phyllopoda 



„ 9. Cladocera. 



Legion 5. LOPHYEOPODA. 



Order 10. Ostracoda 



„ 11. Copepoda. 



Legion 6. AJSTCHOEACEPHALA. 

 Order 12. Rhizocephala. 

 „ 13. Cirripedia. 



(ffl) BaLANIDjB 



(b) Lepadid.^: 



Crustacean "Teeth," Eggs, and "Tracks" 



18 



41 



