16 CRUSTACEA. 



others the distinction is obvious. In either case we have reason to 

 conclude, from the breadth and extent of this part of the body, that 

 the abdomen must have had its regular series of appendages. 



On this ground, we should conclude that the species are interme- 

 diate between the Isopoda among the Choristopods, and the Phyllo- 

 poda among Entomostracans, and properly fall into neither of these 

 divisions, though ranking most nearly with the former in perfection of 

 structure and general character. 



The following is a Tabular View of the Classification of Crustacea, 

 explained in the preceding pages. 



