



SYSTEMATIC INDEX. 





ARTICULATA with arti- 

 culated FEET. 



CLASS I. 



CRUSTACEA 



Their division into orders 

 MALACOSTRACA 



a. Eyes placed on a mova- 

 ble and articulated pe- 

 dicle 

 DECAPODA 



BRACHYURA 



Cancer 

 Pinnipedes 



Matuta 



Polybius 



Orythyia 



Podopthalmus 



Portunus 



Platyonichus 

 Arcuata 



Cancer proper 

 Clorodius 

 Carpilius 

 Xantho{\) 



Pirimela 



Atelecyclus 



Thia 



Mursia 



Hepatus 

 Quadrilatera 



Eriphia 



Trapezia 



Pilumnus 



Thelphusa 



Gonoplax 



Maci'opthalmus 



Gelasimus 



Ocypode 



Mictyris 



1 



6 



9 



12 



12 



13 



20 



21 



21 



22 



22 



23 



23 



24 



25 



26 



26 



27 



27 



27 



27 



27 



28 



28 



29 



29 



30 



30 



30 



30 



32 



32 



33 



34 



35 



(1) Those genera which we mention accessorily, either because they are but 

 slightly or not at all known to us, or because we unite them with others, are 

 printed in italics. 



Vol. III. (2) 





