SYSTEMATIC INDEX. 



ARTICULATA with arti- 

 culated FEET. 1 

 CLASS I. 



CRUSTACEA 6 

 Their division into orders 9 

 MALACOSTRACA 12 

 a. Eyes placed on a mova- 

 ble and articulated pe- 

 dicle 12 

 DEC APOD A 13 

 BRACUYURA 20 

 Cancer 21 

 Pinnipedes 21 

 Matuta 22 

 Polybius . 22 

 Orythyia 23 

 Podopthalmus 23 

 Portunus 24 

 Platyonichus 25 

 Arcuata 26 

 Cancer proper 26 

 Clorodius 27 

 Carpilius 27 

 Xantho{\) 27 

 Pirimela 27 

 Atelecyclus 27 

 Thia 28 

 Mursia 28 

 Hepatus 29 

 Quadrilatera 29 

 Eriphia 30 

 Trapezia 30 

 Pilumnus 30 

 Thelphusa 30 

 Gonoplax 32 

 Macropthalmus 32 

 Gelasimus 33 

 Ocypode 34 

 Mictyris 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. Ill — (2) 



