4G() 



Mr L. A. Borradaile on the 



(molar process). The palp comes and goes from genus to 

 genus. 



The following tree is an attempt to represent diagram- 

 matically the course of the evolution of the Carides : — 



Palaemonoida. 



Stylodactylidte. 



Pasiphseidae. 



Bresiliidte. 



Prialidopodidae. 



NematocarcinidaB. 



Atvidse. 



Hoplopborid«. 



vir. 



In discussing the classification of the crabs, I have else- 

 where * suggested, among other clianges, the abolition of the 

 distinction between the groups Cjclometopa and Catometopa. 

 The families gathered under the latter name have probably 

 genetic affinity, at least in some cases, but they pass into the 



* Gardiner's * Fauna of the Maldives/ vol. i. p. 425. 



