264 



E. A. ANDREWS. 



and terminates in an oblique and somewhat hollowed face pos- 

 terior to the flabellum. This very simple representative of the 

 triangle of Cambarus and the scroll of the American and Euro- 

 pean Astacus, bears still a few setae, several upon the median and 

 two or three upon the external border. In this it is intermediate 

 between the above two crayfish. 



The entire appendage seems crude and clumsy, either primi- 

 tive or reduced. 



This appears again in the other species of Cambaroides, C. 



FIG. 10. 



FIG. ii. 



siinilis, Fig. 1 1 , which is like Japonicus but the setae are very 

 short and the flabellum more reduced. The dotted area in Fig. 

 1 1 is membranous. The posterior face is turned so that the 



