18/8.] AND DISTRIBUTION OF THE CRAYFISHES. 



br 



767 



Fig. 6. 



Champs (?). 



1 T KfT8Se e f xsf P 0d0 T b , ranchia f the f -tepenultimate thoracic limb of 

 me left side ( X 6). II. The inner face of the same podobranchia • B basal 

 portion; ^, stem ; «Ula; Abranchial filaments. Ill Transverse sec 



T^lZrm"tTt V i° hr&n t a{ r 3 \ IV " A sickltsh^eThook^f 

 a Drancnial filament T ^ ^ of an inch in length. V. One of the coxonodit ic 



thTslT Th g P M c y T g f ified i ? th6 ™ u ^rential inflexion of theTah of 

 he seta. The central canal does not stop at this point, but is continued 



Th P V, ? )* S6ta - r V- A b,mdIe of coxopoditic set* ( x 3) VII 

 THp ™ \ 11 ° ne ° f the l0 "g set * of the P° sterior edge of tne stem' 

 The vertical line represents lhr of an inch magnified to the same extent 



