PLATE 12. 



Tig.— Astacus klamathensis Siimpson. cf. Portland, Or. U. S. N. M. XI. Both of the chelipeds 



are second growths, the left the older. 

 Fig. 2. — Aslacus klamalhensis Stimpson. cf. Portland, Or. IT. S. X. M. sMghtly reduced. Showing 



both claws regenerated, of full size, and nearly symmetrical; yet verj' different in shape from 



the normal claw as seen in Plate 11, Fig. 1. 



