PLATE 11. 
Fig. 1.— Astacus klamathensis Stimpson. o. Portland, Or. U.S.N.M.jslightly enlarged. Show 
the chelipeds of normal shape. : : , 
Fig. 2.— Astacus klamathensis Stimpson. <. Portland, Or. U.S.N.M.,slightly reduced. Showir 
the abnormal, atavistic form of the regenerated claw of the left side. ‘ 
