OCR Text |
Show 1878.] AND DISTRIBUTION OF THE CRAYFISHES. 765 Fig. 5. Astacopsis franklinii. I The outer face of the podobranchia of the antepenultiinate thoracic limb of the left side (X'Si). II- Tbe inner face of the same podobranchia: br, branchial filaments; I, rudimentary lamina. II a. The apex of the same, more highly magnified. III. A transverse section of the podobranchia at about the junction of its middle and upper thirds. IV. The extremity of one of the hooked filaments ; and V, that of one of the hooked setae. In these two figures the vertical line represents ^ ^ of an inch magnified to the same extent. VI. The coxopoditic seta; ( X 3i). |