LOBSTER (HOMARUS VULGARIS)— CoNTi'- 



PLATE XIII. 



Fig. I. Longitudinal Horizontal Section iFemalej 



Flg.3. FRESH-WATER CRAYFISH (AST^CUS FLUVIATILIS; 

 5 g, (Female ) 



"M .V A K Joli.*li>n Uiluhut^ t- Lac 



