20 



TALPID^— TALPA 



Fig. 3.— Plan of Tunnels of 

 Simple Fortress. See also 

 Fig. 4. 



Fig. 4. — Section of Simple Fortress, plan of 

 which is shown in Fig. 3. 



CL . 



S. 7. 



Fig. 5.— Plan of Complicated Fortress, Fig. 6.— Plan of Complicated Fortress, 

 WITH Eleven Exits. with several Blind Terminals. See 



also Fig. 12. 



h. 



Fig. 7.— Section of Fortress on Marshy 

 Ground, with Old (Ni) and New (N2) Fig. 

 Nests. See also Fig. 8. 



-Plan of Fortress shown 

 IN Fig. 7. 



