October, 1913. 



KNOWLEDGE. 



389 



Figure 401. Nummulites. 

 Magnified 25 diameters. 



Figure 403. An Orbitolite. 

 Magnified 25 diameters. 



Figure 404. A pinch of sand from the 

 South of France. Magnified 20 diameters. 



Figure 402. Fore and hind limbs of Seps. 



Figure 405. Seps tridactylus. 



