Chap. II. EAETH SWALLOWED AS FOOD. 



107 



rise like towers (see Fig, 2), with their sum- 

 piits often a little broader than their bases, 



Fig. 2 



Towfer-like casting from near Nice, constructed of earth, voided 

 proDably by a species of Pericliseta : of natural size, copied from 

 a photograph. 



sometimes to a height of above 3 and often 

 to a height of 2^ inches. The tallest of those 



greatly surprised to see how closely they resembled castings sent 

 to me from near Calcutta, where it is known that species of 

 Perichjeta abound. 



