Chap. II. EARTH SWALLOWED AS FOOD. 



109 



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

 mits often a little broader than their bases. 





Fig. 2. 



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

 probably by a species of Perichseta : of natural size, copied from 

 a photograph. 



sometimes to a height of above 3 and often 



had any reason to suspect that the tower-like castings from Nice 

 had been formed by worms not endemic in the country, I was 

 greatly surprised to see how closely they resembled castings sent 

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

 PerichaBta abound. 



