CHAP. II. EARTH SWALLOV.'ED 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 ot earth, voided 

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

 a photograph. 



retimes 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 

 Perichjeta abound. 



