WHEEL-BEARERS. 



243 



the lorica unusually thick ; this is, however, an optical 

 illusion, dependent on its dilatation into those angular 

 wings already noticed. The cavity penetrates into them ; 

 for in one of these specimens I see those curious twisted 

 threads that are believed to be connected with respira- 

 tion, within the lateral wings. The stomachs are 

 generally full of green and brown food, but they will 

 not imbibe carmine. 



SKELETON "WHEEL-EEAREB. 



Let us look, however, a moment longer at the singular 

 foot. Between the first and second joints there are two 

 projecting spines ; these differ much in different indivi- 

 duals as to their length, slenderness, and direction ; some- 



r 2 



