No. 437] VARIATION IN LITHOBIUS FORFICATUS. 305 



What is the function of these 

 of coxae ? Coxal pores 

 are found on many ar- 

 thropods and are consi- 

 dered to be homologous 

 either with the setiger- 

 ous glands or with the 

 nephridial openings of 

 Chaetopods. In Peripa- 

 tus, according to Sedg- 

 wick ('95) page 19, a 

 series of pairs of glands 

 lie in lateral compart- 

 ments of the body cavity 

 with ducts opening on 

 the lower surface of the 

 legs. Peripatus has no 

 malpighian tubules but 

 has nephridia like those 

 of the Annulata, which 

 also open at the base of 



