1902.] A NEW ORGAN IN AN EARTHWORM. 165 



the posterior end of the body. Thei'e are then about twenty 

 pairs of these chambers which ai'e fully developed. In the 

 regions of the body where they are feebly developed, the pouches 

 present the appearance shown in the accompanying drawing 



Text-fig. 36. 



Coelomic pouches of Pheretima postJinma. 

 N, nerve-cord ; 0, orifices of pouches ; S, iutersegmeutal septum. 



(text-fig. 37). The two halves have come apart— or, perhaps, 

 rather have not joined — and where a single hourglass- shaped sac 

 was to be seen are two smaller sacs of roughly conical form, 

 separated by a considerable space. The fully developed sacs 



