296 W. BLAXLAND BENHAM. 



Fig. 1. — A nephridium treated with nitrate of silver^ to 

 show the pavement coelomic epithelium covering the vesicular 

 tissue, and forming in parts a suspensory fenestrated mem- 

 brane, which carries blood-vessels. E. First loop. F F. 

 Second loop. G G. Third loop. N. Nerve-cord. S. Septum. 

 SN. Subneural blood-vessel. V. Subintestinal blood-vessel, 

 a. Somatic branch from subintestinal blood-vessel, d. Ventral 

 part of commissural vessel, h, h, h. Suspensory membranes, 

 carrying and covering the nephridial blood-vessels, i. The 

 group of coelomic epithelial cells around the prseseptal region 

 of the narrow tube. 



