Aiidfoiii 1/ iif A a^t ml III II A III fill ilnii . 249 



succeedinpr the one drawn =t ljL'in<; situated in :i main branch 

 of the Renal Vein (R.V.). The amount of sup]) itive connec- 

 tiv© tissue present in tliis f rm slmuld Ito noted as cliaracteristic 

 of one type of kidi'.ey. x I'OO. 



FiouKi', 4. 



Snnill portion of ventral edt^e of a transverse vertical section 

 across the kidney of Heleioporus pictus. In contrast to Figure 

 3, there is to be noted here, the remarkable development of 

 blood-spaces (b. sp.) — often without walls of their own — at the 

 expense of the supportive connective tissue. The length of the 

 nephrostomes is well seen, as also the internal opening (i.o.n.) 

 with the cilia protruding among the blood corpuscles in the 

 blood->pace. For the sake of clearness, the blood corpuscles 

 have been represented as much fewer than they really are, the 

 whole space being ci'ammed full of tlicni in this form. x 'JOG. 



FuiUHK 5. 



Section similar to that in Figure 4. though much anterior to 

 it, and less magnified, showing the gland (?) (gl.), and the con- 

 nection of a Vas eft'erens w^ith the ampulla (a), on Bidder's 

 longitudinal canal, and especially the opening of a branch from 

 the ampulla directly into the Malpighian capsule, where the 

 mass of sperm has pushed the glomerulu;? (g.) quite to one side. 

 The presence of sperm in the uriniferous tubules is also shown. 

 xfiO. 



