89 



body is a massive, much poiichod jtructure in v/liich tlie 

 lininf; secretory epithelium i'j vacuolated and in part cil- 

 iated. From the body the very long, narrov/, cylindrical 

 afferent duct passes posteriorly (ka. , figs. 29-31) near 

 the midline. Just in front of the viseral ganrlion it en- 

 larges, becomes convoluted internally, diverges from its 

 fellow of the opposite side (k.a fig. 66) and dips under 

 tlie end of the efferent duct (fig. 65) to open into the 

 posterior angles of the pericardial cavity (fig, 32) by a 

 large funnel-sliaped opening. The lining cells of the af- 

 ferent duct are not vacuolated and apparently not excreto- 

 ry; and, are not ciliated except in the enlarged, funnel- 

 shaped portion in which they bear strikingly long, dense 

 cilia (fig. 64) . 



The efferent duct, loading from the body of the kid- 

 ney to tlie exterior, is also a cylindrical tiibo , of much 

 larger diameter than the efferent duct, It runs with tlie 

 latter near the mid-line (k.e., figs. 10,29-51) and in 

 front of the visceral ganglia , after diverging slightly 

 from its fellow of the opposite side (fig, 66) , it crosses 

 dorsal to the end of the afferent duct. Then it passes to 

 vcntrally and posterially (figs. 65,66) to open near the 



