91 



In the lai'va, the Kianeys lie antex'ior to the pos- 

 terior adductor muscle, and lateral to ti^o visceral gan- 

 glion (fifjs. ii,2G). As the viscoral []:an.'3lion passes under 

 and postei-ior to tlie muscle, the kidneys accompany it (fis; 

 7), In the early stages each kidney consists of a simple 

 loop (fic» 7) of vrhich the branch opening to the exterior 

 is the excretory. As the "Ship-v/orm" elongates, the chief 

 secretory portion of the kidney remains v/itli the muscle, 

 v/hile the two ducts become very long, and their openings 

 accompany the visceral ganglion. 



k. The Reproductive Organs. 



The first stage in which I have observed the repro- 

 ductive organs, is in specimens 2 mm. long, in which there 

 is a mass of germ cells under the visceral ganglion (g.o. 

 fig. 7). As growth takes place, processes grow oiit from 

 the original organ, till in the adult, the sexual organs 

 occupy a large part of the posterior part of the visceral 

 mass (figs. 10,31-33.). As the sexual rt'o^'-^cts develop, 



