138 Excretory Organs in Bdellostoma Stouti 



The presence of the excretory organs in segments where later the gill 

 slits were found, was formerly thought to constitute a resemblance 

 between the excretory system of Bdellostoma and that of An^phioxus, in 

 which the position of the excretory system and branchial system coincide, 

 but this opinion is no longer held. 



