ECHIUROID FAUNA OF NORTH PACIFIC — FISHER 497 



position the portion of the dorsal blood vessel, B\ attached to esophagus is 

 nearly middorsal. The nerve cord is shovra without the close serpentine 

 twisting due to contraction of body wall. {Go, ovary.) 



2. Nephridia of type, the proximal portion, due to contraction of body wall, 

 overlapped by the seta apparatus, X 4. 



2a. Ventral aspect of cloacal complex of type, X 3. The cloaca has been turned 

 backward owing to the attachment of dorsal wall of cloaca to body wall. 

 The anterior end of cloaca is below ; the circle indicates passage into intestine 

 which was torn off. AV is the anterior lobe of anal vesicle and the numerous 

 villiform nephric tubules normally hang from the underside of the vesicle. 

 Position of anus at A. 



(Lettering as for plates 28 and 29.) 



U. S. GOVERNMENT PRINTIHS OFFICE: 1949 



