FISHERY BULLETIN: VOL. 74, NO. 4 



E 



o 

 o 



actinoph 

 epith 



500/um 



Figure 9.—Stephanauge( ?) spongicola. A. Section through part of the actinopharynx. B. Cross section of a retractor of one 

 of the protomesenteries. C. Cross section of the peripheral part of a perfect mesentery (the section is from the distal part 

 of the column). D. Section through a part of the body wall. E. Section through a mesenterj' of the last cycle, actinoph 

 epith— epithelium of actinopharynx, ect— ectoderm, eincl— ectodermal invagination forming an imperforate cinclis, 

 ent-entoderm, mgl-mesogloea, pbm-parietobasilar muscle, retr ent-entoderm of retractor muscle. 



876 



