SEA-FLSHE1UES LABURATOlt Y . 



87 



in the basal part of the myzorhynehus. This terminal 

 sphincter muscle lies on and ronnd the opening of the 

 proboscis, and it can evidently be contracted so as entirely 

 to close the os. The figure also shows a series of muscles 

 originating in the base of the myzorhynehus, and inserted 

 into the sides of the proboscis. Evidently these must 

 function as retractors of the latter structure. 



Excretory canals 







/ 



oFthe. proboscf 



Fig. 6, Echeneibothrhim varidbile, van Beneden. Section of the scolex 

 passing through the bothridia. Mag. 40 dia. 



Fig. 6, page 87, represents a section of a scolex 

 belonging to this variety of E. varidbile. The plane is 

 transverse and passes through the posterior part of the 

 scolex, through the pedicels and openings of the bothria. 

 The specimen was preserved in corrosive-sublimate alcohol, 

 and the bothria are very much contracted until the openings 



