Notes on the Adult Anatomy of Solaster endeca 189 



Fig. 8. 



Vertical section in mid-interradial line of part of large Solaster endeca, to illustrate course 

 and relations of the interbrachial branch of the external oral perihsemal ring. 



ext. s. 

 h. 

 hy. r. 



i. br. 



int. s. 

 n. r. 

 ps. 

 p. v. 

 s. m. 

 st. 



external oral perihsemal sinus. 



the oral hremal ring. 



circular ring of the hydroccele in cross section giving off the stalk of the 



Polian vesicle, and also here represented as giving off a branch to one ol 



the Tiedemann's bodies (see p. 190). 

 interbrachial branch of ext. or. perih. sinus, breaking up at s.m. into fine 



terminal divisions, 

 internal oral perihtemal sinus, 

 circular nerve ring, 

 peristome. 

 Polian vesicle. 



terminal divisions of the interbrachial branch of the ext. or. perih. sinus, 

 stalk of Polian vesicle. 



