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EXPLANATION OF PLATES. 



Reference letters used on plates and text figures . 

 1 -8= nerves. 

 «.=anus. 

 6.= bud. 



b. o.=blood-forming organ. 

 br. 6.= branchial bars. 



br. c.=branchial chamber. 

 6r. c / .=prebranchial chamber. 



c. a.=colonial aperture. 

 c./.= cilia ted funnel. 

 cl.= cloaca. 



cl. cr.=cloacal aperture. 

 cl. m.=cloacal muscle. 

 cl. tn.=cloacal tentacle. 



c. m.=circum.-oral muscle. 

 a\=diaphragm. 



d. a. s.=dorsal anterior blood sinus. 

 d. l.=dorsa\ languet.* 



d. I. s.=dorso-lateral blood sinus. 

 d. p. s.=dorsal posterior blood siitus. 

 d. s.=dorsal blood sinus. 

 a7.=duct of neural gland. 

 c.=endostyle. 



