£._l.p_b._c. Fold to form left peribranchial cavity. 



£.r.pb._c. Fold to form right peribranchial cavity. 



g._c. Gienital cord. 



gl . Ganglion. 



g. _s. Crill-slit. 



int. Intestine. 



l.a.ex. Left anterior extension or pouch of peribranchial 

 cavi ty . 



1. d. t. Lumen of dorsal tube. 



l.pbr.c. Left peribranchial cavity. 



l.p.ex. Left posterior extension or pouch (left epicardial 

 sac?) of peribranchial cavity. 



oe . Oesophagus. 



0. r. "Organe refringent." 



pc. Pericardium. 



pt. Double-v/alled partition of stolon. 



r.a.ex. Right anterior extension or pouch of peribranchial 

 cavi ty . 



r . pbr . c . Right peribranchial cavity. 



r.p.ex. Right posterior extension or pouch (right epicar- 

 dial sac?) of peribranchial cavity. 



r.v/.i.v. Thickened wall of inner vesicle on right side. 



rd.d.t. Rudiment of dorsal tube. 



rd.g. Rudiment of sexual organs. 



r d . gl . Rudiment of ganglion. 



rd . pc . Rudiment of pericardium. 



'1- 



