ABBREVIATIONS. 



Oriflce of hypophyseal duct. 



Peripharyngeal band. 



Phospliorescent organ. 



Right lobe of stomach. 



Branchial stigmata. 



Duct of subganglionic gland. 



Stolon. 



Bud still attached to stolon. 



Subganglionic gland. 



Test. 



Atrial tentacle. 



Tail. 



Ventral tentacle of branchial circle. 



