|)OI,IOI.II)AK \sK\l\L RKI'KOIHH TION. 



475 



ventral process (.*/) near the posterior end of the body ; this process 

 is derived from the peduncle connecting the median hud with the 



enr 



Fig. 245.- The three generations of Doliolum Millleri (after G-ROBBEN). .1. young 

 "nurse" <<v blastozooid; II. the phorozooid; C, sexually mature individual or 

 gonozooid. d, alimentary canal; ds, dorsal outgrowth ot tin- "nurse" form; es 

 t-m lost \ If ; if. peripharyngeal band; g, buds of the sexual generation; h, testis 

 lis, integumental sensory organ; ks, gill-clefts; n. ganglion; ot, auditory organ 

 nv, ovary ; /<. pericardial vesicle and heart : st, peduncle tor the attachment of the 

 gonozooids (g) to the phorozooid : vs, ventral stolon of tin- •'nurse" form (-o-e.-illeil 

 rosette-like oi-l:;hi I. 



