Bancroft. — Distaplia occidentalia. 



PLATE 2. 



Fig. 8. Whole preparation of a young incubatory pouch, about \ adult size. 



A, 2; X 91. 

 Figs. 9, 10. Cross-sections of the posterior end of the thorax of a zouid that had 

 nearly reached maturity, showing the region where the stalk of the 

 incubatory pouch joins the zouid. Fig. 10 is the more anterior sec- 

 tion. D, 2 ; X 380. 

 Fig. 11. From another zooid of the same age as that figured in Figs. 9, 10, show- 

 ing the opening of the pouch into the peribranchial sac. D, 2; X 380. 

 Fig. 12. Cross-section of the ovary and testis of a young Styela montereyensis. 

 Powell and Leland -^^ immers. ; X 850. 



