Bancroft. — Distaplia occidentalis. 



PLATE 1. 



Fig. 1. Undifferentiated bud. 



Fig. 2. Ovotestis of a young bud, showing ovary and testis separated, and the 



beginnings of a peripheral epithelium about the latter. 

 Fig. 3. Section immediately anterior to Fig. 2. Ovary and testis are united. 

 Fig. 4. Sagittal section of a medium sized bud. Ovary and testis differentiated, 



and both attached to the genital strand. 

 Fig. 5. Cross-section near the posterior end of the abdomen of an adult zooid, 



showing the ovary with its lumen proper, and the lumen of the stalk 



tissue, and a corpus luteum. D, 3; X 530. 

 Fig. 6. Same, from another zooid, showing the ovary. D, 3 ; x 580. 

 Fig. 7. Part of the germinative epithelium of an adult zooid, showing a young 



oogonium projecting into the lumen of the ovary. 



