Danforth. — New Pteropod. 
PLATE 4. 
Fig. 11. Longitudinal section showing developing sperm in the gonad. 
Fig. 12. Diagrams of the hermaphroditic duct, receptaculum seminis, and 
accessory glands; the dotted outline shows the vagina as dis- 
tended. 
Fig. 13. Diagram of penis sack and penial accessoiy glands. 
Fig. 14. Horizontal section through head showing penis and first and 
second penial glands. 
