PLATE 25. 



Porpema prunella. 



Fig. 1. A specimen floating in the natural position; seen from above. X 2.5. 



Fig. 2. Lateral view. The tentacles have been partly stripped off to show the conical rorm. X 4. 



Fig. 3. Another specimen, seen from below. X 4. 



Fig. 4. Upper surface of the disc. X 8. 



Fig. 5. The corm, denuded of tentacles and gonozooids. X 7. 



Fig. 6. A tentacle. X 12. 



Fig. 7. Tip of a tentacle, more enlarged. X 18. 



Fig. 8. A gonozooid. X 12. ^ 



Fig. 9. Another gonozooid, contracted. X 12. 



All figures from photographs. 



