32 MUSEUM. BROOKLYN INSTITUTE OF ARTS AXD SCIENCES. 



Fig. 



Fig. 



16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 23. 



23. 

 24. 



25. 

 20. 

 27. 



28. 

 29. 

 30. 

 31. 

 32. 

 33. 

 34. 

 3,5. 



EpcntJiPsift folleata. Kia. 

 Eiicheilota paradoxica. 



PLATE III. 



Side view of inamibriuiii. 



Young medusa. 



Medusa-bud about to be set free. 



Obclia sp. 



" tentacle and otocyst. 

 Tiaropsis punctata. 

 Parvanemus degenrrntus, gen. et 

 sp. nov. 

 Oceania McCradyi. 



Fig. 



Phortis pyramidalis. 



Zygodactyla cyanea. 



Aegina rhodina, 28a. 



Laodicea idothrix. 

 Liriope scutigera. 

 Tetracannota collapsa. 

 Glossocodon tenuirostris. 

 Aglaura hemistoma. 

 Cliidoncma Perkinsii. 



Mature medusa. 



A medusa-bud from one of the liydroid 

 blastostyles. 



Portion of 



PLATE IV. 



Otocyst. 

 Tentacle. 



lell margin. 



Mature medusa. 

 Young medusa. 

 Mature medusa. 



Copied by permission from a drawing by 

 Professor H. F. Perkins, in Jolins Hop- 

 icins University Cireulars, Vol. XXI, N"o. 



42 



Budding stolon of C unoctantha. 

 41. Successive stages in the devel- 

 opment of medusa-buds on 

 the stolon of Cunoctantha 

 shorrn in Fig. 36. 



Marginal sense organ of the 

 medusa of Cunoctantha 

 when about to be set free. 



PLATE 



Cubnia aphrodite. 



OJindia.'! tenuis. 



Young medusa. 



Half-grown medusa. 



Full-grown medusa. 



Manubrium of I^ig. 45. 



Otocyst. 



One of the velfir tentacles. 



One of the sucker-bearing tentacles. 



Young medusa. 



Older than Fig. 50. 



Half-grown medusa. 



