32 MUSEUM, BEOOKLYN INSTITUTE OF AETS AND SCIENCES. 



PLATE III. 



Fig. 



" 35. Phortis pyramidalis. 



" 26. Zygodactyla cyanea. 



Fig. 28. Aegina rhodina, 28a. 

 29. 



30. Laodicea ulothrix. 



31. Liriope scutigera. 



32. Tetracannota collapsa. 



33. Glossocodon tenuirostris. 



34. Aglaura hemistoma. 



35. Cladonema Perkinsii. 



blastostyles. 



Portion of bell margin. 



PLATE IV. 

 Otocyst. 

 Tentacle. 



36 

 37 



42. 



Mature medusa. 

 Young' medusa. 

 Mature medusa. 



Copied by permission from a drawing by 

 Professor H. P. Perkins, in Johns Hop- 

 kins University Circulars, Vol. XXI, No. 

 155. 

 Budding stolon of Cunoctantha. 

 •41. Successive stages in the devel- 

 opment of medusa-duds on 

 the stolon of Cunoctantha 

 shown in Pig. 36. 

 Marginal sense organ of the 

 medusa of Cunoctantha 

 when about to be set free. 



PLATE V. 



Cubaia aphrodite. Young medusa. 



" " Half-grown medusa. 



" Full-grown medusa. 



" Manubrium of Fig. 45. 



Otocyst. 



One of the velar tentacles. 

 One of the suckers-bearing tentacles. 

 Olindias tenuis. _ Young medusa. 



. .; Older than Fig. 50. 

 Half-grown medusa. 



