ANALYTICAL INDEX. 



317 



( ' H AFTER XL— continued. 



History of Medusae obscure, 



Metamorphosis of marine products, 



Medusae not surviving above 60 days, 



Perfect animals breed, . 



Hydra tuba breeds, 



Colony having produced Medusae, 



New hydrae from the parent of the colony, 



No second brood of medusae from a hydra, 



Medusan roll, 



Plate L. explained, 



II. Medusa, 



§ 1. Medusa aurita, 

 Described, 

 Plate LI. figs. 1-4 explained, 



page 241 

 242 

 ib. 

 243 

 ib. 

 ib. 

 244 

 ib. 

 245 

 ib. 



246 



ib. 

 ib. 



247 



§ 2. Medusa capillata, 

 Described, 

 Planulae, 

 Plate LI. figs. 5, 6, 



247 

 ib. 

 ib. 



248 



§ 3. Medusa crinita, 

 Described, 

 Plate LII. figs. 1, 2, 



ib. 

 ib. 

 ib. 



§ 4. Medusa proboscidea, 

 Described, 



Are there two species ? 

 Plates LII. figs. 3, 4 ; LIII. figs. 2, 3, 



ib. 



ib. 

 249 

 250 



§ 5. Medusa (tima), 

 Described, 

 Plate LII. fig. 5, 



ib. 



ib. 



251 



§ 6. Medusa fimbriata, 

 Described, 



A microscopic animal, 

 Plate LII., figs. 6, 7, 



III. Beroe, 



§. 1. Beroe ovatus, 



ib. 

 ib. 

 ib. 

 ib. 



252 

 ib. 



