X LIST OF THE WOOD-CUTS. 



Fig. 96. Young Medusa of Oceania languida, immediately after escaping from the re- 

 productive calycle 72 



The same, seen from the actinal pole ......... 72 



Somewhat more advanced Medusa .......... 72 



Quarter of the disk of a still more advanced Oceania ..... 72 



Adult Oceania languida, natural size ......... 73 



Magnified view of an ovary .......... 73 



Peculiar attitude sometimes assumed by the IMedusa; ...... 73 



One of the four lips of the actinostome of Ockania gregaria ... 74 



EUCHEILOTA VENTRICULARI8 74 



More magnified view of a quarter of the disk ....... 75 



EuCnEILOTA DU0DECIMALI8 75 



Junction of one of the chymiferous tubes with the circular tube ... 76 



Female Medusa of Eucheilota duodecimalis ........ 76 



Clytia bicophora, immediately after its escape from the reproductive calycle 78 



A somewhat older Medusa 78 



An adult Medusa, measuring a quarter of an inch ...... 78 



Sterile Hydra and reproductive calycle, seen from the broad side .... 79 



Reproductive calycle of Platypyxis cylindric.\, seen from the broad side . 80 



The same, seen from the narrow side ......... 80 



Sterile Hydra of Platypyxis cylindrica. (L. Agassiz.) 80 



A EucopE diaph.\na, seen in profile, just after its escape from the reproductive 



calycle 83 



Quarter of the disk of the same, seen from above 83 



A more advanced Eucope, with the second set of tentacles .... 83 



An adult Eucope, seen in profile 84 



Quarter of Fig. 118, more magnified ......... 84 



Magnified view of the circular tube of a young Eucope 84 



Spermaries of Eucope ........... 84 



Female genital organs 84 



Proboscis of an adult Medusa .......... 85 



Hydrarium of Eucope diaphana, natural size ........ 85 



Magnified view of a sterile Hydra and reproductive calycle .... 85 



Magnified view of part of main stem of Eucope POLYGENA . . . . .87 



Eucope pyrip'ORMis, seen in profile 88 



Quarter-disk of same Medusa ........... 88 



Portion of a Hydrarium of Fig. 127 88 



Quarter-disk of Eucope articulata 89 



Portion of a Hydrarium of Eucope articulata 89 



Hydrarium of Eucope fusiformis 90 



Quarter-disk of the Medusa of Fig. 132 90 



Portion of stem of Hydrarium of OnEH.4 COMMISSURALIS 91 



Quarter-disk of the Medusa of Fig. 1 34 92 



Profile view, natural size, of Riiegmatodes tenuis ...... 95 



Quarter-disk of Fig. 136, seen from the actinal side 9() 



Magnified portion of the circular canal 96 



RuEGMATODES FLORIDANUS, natural sizc. (L. Agassiz.) . . . . 97 



Actinostome of Stomobrachium tentaculatum, magnified .... 98 



Stomobrachium tentaculatum, seen from the abactinal pole, natural size . . 98 



Same as Fig. 141, seen in profile 99 



Portion of the disk of Halopsis ocellata, seen from the abactinal pole, some- 

 what reduced 100 



Cavity from wliich the chjmiiferous tubes radiate . . . . . . 100 



Profile, natural size, of Halopsis ocellata 100 



Magnified part of circular tube . . . . . . . . . . 101 



Magnified view of one of the eyes . • lol 



Young Halopsis ocellata, natural size . ........ U'l 



Young Halopsis ocellata, one fifth of an Inch in height ...... lol 



Magnified portion of circular tube of Fig. 149 UM 



