LIST OF THE WOOD-CUTS. 



Xlll 



^Magnifiel profile view of genital organs and actinostome 



Magnified view of a part of a chyniiferous tube 



Base of one of the eliymiferous tubes, and part of the circular tube 



One of the tentacles, in a profile view ..... 



One of the tentacles, seen from the abactlnal pole 



Young TruuiToi'sis nutuicula, with four marginal tentacles 



Somewhat more advanced, having sixteen tentacles 



Stomotoca atka, somewhat magnified, seen in profile . 



Magnified view of genital organs ....... 



Stomotoca atra 



Clava leptostyla. (L. Agassiz.) 



Young WiLLiA OKNATA, having only the second set of tentacles developed . 

 Young Willia, nearly in the stage of Fig. 276, seen from the abactinal pole . 

 Profile view of a young Willia .......... 



Part of the circular tube 



View of ovary of Fig. 276 ......... . 



Same as Fig. 278, seen from the abactinal pole 



Proboscidactyla flavicirrata 



Actinostome and digestive cavity ......... 



Portion of ilisk to show mode of l)ranching of chyniiferous tubes, and tubes con 



taining lasso-cells, as in Willia ........ 



Adult CoRYXK MiUABiLis, seen in profile. (L. Agassiz.) .... 



Coryne, with proboscis contracted. (L. Agassiz.) ..... 



Coryne, with expanded proboscis. (L. Agassiz.) ...... 



Cluster of Hydraria of Cor^Tie mirabilis. (L. Agassiz.) .... 



Young Hydrarium of Coryne. (L. Agassiz.) ....... 



^lagnified view of head, with IMedusfe buds attached. (L. Agassiz.) . 



CoRYXE kosakia, natural size 



Ilydromedusarium of Syndictyon reticulatum, greatly magnified . 

 Syndictyon reticulatum, iimuediately after it has become freed from the Hydro 



medusarium, in profile ..... 

 One of the tentacles of Fig. 291, magnified . 



Sensitive bulb of Fig. 291 



Digestive cavity of Fig. 291 



Fig. 291, from actlnal pole ...... 



Fig. 291, from abactinal pole ..... 



Part of net-work of lasso-cells of surface of spherosome 

 Adult Medusa in a natural attitude ..... 



Same Medusa (Fig. 298) with the tentacles contracted 

 Actinostome of adult Medusa ...... 



Young DiPUREXA coxica 



Digestive cavity of a young Dipurena conica . 



Tentacle of Dipurena conica ..... 



Digestive cavity of a Medusa in which the constriction has already separated the 



upper and lower halves ..... 



Adult Dipurena conica, in which the two digestive cavities are widely separated 

 Profile view of half a young Gemmaria gemmosa . 

 Profile view of Gemmaria cladopiiora, magnified 

 Quarter-disk of same, seen from the abactinal pole 

 Actinostome of Gemmaria, enlarged .... 



Cluster of lasso-cells of the marginal tentacles 



Fertile Hydra of Pexxaria tiarella .... 



Medusa distended by eggs ...... 



Profile view of Medusa of Pennaria tiarella 



DifTerent attitude of the Medusa, seen from the aetinal pole 



Fig. 313, seen from the abactinal pole .... 



EuPHYSA viRGUL.ATA, Seen in profile .... 



]\Iagnified proboscis of Fig. 31 G 



Aetinal view of Euphysa virgulata .... 



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