xu 



LIST OF THE WOOD-CUTS. 



Magnified view of marginal tentacles 



Spherical embryo 



Tlie same, somewhat more advanced ........ 



The same before it becomes attached 



Group of embryos attached, in different stages of development . 



Different stages of growth beyond those of Fig. 213 



Profile of Melicertum georgicum, natural size 



Digestive cavity and point of junction of the chymiferous tubes 



Staurophora laciniata, having eight tentacles 



Quarter of the disk of a young Staurophora, with sixteen large tentacles 



Young Medusa somewhat more advanced than Fig. 216* 



Different stages of actinostome intermediate between that of Figs. 215* and 219 



Young Staurojjhora, having the aspect of the adult ..... 



Profile view of Ptychogena lactea, somewhat reduced 



Magnified view of the genital organs, seen from the abactiual pole 



Same as Fig. 221, seen in profile ...... 



Actinostome ........... 



Magnified base of tentacles and club-shaped appendages . 



Cluster of Dynamena pumila. (L. Agassiz.) .... 



Magnified portion of stem of Fig. 225. (L. Agassiz.) 



Young Nemopsis Baciiei, with four tentacles .... 



Somewhat moi-e advanced Nemopsis 



Magnified view of the sensitive bulb . . . 



Nemopsis in which the genital organs extend a considerable distance along the 

 chymiferous tubes 



Magnified view of the genital organs, the actinostome, and the oral tentacles . 



Magnified j^rofile view of adult Bougainvillia superciliaris . . . . 



Hydromedusarium of BougainviUia ......... 



Young elongated Medusa ........... 



Somewhat more advanced than Fig. 234 



Appearance a short time before separating from the stem ..... 



Same as Fig. 236, expanded .......... 



Young Bougainvillia, immediately after its liberation from the Hydromedusarium 



Magnified view of sensitive bulb ......... 



Tentacular bulb, with young tentacles ........ 



Adult Margelis carolixensis, seen in profile, magnified .... 



Digestive cavity, genital pouches, oral tentacles, and actinostome . . . . 



Sensitive bulb at base of one of the chymiferous tubes 



Young Margelis, having only two marginal tentacles at the base of each chymif- 

 erous tube ............ 



Young Margelis, seen from the abactinal pole, in condition of Fig. 244 . 



Proboscis of a Margelis, having already six tentacles at each sensitive bulb 



Ilydrarium, greatly reduced in size ......... 



Magnified heads and Medusje buds of Margelis carolinensis .... 



Female Medusae buds of Eudendrium dispar, in different stages of development 



Part of a male colony of Eudendrium tenue, magnified .... 



Adult male of Lizzia grata, seen in profile, magnified 



Quarter-disk of a young Lizzia ...... 



Magnified view of sensitive bulb ...... 



Proboscis of male Lizzia, magnified ...... 



One of the four lobes of the actinostome, seen from above . 



Actinal view of proboscis of young Lizzia .... 



Actinal view of proboscis of an older sjjecimen 



Abactinal view of Fig. 257, somewhat less magnified 



Adult Dysmorphosa fulgurans, magnified 



Magnified proboscis, showing young Medusae of the second and third g 



Turris vesicaria, natural size, seen in profile . 



The same, with the bell contracted ...... 



A portion of the disk, seen from the abactinal pole 



enerations 



133 



134 

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 149 

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150 

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 1.54 

 154 

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157 

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