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>g q[ ^ Development of Tubularia indivisa : — a, a polypite, attached 



f tpnt- *° ^ e ex ^ rem ^y °f ^ ne ccenosarc, bearing clusters of reproductive 



bodies between the two series of tentacles ; b, one of these clus- 

 6B ' ters consisting of several gonophores, borne on a long branching 



tY from stalk ; c, a single gonophore, containing two young polypites, one 



I of which has commenced to extricate itself; d, the same gono- 

 phore, in a more advanced condition ; e, a young polypite, thirty- 

 six hours after having escaped from the gonophore ; /, the 

 younger polypite, shown within the gonophores c and d ; g, the 

 polypite €, six weeks after extrication, (a is about thrice the 

 natural size : the others are much magnified.) 



Hyd 



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parative powers. When 



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