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J. S. HUXLEY AND G. R. DE BEER 



Second Stage. The hypostome is completely resorbed and 

 the tentacles are represented only by a ring of tiny prominences. 

 The ' waist ' in the body of the zooid has disappeared. The 

 whole is well within the margin of the hydrotheca. The stalk 



Text-fig. 1. 



Diagrams representing : a, normal zooid ; b, first, c, second, d, third, 

 e, fourth,/, fifth stages of resorption remaining in the hydrotheca. 



attaching the zooid to the hydrocaulus is very thin and within 

 it is a mass of cells and debris flowing slowly away from the 

 zooid (Text-figs. 1, c, and 2). 



Third Stage. The zooid has shrunk towards the bottom 



