LAOMEDEA. 



65 



end, short and stunted at first, but tapering rapidly out into fine 

 flexible feelers, the stem branches, and we have a little Hjdroid 

 community (Fig. 83), upon which, in the course of the following 

 spring, the reproductive calycles containing the Medusae buds will 



Fit:. 83. 



Fijr. 81. 



FiR. 82. 



be developed, as in the case of the Eucope and Clytia. The 

 Tima passes through exactly the same process, though the shape 

 of the planulae and the appearance of the young difier from that 

 of the Melicertum, as may be seen in Fig. 78, where a single 

 head of the Tima Hydroid, greatly magnified, is represented. 

 By combining the above observations upon the development of 

 the Hydroids of the Melicertum and Tima with those previously 

 mentioned upon the young Medusa arising from reproductive 

 calycles in the Eucope and Clytia, we get a complete picture of 

 all the changes through which any one of these Hydroid Medusa3 

 passes, from its Hydroid condition to the moment when it enters 

 upon an independent existence as a free Jelly-fish. 



(Laomedea amphora Ac) 



The Medusae of the Campanularians are not all free. On the 

 •contrary, in many of the species they always remain attached to 

 the Hydroid, never attaining so high a development as the free 

 Medusae, and withering on the stem after having laid their eggs. 



Fig. 81. Planula of Melicertum ; magnified. 

 Fig. 82. Cluster of i)la.nulaj just attached to the ground. 

 Fig. 83. Young llydrarium developed from planula) ; magnified. 

 9 



