LAOMEDEA. 



65 



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

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

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

 •spring, the reproductive calycles containing the Medusae buds will 



Fig. 83. 



Wit. 81. 



Fig. 82. 



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

 Tima passes through exactly the same process, though the shape 

 ■of the planulse and the appearance of the young differ 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 Medusae 

 passes, fi:om its Hydroid condition to the moment when it enters 

 upon an independent existence as a free Jelly-fish. • 



(^Laomedea amphora Ag.) 



The Medusae of the Campanularians are not aU firee. On the 

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

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

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



Fig. 81. Planula of Melicertum ] magnified. 

 Fig. 82. Cluster of planulse just attached to the ground. 

 Fig. 83. Young Hydrarium developed from planulse ; magnified. 

 9 



