86 



HYDROZOA. 



fewer in number than those of the upper row {fig. 

 9, a). Vorticlava, also, possesses a twofold series 

 of tentacles, but here, those of the lower circlet are 

 twice as numerous as the upper, which are five in 

 number, short, stout, and capitate {fig. 1 7, 6). In 

 Clava, Cordylophora {fig. 5,c), and GoTyne{fig. 1 7, 



Fig. 17. 



Various forms of Coeyniad^: — a and i, Vorticlava humilis ; 

 c, four polypites of Hydractinia echinata, growing on a piece of 

 shell; d, portion of 8yncoryne Sarsii, with medusiform zooids 

 (p) budding from between the tentacles (t) of the polypite (0). 

 (All, except a, magnified.) 



d\ the tentacles appear irregularly scattered along 

 the sides of each polypite, though most abundantly 

 towards its distal extremity. In Coryne the mouth 

 is highly flexible, possessing the power of bending 

 towards that tentacle which has seized the prey, 

 and of converting itself, upon occasion, into a kind 



