EXPLANATION 01'' I'LATK XVII. 



Cuidniieuia /lasiceUi, Briggs. 



REFEBENCE LETTEKf 



cc, Circular canal. ///., MouMi. <//•., Ovaiy. r.c, Radial canal. .<., 

 Septum. *•. niii. c, Subuiiibi-ellar cavity. /., Testis, c, Velum. 



Fij^. 1. Mature Medusa viewed from above, with tentacles fully expanded. 



,, 2. Male Medusa ; transverse section passing tbrougli the circular 

 canal (c.c.) ou the I'ight, and below the circular canal ou the 

 left. The section shows the septa (n) se{)arating the testes 

 at a level just below the ladial canals. The cavity of the 

 stomach is shown produced into seven angular embayments 

 forming the stomach diverticula. X 74. 



,, 3. Veitical section passing through the mouth {m.) at tlie free 

 extremity of the manubrium, which is protruded through 

 the aperture of the velum (c). X ^-i. 



,, 4. Female Medusa ; transverse section passing through the ovary 

 (oy;.). a radial canal (r.c), and the circular canal ('•.<•.). 

 X 74. 



