342 



MEDUS.E OF THE WORLD. 



GENERIC CHARACTERS. 



Olindiadae with tentacles all similar each to each, and all projecting from the sides of the 

 exumbrella above the margin, their entodermal cores traversing the gelatinous substance of 

 the bell and being continuous with the entoderm of the circular vessel. All of the tentacles 

 have pad-like, adhesive disks upon their aboral sides, near their outer ends. No tentacles arise 

 from the bell-margin, but instead there are hollow basal bulbs below the insertions of the 

 tentacles. No centripetal canals. 4 gonads on the 4 radial-canals. Gonads ribbon-like and 

 deflected alternately to one side and the other of the radial-canals. Numerous external lithocysts 

 upon the bell-margin between the tentacles, with entodermal concretions. Mouth with 4 lips. 



Perkins, 1903, has made a partial study of the development, which is probably through 

 a direct metamorphosis of the hydroid into the medusa. (See Gontonemus murbachu.) 



