98 



POPULAR ILLUSTRATIONS OF 



.which float at great length in the water, mingling with a large 

 number of marginal tentaculse. The disc " is yellowish or reddish, 

 marked with more or less distinct pale rays, and often spotted with 

 brown at the margin " (Forbes). 



Of the "naked-eyed" Medusae, Forbes has described eighteen 

 genera and figured forty-three species in his beautiful monograph 

 from which I have already quoted. 



Fig. 123. Lucernaria campanulata, as seen from above, and in profile a, mouth of polypitej 

 5, tentacles ; c, hydrorhiza, or root of polypite ; d, the umbrella ; e, seaweed. 



The Lucernaridae are the last group of the Hydrozoa. I propose 

 to restrict them, without going into the question of classification, to 

 those known as constituting the family Lucernariadse, in which there 

 are no ocelli, and which have the umbrella everted and fixed by 

 a hydrorhiza, as shown in Fig. 123. These small but beautiful 



