142 CAMPANULARIED^E. 



it better not to apply the one which immediately suggests 

 to the mind this false distinction, and has become identi- 

 fied with the branching forms, to genera composed 

 either wholly or in part of simple species. I have 

 therefore retained Clytia, which was assigned by its 

 author to such species, for the first section, and Cam- 

 panularia for the third*. 



Besides the groups just referred to, Lamarck's Cam- 

 panularia would embrace within its ample bounds the 

 Gonothyraa of Allman, while in C. syringa it includes 

 the type of yet another genus. 



The present genus affords a striking illustration of the 

 changes which the sexual zooid may pass through as it 

 advances towards maturity. According to the observa- 

 tions of A. Agassizf, that of C. bicophora (which seems to 

 be our C. Johnstoni with an American title) loses after a 

 time its globular outline, and 

 assumes the appearance repre- 

 sented in the accompanying 

 figure (woodcut, fig. 15). The 

 lower portion of the bell bulges 

 out, the tentacles are doubled 

 in number, and the rudiments 

 of eight more are traceable on the margin. The ovaries 

 have also increased in size. 



In its adult stage the zooid is hemispherical in form, 

 and measures a quarter of an inch in diameter ; it is fur- 



* Allman has apportioned these names somewhat differently. He has dis- 

 carded Clytia on the ground that it has been less generally used by authors, 

 and gives Laomedea to the third group. To me, I confess, a less familiar 

 name seems preferable to one with which inconvenient associations are con- 

 nected ; and it must not be forgotten that Clytia finds a place in the two 

 latest works of any magnitude on the Hydroida, those of Agassiz and Van 

 Beneden. 



t North American Acalepha 5 , p. 78, figs. 108-110. 



