DEVELOPMENT OF PLANULA IN A PLUMULARIAN HYDKOID. 89 



the pinnte just as the latter do from the main-stem ; they 

 bear a short basal internode with transverse nodes and no 

 nematopliore. 



Bale^ describes both Plumularia campanula Busk and 



Longitudiual sections of male gonaiiginiu. x 250. 



Plumularia buskii Bale as bearing hydrotheca? on the 

 main-stem ; and AUman- figures a similar condition in 

 Plumularia a r m a t a Alltna n . 



^ Bale, W. M., ' Catalogue of the Australian Hydroid Zoophytes.' 

 1884, pp. 124-5. 



- AUman. G. J.. '"Challenger" Reports." vol. vii, 1883. pi. iv. fig. 4. 



