XXXV111 



INTRODUCTION. 



tentacles and with a merely rudimentary mouth : though 

 the swimming-bell exhibits contractility, it never acts as a 

 locomotive organ, but the zooid continues attached and 

 does not attain a much higher point of development than 

 that of Tubularia. I have observed a similar seasonal 

 arrest of development in Podocoryne proboscidea. In such 



Fig. xv. 



' , " / 



Female capsule of Campanularia flexuosa. a. An ovum, with germinal 

 vesicle and spot, still confined between the walls of the gonophore. b. The 

 spadix, communicating with the general cavity of the cceuosarc. c. An ovum 

 in one of the stages of segmentation, d. A planula. r. The ccenosarc of the 

 zoophyte. 



