44 



MARINE ANIMALS OF MASSACHUSETTS BAY. 



The Campanella. (Campanella pachyderma A. AG.) 



The Campanella (Fig. 51) is a pretty little Jelly-fish, not 



larger than a pin s head, 

 reproduced directly from 

 eggs, without passing 

 through the Hydroid 

 stage. During its early 

 stages of growth it prob 

 ably remains attached to 

 floating animals, thus 

 leading a kind of para 

 sitic existence ; but as 

 its habits are not accu 

 rately known, this cannot 

 be asserted as a constant 

 fact respecting them. 

 The veil in this Jelly 

 fish is very large, form 

 ing pendent pouches 

 hanging from the cir 

 cular canal (see Fig. 

 51), and leaving but 

 just room enough for 

 the passage of the pro 

 boscis between the folds. 

 It may not be amiss to 

 introduce here a general 

 account of this organ, 

 which occurs in many 

 of the Medusae, though 

 it has very different pro 

 portions in the various kinds. It is a delicate membrane, hang 

 ing from the circular tube, so as partially to close the mouth of 

 the bell, leaving a larger or smaller opening for the passage 

 of the water, which is taken in and forced out again by the alter 

 nate expansions and contractions of the bell. 



Fig. 51. Campanella seen in profile ; greatly magnified. 

 Tig. 62. Same, seen from below. 



