44 



MARINE ANIMALS OF MASSACHUSETTS BAY. 



Fi 



Fig. 52. 



The Campanella. (Campanella pachyderma A. Aa.) 



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. 

 Fig. 62. Same, seen from below. 



