44 



MARINE ANIMALS OF MASSACHUSETTS BAT. 



Tlie Campanella. (Campanelta pachyderma A. Ag.) 



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

 Fig 51 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. 

 61), 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. 



rig. 51. 



Fig. 62. 



Camp&uella seen in profile ; greatly magnified. 

 Same, seen from below 



