50 MARINE ANIMALS OF MASSACHUSETTS BAY. 



from which most of our Jelly-fishes are developed. They differ 

 in one essential feature from the Tubularians. (Fig. 93.) The 

 whole stem, from summit to base, is enveloped in a horny sheath, 

 extending around both the fertile and sterile individuals of the 

 community, and forming a network at the base of the stem, 

 which serves as a kind of foundation for the whole stock. To 

 the naked eye such a community looks like a tiny shrub (see 

 Fig. 57), with the branches growing in regular alternation on 

 either side of the stems. The reproductive calycles, i.e. the pro 

 tecting envelopes covering the young Medusae, usually arise in 

 the angles of the branches formed by a prolongation of the 

 sheath. These calycles or bells, as they are called, assume a 

 great variety of shapes, elliptical, round, pear-shaped, or ringed 

 like the Clytia. (Fig. 72.) In one such bell there may be no 

 less than twenty or thirty Medusae developed one below the 

 other ; when ready to hatch, the calycle bursts and allows them 

 to escape. 



Eucope. (Eucope diapliana AG.) 



In Figs. 60 and 61 we have a representation of our little 

 Eucope, one of the prettiest of the Jelly-fishes belonging to this 



Fig. 57. Fig. 58. 



group ; Fig. 57 represents the Hydroid from which it arises ; a 

 single branch with the reproductive bell being magnified in Fig. 



Fig. 57. Hyrtrarium of Eucope ; natural size 

 Fig. 58. Portion of Fig. 57 ; magnified. 



