COELENTERATES IN GENERAL 



145 



A B 



Fig. 60. — Two scyphozoan jellyfishes. A, Rhizostoma puimo Ilaeckel. B, Chrysaora 

 hyoscella. (From Lankester, "^ Treatise on Zoology," by the courtesy of A. and C. Black.) 

 The first of these reaches such a size that the bell is 2 feet in diameter; in the second the 

 bell may be 6 inches across. 



Sfotrroc/eum fecro/insf 



info enferon i/^ c<bout fr?oufh 



Teniae Jes 



aconi/um 



Primary mesentery 

 Reproc/ucfi've or<^an 

 Ed^e of mesentery 



Fig. 61. — A sea anemone, Metridium dianthus Ellis. (From Woodruff, "Animal 

 Biology," by the courtesy of The Macmillan Company.) A, view of polyp with one (juadrant 

 removed. B, diagram of transverse section, reduced in size, showing the general plan of 

 the mesenteries. 



