FIG. 83. Obelia sp. A, portion of a colony with certain parts shown in longitudinal section : 

 B, medusa ; C, the same with reversed umbrella ; D, the same, oral aspect ; BiL 1, 2, buds ; 

 bis. blastostyle ; cce. coenosarc ; cct. ectoderm ; end. endoderm ; ait. enteric cavity ; g.th. 

 gonotheca; h.th. hydrotheca ; I, lithocyst; m.bd. medusa-Jmd; mnb, manubrium ; mjfjl. 

 mesogloea; mth. mouth; p. perisarc ; P. 1, 2. 3, polypes; rod. c. radial canal; t. teuTncie; 

 vl. velum. 



