f ' 1 I . / / / 





FIG. 96. 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 ; Bd. 1, 2, buds ; 

 bis. blastostyle ; cee. ccenosarc ; ect. ectoderm ; end. endoderm ; ent. enteric cavity ; g.th. 

 gonotheca ; h.th. hydrotheca ; 1. lithocyst ; m.bd. medusa-bud ; mnb. manubrium ; msgl. 

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

 vl. velum. 



K 2 



