ERRATA. 



Part I pag. 6, line 10 stands: heteromedusoid, read: cryptomedusoid. 

 Part II pag. 2 and following: Lafoeidae, Lafoea, read: Lafaidae, Lafaa. 

 Part II pag. 99, text, line 2 stands: From there is penetrates, read: From 

 there it penetrates. 



