ERRATA. 



Part I pag. 6, line lo stands: heteroinedusoid, read: cryptomedusoid. 

 Part II pag. 2 and following: Lafoeidae, Lafoe'a, read: Lafcsidae, Lafiia. 

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

 there it penetrates. 



