8 Cockerell — The Nomenclature of the Scyphomedusse. 



in one instance he deleted a change which 1 had (as I now 

 recognize) mistakenly proposed. 



The two exceptions concerned the genera Phyllorhiza and 

 Thysanostoma of L. Agassi/,, for which it seemed extremely 

 desirable to take as types well-known and recognizable species, 

 instead of the almost hypothetical forms on which these generic 

 names were based. Unfortunately it is quite impossible under 

 the rules to take as the type of a genus n species not originally 

 included, or even (as in these cases) published at the time 

 when the generic name was first proposed. In the case of 

 Thysanostoma the imperfectly known type species may well 

 represent the genus as defined by Mayer, so there is no disturb- 

 ance of the nomenclature; but the original Phyllorhiza was 

 probably Cephea, and there seems no way of avoiding a new 

 name for Phyllorhiza in the sense of von Lendenfeld and Mayer. 



It is proposed later to treat the Hydromedusse in the same 

 manner, though there are some exceptional difficulties in the 

 way of this undertaking. 



Names within square brackets are those of Dr. Mayer's work. 



Order CARYBDEIDA [Carybdei.be]. 

 Fa m . Car ybdei d.e . 



Carybdea Per. & Less. 



marsupialis ( L. ) . 

 Tamoya F. Mull. 



haplonerria F. Mull. 

 Tripedalia ( lonant. 



cystophora Conant. 

 ( 'hyropsalmus L. Ag. 



quadrumanus (F. Mull.). 

 Chirodropus Haeck . 



gorilla Haeck . 



Order STAUROMEDUSIDA [Stauromedusse]. 

 Fam. Luceenakiid^e. 



Subf. Tesseranthin.h. 

 Tesseranthe Haeck. 

 connecteus Haeck. 



Subf. LUCERNARIIN;E. 



Depastrum Gosse. 



cyathiforme (M. Sars). 



