APPENDIX. 



PREOCCUPIED GENERIC NAMES. 



The establishment of the International Commission upon Zoological Nomenclature and 

 the general recognition which the code that controls its decisions has won tor itself among 

 naturalists makes it more than ever desirable that the validity of the generic names we now 

 use should be firmly established. Accordingly, the tenability of each and every generic name 

 adopted in this work has been made the subject of a thorough search, and I am somewhat 

 surprised to find that certain names which have been used for generations without question 

 ot their priority are actually preoccupied for other groups of animals and can not lit- applii-d 

 to medusae. Unfortunately I did not carry out this investigation until after volumes I and II 

 were printed. A list of the generic names which can not be applied in medusae follows: 



Corynitis (page 71, Vol. I)=Linvillea nom. nov. 



Both Corynitis and Corynctcs are preoccupied, the former having been applied to Arach- 

 nids in 1854, and the latter to Coleoptera by Herbst, 1792. Wagner's Plotofnnlc is vaguely 

 described and figured, but it appears to me to be a Protiara, and Browne's TiarifoJon, while 

 it may be a "Corynitis," is too imperfectly known to be determined. We must therefore gi\e 

 to this genus a new name, and I propose Linvilh-a in honor of Dr. Henry R. Liiiulle, win; 

 found the hydroid. The type species is therefore Linvillca agassizii. 



Slabberia (page 73, Vol. I)=Dipurena. 



Slabberia is preoccupied by Oken, 1815 (Lehrbuch der Naturgesch.,Theil 3,Zool., p. 828 ), 

 for Slabber's Medusa marina, which is an Obelta and therefore wholly different from the 

 medusa to which the name Slabberia was applied by Forbes, 1846. We must therefore drop 

 Slabberia in the sense in which I have used it and substitute for it the generic name I)ipur,->xi 

 McCrady, 1857. 



Turris and Tiara = Clavula. 



Both Turris and Tiara are preoccupied and can not be used for medusae. The name 

 Clavula may be applied to these medusae, as has been explained on page 491. Volume II. 



Laodicea (see page 201, Vol. I). 



According to L. Agassiz, 1842-46, Nomenclator Zoologicus, the generic name I.aoJic,-<i 

 was used by Lamouroux, 1816, Hist. Polvpiers Coralligenes, and this statement of Agassiz's 

 is copied in Scudder's Universal Index to Genera in Zoology, 1882, p. 167. Upon refer ring to 

 Lamoroux's work, however, I can not discover that he used the name LaoJitsii. and lulu \c 

 that Agassiz is mistaken, and that Laodicea of Lesson, 1843, mav be retained for medusa?. 

 Laodice is preoccupied, having been used by Gemminger, 1871, for Coleoptera, before Haeckel, 

 1879, applied it to medusae, but this does not interfere with the use of LaoJiiai. Indeed, 

 several medusa genera escape by so narrow a margin; for example, Amaltheii takes precedence 

 over Amalthaea, yet the latter, differing as it does by a single letter, may be used. Similarly 

 Chrysaor takes precedence over Chrysaora, yet both may be used. 



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