APPENDIX, 



PREOCCUPIED GENERIC NAMES. 



The establishment of the Imeinational Commission upon Zoological Nomenclature and 

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

 naturalists makes it more than ever desirable that the validity' ot 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 

 of their priority are actually preoccupied for other groups of animals and can not be applied 

 to medusEe. Unfortunately I did not carry out this investigation until after volumes 1 and II 

 were printed. A list of the generic names which can not be applied lo medusae h)llows: 



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



Both Coiynitis and Corynetes are preoccupied, the former having been applied to Arach- 

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

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

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

 to this genus a new name, and I propose Linvillea in honor of Dr. Henry R. Linville, who 

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



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



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

 for Slabber's MeJiisa marina, which is an Ohelta and therefore wholly different from the 

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

 Slabberia in the sense in which I have used it and substitute for it the generic name Dipureiia 

 McCrady, 1857. 



Turris and Tiara = ClavuIa. 



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

 Clavitla may be applied to these medusK, 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.aodieea 

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

 is copied in'Scudder's Universal Index to Genera in Zoology, 1882, p. 167. Upon referring 10 

 Lamoroux's work, however, I can not discover that he used the name Laodtcea, and believe 

 that Agassiz is mistaken, and that Laodicea of Lesson, 1843, may be retained for medusae. 

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

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

 several medusa genera escape by so narrow a margin; for example, A malt hea i^kes 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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