166 Rathbun Revision of Nomenclature of the Brachyura. 



Mollusca.) Panopea is the name of one of the Nereids. Cancer 

 Panope Herbst, from which the name Panopetis was derived, 

 doubtless referred to the same character. 



Engonionotus* nov., for Cosmonotus Adams and White, 1847. 

 (Cosmonota Dejean, Catal. Col., 3d ed., 1833. I have seen only 

 the reprint of the 3d ed., 1837.) 



Charybdetta, nov., for Cronius Stimpson, 1860. (Cronia H. and 

 A. Adams, Gen., I, 128, 1858, Mollusca.) 



Eaxanthopsis, nov., for Eaxanthas Dana, 1851 = Melissa Strahl, 

 1861. (Euxanthe Hubner, Verz., 39, 1816, Lepidoptera. Melissa 

 Smith, 1854, Cat. Brit. Mus., II. 279, Hymenoptera.) 



Raphonotus^ nov.. for Fabia Dana, 1851. (Fabius Duncan, 

 Foreign Butterflies, 167, 1837, teste Scudder.) 

 .- Leucocarcinus,'l nov., for Leucisca MacLeay, 1838. (Lcaciscas 

 ,Cuvier, Regne Animal, ed. 1, 194, 1817, Pisces.) 

 . Zalasius, nov., for Trichia de Haan, 1841. ( Trichim Fabricius, 

 Sys. Entom., 40, 1775, Coleoptera.) 



Those names which are spelled alike except for their termi 

 nation and have different meanings are not considered the 

 same, e. g., Achseus Leach, 1817, is not displaced by Achasa 

 Hubner, 1816, both being proper names. The same is true of 

 Nemausa A. Milne Edwards, 1875, and Nemausus, Stal, 1865. 



9. Names given simultaneously to different genera. Acanthodes 

 was proposed by de Haan, 1833, for a genus of crabs. The same 

 name was used by Agassiz, July, 1833, for a genus of fishes ; it 

 was, however, substituted for his Acanthoessus, 1832. For this 

 reason, and because it cannot be proved that Acanth odes de Haan 

 is of later date, it seems best to preserve the name for the crus 

 tacean genus. 



Thia Leach, 1815, bears the same date as Thia Oken, Lehr. 

 Naturg., 3 te Theil, l te Abth., a genus of Verrnes. Thia Oken 

 appears in a scheme of classification on p. xiii, and in the index 

 or ' Register ' at the end of the same work (p. xvii), but not in 

 the body of the work^ where it is called Amphinome (teste Faxon). 

 It is impossible to tell which genus, Oken's or Leach's, was first 

 published, but as the former is, I believe, a synonym, and per- 



* Eyywvid?, angular ; vwro?, back. 

 ), suture; vo)ro?, back. 

 ?, white; xa/>x{'v?, crab. 

 , hairy ; , intensive prefix. 



