1(5() JiatJibiiii — Jievlsirm of Nomeaclature of tJi.c BracJiyura. 



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

 Panoiw. Herbst, from which the name Panopeas was derived, 

 doul)tless referred to the same character. 



EngonionotaSj^ nov., for Cosmonotas Adams and Wliite, 1847. 

 {Cosmonota Dejean, Catal. Coh, 3d ed., 1833. I have seen only 

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



Charybdella, nov., for C'ronius Stimpson, 1860. {Cronia H. and 

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



Eaxanthopsis, nov., for Eaxaathus Dana, 1851 ^= Melissa Sir i\.h\, 

 1861. (Ewxanthe }liihnei\Yerz., "id, 1816, Lepidoptera, Melissa 

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



Raphnnotus,^ nov., for Fahia Dana, 1851. (Fa.hius Duncan, 

 Foreign Butterflies, 167, 1837, teste Scudder.) 



Leucocarcinus,X nov., for Leucisca MacLeay, 1838. {Leaciscus 

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



Zalasius,% nov., for Trichiade Haan, 1841. (Tv'ic/mf.s'Fabricius, 

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



Tiiose names which are spelled alike except for their termi- 

 nation and have different meanings are not considered the 

 same, e. </., Achivas Leach, 1817, is not displaced by Achxa 

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

 A^emaiisa A. jMilne Edwards, 1875, and Neiiumsus, Stal, 1865. 



9. Names given simultaneously to different genera. — Acanthodes 

 was })roposed by de Haan, 1833, for a genus of crabs. The same 

 name was used by Agassiz, Jul}'', 1833, for a genus of fishes; it 

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

 reason, and because it cannot 1)6 proved that Acanthodes de Haan 

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

 tacean genus. 



'r/iia. licach, 1815, l)ears tlie same date as Thia Oken, Lehr. 

 Naturg., 3"^ Theil, V Al)th., a genus of Vermes. Thia Oken 

 a[)pears 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 impossiljle to tell which genus, Oken's or- Leach's, was first 

 ])ublished, but as the former is, I believe, a synonym, and })er- 



* Eyyor^u)'^, angular ; vwr^s", back. 



f Pa0rj, suture; vwrr;9, back. 



;{; . I £0X09, white; /.a/r/.{y<i';^ crab. 



§ .birrrof, bairy ; r«, hitensive pretax. 



