MADE BY DR. ANTONIO RAIMONDI IN PERU. 333 



FHOMOMYA RUGATA, Sby. (sp.). 



Madras id., Sby , Darwin, p. 249, PL 2, f. 8. Tert. ; Pat. 



Mactra CoLCHAGUANA, Hup., Gay, p. 349. Tert.; Chile. 



M. ZoRRiTENSis, Nelson, Tr. Conn. Acad., v. 2, p. 201. Tert.; Peru. 



Standklla Auca, d'Orb. (sp.). 

 jjfacira zd., d'Orb., A. Mer., p. 125, PI. 14, f. 19-20. 



Id. Hup., Gay's Chile, p. 349. Tert.; Chile. 



?Hemimactra Darwinti, Shy. (sp.). 



3Iactra id., Shy., Darwin, p. 249, PI. 2, f. 9. Tert. ; Pat. 



Lutraria plicatella, Lam., A. S. Y., v. 5, p. 410, 



Id. d'Orb., A. Mer., p. 161. Quart. ; Pat. 



R^TA GiBBOSA, Gabb, J. Concli., v. 4, p. 30. 



Id. Gabb, present paper. Tert. ; Peru. 



OsTOMYA PAPYRiA, Con., Proc. Acad. Nat. Sci., Phila., v. 26, p. 30, PI. 1, f. 6. Tert.; Brazil. 



Peron.s!A Petitiana, d'Orb. (sp.). 



Tellina id., d'Orb., Moll. A. Mer., p. 537, PI. 81, f. 26-27. 



TeUinides? oblonga, Sby., Darwin, p. 250, PL 2, f. 12. Tert.; Chile. 



Macoma Htjaffoensis, Con. (sp.). 



Tellina id., Con., Proc. Acad. Nat. ScL, Phila., 1846, p. 20, PL 1, f. 20. Tert. ; Pat. 



Amphidesma BREViROSTRUM, Hup., Gay, p. 361, PL 6, f. 1. . Tert.; Chile. 



Strigilla prora, Hanley (sp.). 



Tellina id., Hanley, Zool. Proc, 1844. 



Strigilla id., Gabb, J. Conch., 1869, p. 30. Tert. ; Peru. 



Mesodesma donacina, Rve., Conch., PL 45, f. 1. 



■Donacilla Chilensis, d'Orb., Moll. A. Mer., p. 530. Quart. ; Chile. 



Venus Baylii, Hup., Gay, p. 340. Tert. ; Chile. 



?Y. Chilensis, d'Orb., A. Mer., p. 124, PL 13, f. 12-13. 



Lucina id., d'Orb., on plate. 



V. id., Hup., Gay's Chile, p. 342. Tert. ; Chile. 



?Y. Cleryana, d'Orb., A. Mer., p. 123, PL 13, f. Y-8, 



Id. Hup., Gay, p. 341. Tert. ; Chile. 



?Y. Coquandi, Hup., Gay, p. 340. Tert.; Chile. 



Y. Dombei, Lam., A. S. Y., v. 5, p. 590. 



brushes aside both generic and specific name, saying, in the fofnlef case, "the objecticin to Pacliydon is too 

 obvious to need any further delay in condemning it." Mr. Conrad's objection is that its derivation is the same 

 as Pachyodon {='>.Paxyodon Schum.) "Woodward's objection to the specific name— -iereuis— is that his speci- 

 mens were not thin ; mine were ; and there is no rule of nomenclature that authorizes one writer to change a 

 name once given to a species, by another, Unless it is pre-occupied. As to the name Pachydon, there are 

 numerous precedents for the elision of an uneuphonic letter in generic names ; and if, at the worst, the word 

 should have no meaning ; if it is a "nonsense name," there are not Wanting precedents — and eminent ones. 

 Mr. Woodward would not presume to amend Adanson and others 1 The etymology of Pachydon is presumed 

 to be the same as that of Schumacher's Paxyodon, but there can be no possible chance of confusion between 

 the two words, either for the eye or ear. I was not ignorant of the existence of this name when I proposed 

 my own ; nor yet of Stutchbury's Pachyodon, which is synonymous with Thalassides of Berger. 

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