Alandonment of the Generic Name Cyclostoma. 347 



The type genus of the Cjclostomidge, or CyclostomatidEe of 

 some authors, now being withdrawn, Pomatiidae is suggested 

 to take its place as the family signification for Pomatias and 

 the allied genera. 



Having recognized the fact that the -iype of Cydostoma^ 

 1799, was applied to Scalaria in 1801 by the same author, it 

 is necessary to do away with the latter genus and apply the 

 name Cyclostoma^ or to adopt Klein's name of Scala, 1753 

 (Ostracologicfe, p. 52), which we find used in 1797 by 

 George Humphrey in his * Museum Calonnianum,' p. 23. 

 This latter method out of the difficulty commends itself to me 

 more favourably than the first, as since Humphrey's day 

 Messrs. H. & A. Adams, in 1853 (Genera Recent MoUusca, 

 vol. i. p. 220), have adopted the same course, and still later 

 this has been followed by Dr. Ferd. Stoliczka in 1868 (" Cre- 

 taceous Gasterop. India," Mem. Geol, Surv. India, p. 230). 

 If this be acted upon, then H. & A. Adams's family name 

 Scalidai would take the place of Scalariidse, hitherto used by 

 most authors. 



In tabular form the genera involved in this discussion will 

 stand thus : — 



Genus Pomatias, B. Studer, 1789. 



TyT^e= Nerita eleyans, Miiller. 

 (^Non Hartinanu, 1021, = Hartmannia.) 



z=Cxjdostoma, Draparnaud, 1801. 

 I 'Non Lamarck, 1799, = Scalaria. I 

 I xVon Lamarck, 1801, = Z>e//j/imit/«. j 



= Cyclostomus, Montfort, 1810. 

 = Cyclostuma, B. Studer, 1820. 



Genus Delphinula, Lamarck, 1803. 



Type = Tttrho dcl2)hhins, Linnaeus. 



= Cyclostoma, Lamarck, 1801. 

 {Non Lamarck, 1799.) 



Genus Hartmannia, R. B. Newton, nom, mut. 

 Type = Cyclostoma patulum, Draparnaud. 



=: Pomatias, Ilartmann, 1821. 

 {Non B. Studer, 1789.) 



