proposed rejection of C yclostoma. 523 



(1) Pomatias, B. Studer, 1789 ( = Nerita elegans, Miiller). 



(2) Scala (Klein, 1753), G. Humphrey, 1797 {=Turbo 



scalaris, Linn.). 



(3) Cyclostoma, Lamarck, 1799 (= Turbo scalaris, Linn.). 



(4) Cyclostoma, Draparnaud, 1801 ( = Nerita elegans, 



Miiller). 



(5) Cyclostoma, Lamarck, 1801 {=Turbo delphinus, Linn.). 



(6) Scalaria, Lamarck, 1801 (= Turbo scalaris, Linn.). 



(7) Delphinula, Lamarck, 1801 ( = Turbo delphinus, 



Linn.). 



(8) Pomatias, Hartmann, 1821 (= Cyclostoma patulum, 



Drap.). 



Every naturalist on viewing this list of eight genera 

 and their types would readily admit the very urgent import- 

 ance for their final revision. Beginning with Studer's 

 Pomatias of 1789, we find that its type was transferred by 

 Draparnaud to his Cyclostoma of 1801. There is, then, no 

 alternative, in the exercise of the just law of priority, but to 

 accept this Studerian name to the exclusion of the other. 

 The next genus, Scala, truly a Kleinian name, and conse- 

 quently pre-Linnean, but which was used by G. Humphrey 

 in 1797, just two years before the establishment of Lamarck's 

 first Cyclostoma, is recommended for adoption not only on 

 the ground of priority, but as being a means of escaping 

 from the difficulties connected with the genera Scalaria and 

 Cyclostoma, the types of which are identical with that of 

 Scala. 



Prof. W. H. Dall, of Washington, has just favoured me 

 with a reference to his valuable report on the ' Blake ' Mol- 

 lusca *, in which, after a full discussion on every aspect of 

 this question, he had no hesitation in deciding in favour of 

 the retention of Scala. It is to be hoped that before long we 

 shall hear that M. de Boury, the chief authority on the 

 Scalidse, will see the necessity for adopting the same, more 

 especially as he employs the family name of Scalidas for his 

 group, and not Scalariidae. 



Lamarck cancelled one of the mistakes of his previous 

 work when, in 1804, he established his genus Delphinula 



* " Report on the Mollusca dredged by the U. S. Coast-Survey Steamer 

 'Blake,' " Gasteropoda and Scaphopoda, Bull. Mus. Comp. Zool. Harvard 

 Coll. 1889, vol. xviii. p. 299. 



