THE NAUTILUS. 107 



type of AItK<t. I do not see liow their action can lie successfully 

 opposed. The name Alsea has quite generally been used for dex- 

 tral forms of Vertigo, and is so retained in Westerlund's last Catalog. 

 No valid grounds exist for shifting the name : and the advisibilily 

 of substituting AJcea for Sphyradium, as Prof. Cockerell suggests, 

 need not be considered. His suggestion that P. minutissima may be 

 a Sphyrddium is interesting, and deserves investigation. 



Ptychocltilus Boettger, is preoccupied by Agassiz in Pisces; a fact 

 I neglected to mention at the time I proposed Nesopupa. The names 

 stand thus : 



Ptychocheilns Agassiz, Amer. Journ. Sci. and Arts, XIX, 18.~>5, 

 p. 227. 



Ptychochilus Jordan, Bull.- U. S. Nat. Mus. no. 10, p. 58 (1*77). 



Ptychochilus Boettger, Conch. Mittheil., 1881. 



Bifidaria and Eubifidaria of Sterki call for some notice in view of 

 the note by Dall in NAUTILUS, Feb., 1904 v p. 116. The original 

 species referred by Sterki to Bifidaria were Pupa contracta Say and 

 P. servilis Gld. from certain Mexican Ipcalities. For P. contracta 

 Sterki subsequently (1892) proposed the section Albinula, leaving 

 serrilis the type of Bifidaria. 



In January, 1893, Dr. Sterki proposed Eubifidaria with the lype 

 ' hordeacea Gabb," by which he meant the form which I call Bifi- 

 daria procera crislata. This is demonstrated by his previous article 

 treating of " hordeacea" by his list of the preceding year, and by 

 the words of his diagnosis of Eubifi.daria, "lamellae typical." 



The type of Eubifidaria is therefore P. hordeacea Sterki not Gubb 

 = B. procera cristata P. & V., and the group becomes an absolute 

 synonym of Bifidaria, s. str. The true horducea Gabb, which Dr. 

 Sterki demonstrably did not intend, belongs to a different genus, 

 Pupoides. 



In conclusion I might say that the generic and subgeneric nomen- 

 clature of the United States forms, given in my catalogue of 1900,* 

 stands as there set fprth with the single exception of the genus fvpa, 

 which now becomes Papilla. 



The family name having precedence for the group is Pupillidae 

 Turton, 1831. 



* Proc. Acad. Nat. Sci. Phila., 1900, pp. 605-61-0. 



