THK NAUTILUS. 107 



type of Alaen. I do not see liow their action can be successfully 

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

 tral forms ol Vertigo, and is so retained in Westerlund's last Cdtalog^ 

 No valid grounds exist for shifting the name ; and the advisibility 

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

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

 a Sphyradnim is interesting, and deserves investigation. 



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

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

 stand thus : 



Ptychocheiliis Agassiz, Amer. Journ. Sci. and Arts, XIX, IH.to,, 

 p. 2-27. 



Ptychochilus Jordan, Bull. U. S. Nat. Mus. no. 10, p. 58 (1877). 



Ptychochilus Boettger, Conch. Mittheil., 1881. 



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

 the note by Dall in Nautilus, Feb., 1904, p. IIG. Tiie original 

 species referred by Sterki to Bijiduria were Pupa contracta Say and 

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

 Sterki subsequently (1892) proposed the section ^/^zVm/a, leaving 

 servilis the type of Bijidaria. 



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

 '• Iiordeacea Gabb," by which he meant the form which I call Biji- 

 daria procera cristata. This is demonstrated by his previous article 

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

 the words of his diagnosis of Euhijidaria, "lamellae typical." 



Tlie type of Eubifidaria is therefore P. hordeacea Sterki not Gabb 

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

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

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

 Piipoides. 



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 forth with the single exception of the genus Pupa, 

 which now becomes Pupilla. 



The family name having precedence for the group is Pupiliidse 

 Turton, 1831. 



* Proc. Acad. Nat. Sci. Phila., 1900, pp. G05-G10. 



