!>2 THE NAUTILUS. 



ferent stations along the Mexican border, have been carefully com- 

 pared, and the characters noted were found constantly different in 

 both species. The n. sp. has been named in honor of Dr. William 

 H. Dall. 



Bifid, Ashmuni, form minor. 



In company with the two preceding Bitidarhe, Mr. Ashmun 

 found some specimens of Bif. Ashmuni, which are not only smaller 

 than the types, 1.5 to 1.9 mm. high, but the shell is also thinner, 

 the color paler, the everted part of the lip less broad, the number 

 of whorls one-half to one less. 



NOTE ON THE GENERIC NAMES OF TWO GROUPS OF ACHATINID.ZE. 



BY C. F. ANCKY. 



When \vritiug on the terrestrial mollusca collected by Mr. P. 

 Duzen, Dr. Y. Sjostedt, and Dr. J. R. Jungner in the German colony 

 of Cameroon, Mr. Adolf d'Ailly has thought to propose a new gen- 

 eric name for Aehatina Shuttleworthi, Pfr. and Barriana, G. B. 

 Sowerby. The author overlooked the fact that I had some years 

 ago (Bulletins de la Society Malacologiqiie de France, 1888, p. 69), 

 proposed a name for the same group, of which A. Shuttleworthi was 

 made the type. Thus Ganomidos, d'Ailly, becomes a synonym of 

 Callistopepla, Ancey. 



Mr. d'Ailly was not aware that Petitia, Jouss., established for 

 Aehatina pulchella, von Mart, (or rather Petitia Petitia, Jouss., 

 which is a synonym), already being used for another group of 

 shells a section of Stoastoma has been changed by me to Lepto- 

 cala in the same paper (page 70, foot-note 3). Aehatina mollicella, 

 Morelet, probably is the oldest name for the type of the genus, as I 

 believe (and Mr. E. A. Smith, i. 1., agrees with me in that respect) 

 that A. pulchella, v. Mart. (== Petitia Petitia, Jouss., = Aehatina 

 Smithi, G. B. Sow., not Craven == Achat. Sowerbyi, Smith) is a 

 synonym or at least a mere smaller, more solid and conic variety of- 

 the same. I have in my collection a typical specimen of ^4. mollicella, 

 Mor., one of the two original ones collected at the Gaboon by 

 Captain Vignon, and also examples of A. pulchella, von Mart., sent 

 me by the author, and cannot detect any characters of specific value 

 to distinguish them from authentic mol/icelfa, Morelet. 



