92 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 Bifidarix, Mr. Ashmun 
found some specimens of Bij. Ashmuni, which are uot 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#. 
BY .C. BF. ANCEY. 
When writing on the terrestrial mollusca collected by Mr. P. 
Duzen, Dr. Y.Sjéstedt, 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 Achatina Shuttleworthi, Pfr. and Barriana, G. B. 
Sowerby. ‘The author overlooked the fact that I had some years 
ago (Bulletins de la Society Malacologique 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 
Achatina 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). Achatina mollicella, 
Morelet, probably is the oldest name for the type of the genus, as I 
believe (and Mr. E. A. Smith, i. |., agrees with me in that respect) 
that A. pulehella, v. Mart. (= Petitia Petitia, Jouss., = Achatina 
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 A. 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 mollicel/a, Morelet. 
. 
eer 
