ete N ABB ILUS. 
VOL. VU. JUNE, 1898. No. 2 
SOME NOTES ON ZONITIDAE. 
BY DR. VY. STERKI. 
1. The generic name Zonites Montf., has, by European malacolo- 
gists, long ago been restricted to a group of circum-Mediterranean 
forms, such as algirus, verticillus, gemonensis, ete., none of them 
being represented in the recent North American fauna; and as it 
seems to be a well-defined genus, we will do well to recognize this 
restriction of the group. The old genus Zonites, or Hyalinia, is 
being disintegrated, just as the old genus Helix has been. For 
nitidus Miller, the genus Zonitoides has been established on charac- 
ters chiefly anatomic, the presence of a dart sac and dart, and, as it 
seems, peculiarities of the radula. As the same dart sac and dart is 
present in a number of North American species, such as e//iotti, 
ligerus, demissus, intertextus, gularis, suppressus, internus, etc., and, 
as has been supposed, and I can positively confirm, arboreus—they 
would range under Zonitoides, especially if their anatomy prove to 
agree with nitida, also otherwise. Dr. v. Ihering makes the propo- 
sition to unite all Vitrino-zonitidae having a dart’ in a family, as 
xiphogone forms—“ Zon.” (or Hyal.) fulvous Mill., gundlachi Pfr., 
sterkii Dall., belong to the genus Conulus Fitz., well characterized 
anatomically. Hy. erystallina Miill., diaphana Studer., etc., of the 
old continent, have their peculiar anatomy also, and range under 
1 Which, however, is not homologous with the dart of the Helicidae, and there- 
fore named fzgio, by v. Ihering. 
