20 VITRINIDA. 
Arionta (including Chilotrema and Campylea), Iberus, Tachea, 
Pomatia, Pleurodonta, Thelidomus, Limicolarius, Achatina, 
Borus. 
V. Goniognatha: Jaw composed of several pieces, joined 
together in oblique lines. Pseudostrombus [= Liguus], 
Orthalicus. 
Famity VITRINID A. 
Animal with or without mucous caudal pore, tail often 
obliquely truncate; mantle-margin sometimes more or less pro- 
duced, or reflexed over the sides, or entirely covering the shell, 
which the animal is too large to entirely enter. 
Shell usually thin, corneous, transparent, spiral, of few, rapidly 
enlarging whorls. 
Virrina, Drap., 1801. 
Syn.—Helicolimax, Fer., 1821. Cobresia, Hubner, 1810. 
Limacina, Hartmann, 1821. Parmacellina, Sandberger. 
Distr.—93 sp. , Universal. Mostly inhabit cold or temperate 
countries or mountain regions of warm countries. Fossil. 
Eocene of Europe. 
Shell imperforate, very thin, depressed ; spire short, last whorl 
large; aperture large, lunate or rounded, columellar margin 
slightly inflected, peristome often membranous. 
Animal elongated, too large for complete retraction into the 
shell; tail very short; mantle reflected over the shell-margin, 
and furnished with a posterior lobe on the right side ; without a 
caudal mucous pore. Lingual plate with central tooth tricuspid, 
laterals bicuspid; marginals acuminated, slim, bicuspid. Occa- 
sionally animal-feeders, like the slugs. 
They live in moist situations, among loose earth, stones, grass 
and moss. They are very lively, crawling constantly about, and 
when touched will sometimes jump several inches from the 
ground. 
OLIGOLIMAX, Fischer. Shell small, sculptured, minutely 
perforate. Mantle not much extended beyond the shell in front. 
Animal contractile within the shell. V. annularis, Studer. 
Europe. 
SEMILIMAX, Stabile, 1859. Animal not able to withdraw 
entirely within its shell; shell imperforate. V. diaphana, Drap. 
PHENACOLIMAX, Stabile, 1859. Animal capable of withdrawing 
entirely within its shell, and forming a vitreous epiphragm. J. 
major, Fer. (xcii, 70). Europe. V. fasciata, Soul. (xcii, 71, 72). 
Philippines 
GALLANDIA, Bourguignat. (Trochovitrina, von Martens.) Spire 
conical, last whorl more or less angular, umbilicus perforated. 
Animal wholly retractile within the shell. V. Lederi, Bittger. 
3 sp. Caucasus, Turkestan. 
