FAMILY 2. COLIMACEA. 65 
distribution of this immense series ; and we can adopt it, with a few ad- 
ditions and alterations, without following Desbayes in contracting the 
nomenclature, or Gray in overcharging it. 
A laudable attempt has been made by De Férussac to effect an im- 
provement in the arrangement of the Colimacea, which it may be as well 
to notice, both on account of its novelty and its comparative usefulness ; 
and it would have been more generally followed than it is, were it not 
for the innovation which he hazarded, by the abandonment of all the 
names hitherto recognized, in exchange for a newly invented series of 
his own. The Colimacea, and a portion of the Limacinea, are in this ar- 
rangement included in one family, under the title of ‘‘ Les Limacons ;” 
they are then divided into five genera, Helicarion, Helicolimax, Helix, 
Vertigo, and Partula; and the genus Helix, which includes nearly the 
whole of them, is distributed in the manner displayed in the following 
table; the subgenera corresponding to a certain extent with the genera 
recognized by Lamarck. 
Genus. Sections. Subsections. Subgenera. Synonymous with 
HELICOIDES. . . Helicophanta. . Helix pars. 
(Whorls rolled 
REDUNDANTES. longitudinally.) 
(Animal partially 
enclosed.) COCHLOIDES . . .Cochlohydra . . Swecinea. 
(Whorls rolled 
L vertically.) 
Helicogena . . . Helix pars. 
HELIX . are I 
HELICOIDES. .| Helicodonta . . Anostoma. 
(Whorls rolled Helicigona . . . Carocolla. 
DUES ERTE TS) Helicella . . . . Helix pars. 
INCLUSE Helicostyla . . . Helix pars. 
(Animal entirely Cochlostyla . . . Bulimus pars. 
enclosed.) : . 
Cochlitoma . . . Achatina pars. 
COCHLOIDES. . | Cochlicopa . . . Achatina pars. 
(Whorls rolled Cochlicella . . . Bulimus pars. 
vercically:) Cochlogena. . . Bulimus pars. 
Cochlodonta . . Pupa. 
Cochlodina . . . Clausila. 
VOL. II. K 
