IMRODUCTIO. 
XI 
Iractala suat, quarum utraquo genera comprehendit nuda et testa 
praedita. In familia Arionidanmi genera sunt sequentia: a, Arion, 
Phosphorax, 6. llelicarion, c. Nanina, Stenopus, d. Zonites — 
in familia /fe&zdarum haec: n. Limacellus, Scutelligera (e classe 
Molluscorum jamdiu eliminata), Mehimatium (Meghiraatium van 
Ilass., Fer.), h. Limax, c. Parmacellus, Gryptella, Pectella, Vitrina, 
Ilelicolimax , Omalonyx, d. Plectrophorus, e. Testacellus, f. Helix, 
Streptaxis, Anostoma, Helicodouta, Polydontes, Pleurodonta, 
Dentellaria, Carocolla, Iberus, Chilotrema, Odontostylus, Heli- 
cophanla, Tapada, Amphibulina, Epistylium, Mesotnphyx, Pro- 
serpina, Delomphalus, Hyalina, g. Bulimus, Megaspira, Pupa, 
Abida, Clausilia, Balea, Siphonosloma, Bulimulus, Succinea, 
/i, Achatina, Macrospira, Polyphemus, Achatinella. 
25) J. D. W. Hartmann 1840 {Erd- und SUssw. Gast. 1. 
Syst. Uebers.) in Pneumoneatis Geophiiis sequentia habet genera; 
Auriculam, Glausiliatn, Ghondrum, Pupam, Bulimum, Helicem 
(cum subgeu. plur.), Helicophantam, Teslacellam, Vitrinam, Suc- 
cineam. 
26) Swainson 1840 (Treat. on Malae, p. 160 et 326.) in 
familia Helicidanm omnes sectiones Pulmonatorum comprehendit. 
Dispersa reperiuntur genera Heliceorum in subfamiliis Liniacina- 
rum (Vitrina, Stenopus, Succinea), Lucerninantm (Leiosloma, 
Lucerna, Lucernella, Pusiodon, Thelidomus), Helicinarum (Helix, 
Geolrochus, Pupa, Helicella), Achalinarum (Glausilia, Buliraus, 
Achatina). 
27) Ree ve 1841 (Proc. Zool. Soc. p. 76.) et 1842 (Gonch. 
syst. II. p. 64.) familiam Colimaceorwn in Pulmobranchialis habet. 
Genera: Helix, Garocolla, Anostoma, Pupa, Glausilia, Bulimus, 
Partula, Achatina, Succinea.. 
28) Gouid 1841 (Invert. of Massach. p. 160.) eodem nomine 
Colimaceorum familiam designat, ex qua genera tractantur: Helix, 
Pupa, Bulimus, Succinea (ct Auricula). 
29) A. Gallo w 1845 (Gonch. Nom.) omnino systema Reevea- 
num sequitur, atldito genere Achatinella. 
30) Agas si z 1847 (Nom. zool. Ind. univ.) nomen familiae 
mutandum proponit in : Ilelicoidae. 
De omnibus hisce auctorum methodis ct de vario modo, quo 
ipse familiam tractaverim, conferantur in Herrmannsen ind. 
gcn. Malacoz. prim.: Helicea, Helix Cuv., Colimacea etc. 
3. 
Geuera adoptata. 
Ktsi in familia Heliceorum typi sufficientes existere videantur 
ad formanda et determinanda bona genera, tum ex anitnalium 
structura peculiari, tum e testarum figura, tamen difficillimum 
