INTRODUCTIO. XI 



iractala siint, quarum utraque genera comprehendit nuda et testa - ^>^/rPi^^ 

 praedita. In familia Arionidarum genera sunt sequentia: a. Arion, ■''^//'■■^°9 '^c 

 Phosphorax, h. Helicarion, c. Nanina, Stenopus, d. Zonites — ''^'JZ^^^f^^ 

 in familia //^efodrfanfm haec: a. Limacellus, Scutelligera (e classe.;,/L,^/yli; 

 MoUuscorum jamdiu eliminata), Mehimatium (Meghimatium van /" '/. 9.^'"- 

 Hass., Fer.), h. Limax, c. Parmacellus, Cryptella, Pectella, Vitrina, ' " -'''-" 

 Helicolimax, Omalonyx, d. Plectrophorus, e. Testacellus, f. Helix, 

 Streptaxis, Anostoma, Helicodonta, Polydontes, Pleurodonta, 

 Dentellaria, Carocolla, Iberus, Chilotrema, Odontoslylus, Heli- 

 cophanta, Tapada, Amphibulina, Epistylium, Mesomphyx, Pro- 

 serpina, Delomphalus, Ilyalina, g. Bulimus, Megaspira, Pupa, 

 Abida, Clausilia, Balea, Siphonostoma, Bulimulus, Succinea, 

 /i. Achatina, Macrospira, Polyphemus, Achatinella. 



25) J. D. W. Hartmann 1840 (Erd- und Stlssw. Gast. I. 

 Syst. Uebers. ) in Pneumoneatis Geophilis sequentia habet genera: 

 Auriculam, Glausiliam, Chondrum, Pupam, Bulimum, Helicem 

 (cum subgen. plur.), Helicophantam, Testacellam, Vitrinam, Suc- 

 cineam. 



26) Swainson 1840 (Treat. on Malac. p. 160 et 326.) in 

 familia Helicidarum omnes sectiones Pulmonatorum comprehendil. 

 Dispersa reperiuntur genera Heliceorum in subfamiliis Limacina- 

 rum (Vitrina, Stenopus, Succinea), Lucerninarum (Leiosloma, 

 Lucerna, Lucernella, Pusiodon, Thelidomus), Helicinarum (Helix, 

 Geotrochus, Pupa, Helicella), Achatinarum (Clausilia, Bulimus, 

 Achatina). 



27) Reeve 1841 (Proc. Zool. Soc. p. 76.) et 1842 (Conch. 

 syst. II. p. 64.) familiam Colimaceorum, in Pulmobranchiatis habet. 

 Genera: Helix, Carocolla, Anostoma, Pupa, Clausilia, Bulimus, 

 Partula, Achalina . Succinea. 



28) Gould 1841 (Invert. of Massach. p. 169.) eodem nomine 

 Colimaceorim familiam designat, ex qua genera tractantur: Helix. 

 Pupa, Bulimus, Succinea (et Auricula). 



29) A. Catlo w 1845 (Conch. Nom.) omnino systema Reevea- 

 num sequitur, addito genere Achatinella. 



30) Agassiz 1847 (Nom. zool. Ind. univ.) nomen familiae 

 mutandum proponit in: Helicoidae. 



De omnibus hisce auctorum methodis et de vario modo, quo 

 ipse familiam tractaverim, conferantur in Herrmannsen ind. 

 gen. Malacoz. prim. : Helicea, Helix Cuv., Colimacea etc. 



§. 3. 



C^enera adoptata. 



- Elsi in familia Heliceorum typi sufficientes existere videantur 

 ad formanda et determinanda bona genera , lum ex animalium 

 structura peculiari, tum e lestarum figura, tamen difficillimum 



