MOLLUSCA. 813 



Sp. Pliysa fontinalis DRAP., Bulla fontinalis L., STURM Deutschl. Fauna, 

 vi. Heft 4, Tab. 10; Physa hypnorum DRAP., Sulla Jiypnorum'L., STURM 

 1. 1. Tab. n, Cuv. R. Ani., ed. ill., Moll. PI. 26, fig. 5. 



Planorbis BRUG. Tentacles setaceous, very long. Foot short. 

 Shell disciform, with all the wreaths conspicuous on both sides. 

 Aperture almost lunate, with margin not reflected. 



These snails live with Limnceus in stagnant fresh water, and have, how- 

 ever remarkably the external form differs, almost the same internal structure 

 as the species of that genus. Compare SWAMMERDAM Bijbel der Nat. I. bl. 

 186 189, CUVIER Ann. du Mus. vn. pp. 194 196, PI. x. figs. 12 15, 

 Mollusq., Mem. 14. 



Sp. Planorlis corneus, Helix cornea L., BLAINV. Malacol. PI. 37 bis, fig. 3, 

 STURM 1. 1. Tab. 4, GUERIN Iconogr., Moll. PI. 7, fig. 2, &c. 



Auricula LAM. (spec, from genus Valuta L.). Two conical 

 tentacles. Shell oval or oblongo-ovate. Aperture longitudinal, 

 with labrum often reflected. Columella folded. 



To this genus belong species that live on land, although elsewhere these 

 molluscs, like Helix, are distinguished by four tentacles. Different genera 

 have been adopted here, as Carychium MUELL. and Scardbus MONTF., 

 Scardbcea Cuv. This last genus is distinguished by a shell longitudinally 

 compressed into a margin on each side (carinated). 



Compare DESHAYES Diet, univers. d'ffist. not. I. 1842, pp. 345 348, 

 the article Auricule; TROSCHEL in WIEGMANN'S Archiv, 1838, i. pp. 202 

 208, on Scarabus, and KEEVE on the same sub -genus, Ann. of Nat. Hist. 

 ix. pp. 218 221. 



Sp. Auricula midce, Voluta Auris Midce L., D'ARGENV. Conchyl. PL 10, 

 fig. G, Encycl. meth., Vers. PI. 460, fig. 6, GUERIN Iconogr., Mollusq. PI. 

 7, fig. 7, QUOT et GAIM. Astrolabe, Zool. PI. 14 (fig. with the animal, trans- 

 ferred in CUVIER R. Ani., ed. ill, Moll. PI. 27, fig. i) ; New Guinea, not 

 far from the shore ; Auricula judce, Voluta Auris Judos L., BLAINV. Malacol. 

 PI. 38, fig. i --Auricula scardbcea, Helix Scardbceus L., Scarabus imbrium 

 MONTF., CHEMN. Tab. 136, figs. 1249, 1250, KEEVE Ann. of Nat. Hist. 1.1. 

 PI. 4, fig. ii ; lives in the E. Indies, in woods at the roots of trees, &c. 



Phalanx II. Eyes at the point of tentacles. Tentacles most 

 frequently four ; two superior placed more backwards, larger ; in- 

 ferior short (sometimes obsolete). Mollusca pneumonica terrestria 

 aut amphibia. 



A. Testacea (Helicina}. 



Pupa DRAP., LAM. (spec, of Turbo L.). Animal with inferior 

 tentacles very short or none (Vertigo MUELL.). Shell elliptical or 

 cylindrical, with aperture semirotund, in most dentate. 



