332 



MOLLUSC A. 



is very injurious to espaliers(l). There are but few persons 

 who have not heard of the curious facts respecting the repro- 

 duction of their amputated parts(2). 

 In others the shell is depressed, that is, the spire is flattened(3). 

 Some of these have ribs projecting internally(4), and there are 

 others in which the last whorl is suddenly recurved, (in the adult,) 

 assuming an irregular and plaited form(5). 



ViTRiNA, Drap. Helico-Limax, Feruss. 



The Vitrins are Helices with a very thin flattened shell, without 

 an umbilicus; the aperture large, but its margin not tumid^ the 

 body too large to be completely drawn into the shell,* the mantle has 

 a double border(6), the upper one, which is divided into several 

 lobes, extends considerably beyond the shell, and is reflected over it. 

 The known European species inhabit wet places, and are 

 very small(7). Hot climates produce larger ones. 



There are some species of Helix, in which the body can hardly 

 enter the shell, although not furnished with this double border, 

 which should be approximated to them(8). 



(1) Add the Hel. glauca,H. cit1fna;-H. rapa,H.castanea.H., globulus, 

 H. lactea,H. arhustorum,~H. fulva;H. epistylium;~H. cinda,H. ligata, 

 H. aspersa,H. extensa;H. nemorensis.H. fruUcuvi;H. lucena;H. vitta- 

 ta.H. rosacea; H. itaUa;H. lusitanica,H. amleata,H. turturum,H. 

 cretacea.H. fuscescens,H. terrestris,H. nivea.;H. hortensis,H. lucorum, 

 H.grisea,H. hsemastoma.H. pulla,H. venusta,H. pida, Gmel. &c. 



(2) See Spallanzani, Schceffer, Bonnet, Sic. 



(3) Hel. lapidda;H. dcatricosa;H. CEgopldalmus;H. oculus capri.H. al- 

 hdla,H. maculata.H. algira,II. lsevipes;H.vermiculata,H.exilis;~H. 

 caracolla;H. cornu militare,H. pelUs strpmtis;H. Gualteriana,H. oculus co7n. 

 munis;H. marginella.H. maculosa, H. naevia,H. corrugata;H. ericdo- 

 rum,H. nitens;H. costata;H. pulchdlasH. cellaria;H. ohvoluta,H. stri- 

 gosula.H. radiata;H. crystalUna.H. unguUna,H. volvulus; H.inwlvulus; 

 H. badia; H. cornu venatorium, &c. 



(4) Helsinuata;-H. lucerna.H. lychnuclius;-H. cepa,H. isogiiomostoma; 

 H. sinuosa; H. punctata, &c. 



(5) Hel. ringens, Chemn., IX, cix, 919, 920, the Axostoma of Lam., or Tomo- 

 GEKEs, Montf.; an analogous fossil shell is the Stbophostoma, Deshayes. See 

 also, pi. V, vi, vii, viii, of Draparn., with the accompanying descriptions; the 

 works of Sturm and Pfeiffer on the German species, but particularly see the splen- 

 did folio of M. de Ferussac on the "MoUusques terrestreset fluviatiles." 



(6) Termed by M. de Ferussac " iine cuirasse d un collier." 



(7) Hel pellucida, Miill. and Geoff. ; Vitrina pellucida, Drap,, VIII, 34 37: the 

 Helicarion, Quoy and Gaym., Zool. de Freycin., pi. Ixvii, 1; Feruss,, pi. ix, f. i j > 



(8) Hd, rufa and brevipes, Feruss., Drap., VIII, 2633. 



