APPENDIX. 309 



One specimen only of this species, obtained by myself, is all that I have seen. It appears to be full 

 grown, though its sharp and reflexed outer lip is destroyed, but in all its other characters it perfectly 

 resembles the recent shell. 



HELIX INCARNATA? Muller. Tab. XXXI, fig. 17, a, b. 



HELIX INCARNATA. Miill. Loc. cit., p. 62, No. 259, 1773. 



Drop. Loc. cit., p. 100, No. 29, pi. 6, fig. 30, 1805. 



Pfieffer. Deutsch Landund Sussw. Moll., p. 33, pi. 2, fig. 15, 1821. 



Rossm. Loc. cit., p. 35, t. 26, fig. 361. 



Desk. Exped. de Moree, p. 160, No. 231. 



Brown. Geol. Journ., vol. viii, p. 190, fig. 4, a c, 1852. 



Spec. Char. "Testd subglobosd, depressiusculd, perforatd, pellucidd, corned; spird prominuld ; labro 

 margine rufescente, subreflexo." 



" Shell subglobosa, slightly depressed, perforated (umbilicated), pellucid, and corneous ; spire slightly 

 prominent ; margin of lip reflexed and reddish." 



Diameter, % inch. 



Locality. Fossil, Copford. Recent, France, and Belmont near Lausanne. 



Two or three specimens only of what most probably belonged to this species are all that I have seen. 

 They were obtained at Copford by Mr. John Brown, who has obligingly permitted me to have them 

 described ; they are unfortunately not in a very good state of preservation. The best specimen appears to 

 correspond with the recent shell ; but not being full grown, it has only five volutions instead of six, and is 

 evidently an immature individual, consequently wants the reflexed lip, the character of maturity. It differs 

 from rufescens, which is more depressed ; and from hispida in having a smaller umbilicus ; and our fossil is 

 more globose than either. The identification is not, however, perfectly satisfactory, and it would be desirable 

 to see a few more and better specimens. 



HELIX RUDERATA, Studer. Tab. XXXI, fig. 15, a, b. 



HELIX RUDERATA. Stud. Systemat. Verz. der Schweiz. Conch, s. 86, 1820. 



Hartman. Erd. et Sussw. Moll., No. 57, t. 11, fig. 11, 1821. 

 Pfief. Deutsch Land und Sussw. Moll., p. 31, t. 4, fig. 26, 1824 ? 

 Rossm. Icon. Land and Sussw. Moll., p. 13, t. 32, fig. 455. 

 Brown. Geol. Journ., vol. viii, p. 190, fig. 4, d, e, 1852. 

 ROTUNDATA, var. |8. Nils. Hist. Moll. Suec. Terr, et Fluv., s. 31, 1822. 



Spec. Char. "Testd perspective-umbilicatd, depressd, lutescente-cornea, concolor, subtilissime costulato- 

 striatd, spird convexd, anfractibus 4 5 subteretibus ; aperturd ovali ; peristomate recto, simplici, acuto." 

 Rossmasler. 



" Shell perspectively umbilicated, depressed, of a clouded or dirty-horn colour, very finely striated by 

 elevated lines of growth ; spire convex, volutions 4 5, tapering ; aperture ovate ; perietome plain, simple, 

 sharp." 



Diameter, % inch. 



Locality. Fossil, Clacton, Grays, Copford. 



Recent, Sweden, Finland, Russia, Styria, Switzerland, and Cincinnati, U. S. 



