54 COLIMACEA. 



columella confluent with the outer lip, and situate on the lower 

 portion of the axis. Some species are umbilicated, and others 

 not so ; destitute of an operculum. 



Several species, however, have the power of forming a calca- 

 reous lid, fitting the aperture, to the external edges of which, 

 the animal firmly cements it after retiring to its hybernaculum 

 in winter. This lid has been termed by some authors an 

 epiphragm. 



This genus has been divided into several sub-genera. 



Sub- Genus 1 . — Helicogena. — Ferussac. 



Body volution large ; axis solid ; destitute of an umbilicus ; 

 aperture large. 



1. Helix Pomatia, pi. VI, f. 1,2, 3. 



Helix Pomatia, Limuvus, Syst. Nat., p. 1244; Gmclin, Linn. 

 Syst., p. 3G27 ; Lister, Conch., pi. 48, f. 46 ; Pennant, Brit. 

 Zool., IV, p. 134, pi. 84, f. 128; Cochlea Pomatia, Da Costa, 

 Brit. Sh., p. 67, pi. 4, f. 14; Donovan, Brit. Sh., Ill, pi. 84; 

 MuUer, Verm., II, p. 43, No. 243; Turton's Linne, IV, p. 513; 

 lb., Man., p. 44, pi. 4, f. 34; lb., Brit. Fau., p. 190; Montagu, 

 Test. Brit., p. 408; Brard, p. 19, ph 1, f- 5; Drapernaud, Hist, 

 des Moll., p. 87, pi. 5, f. 20, 21, 22; Pfeiflfer, I, p. 25, pi. 2, f. 9; 

 Brown, Ency. Brit., 6th Ed., VI, p. 458 ; lb., Ency. Edinensis, 

 II, p. 554, pi. 55, f. 5; Aider, Mag. Zool. and Bot., II, p. 106; 

 Pomatia antiquorum. Leach, Moll., p. 89 ; Helix Pomatia, 

 Brown, Illust. Conch., p. 43, pi. 16, f. 12 and 14; lb.. First 

 Ed., pi. 39, f. 12 and 14. 



Shell subglobose, rather strong; body very large, ventricose; 

 spire small, consisting of four somewhat inflated, well divided 

 volutions, terminating in an obtuse apex ; whole shell with 

 rather strong, longitudinal stria3, and crossed by very minute, 

 spiral striaj, but not so strong as to produce a reticulated 

 appearance; aperture nearly sublunate; pillar lip white, or very 

 pale rose-colour, considerably spread over the columella ; outer 

 lip slightly reflected, and somewhat thickened on the margin ; 

 whole shell covered with a thin yellowish-brown epidermis, with 

 three or four broad, transversely spiral, reddish-brown bands 

 beneath it on the body volution, and generally one narrow band 

 on the superior volutions ; inside of aperture pale brownish- 



