GASTEROPODA. 5 



be considered as not of the age of the Coralline Crag. The material in which they 

 are found may probably be a disturbed deposit of a more recent period. I have 

 also found this species, with its operculum in position, in the superficial earth rest- 

 ing upon the Red Crag, at the depth of six or eight feet from the surface, but have 

 never seen it in a living state in the eastern part of the county of Suffolk. 



Succinea,* Drop. 1805. 



Amphieulima. Lam. 1805. 

 Cochlohydra. Ferus. 1819. 



Gen. Char. Shell ovate, rather elongate ; volutions few ; spire short ; texture 

 thin, fragile, subcorneous, semitransparent ; aperture large and entire, longitu- 

 dinally ovate ; peritreme sharp, and confluent with the columella, inner lip spread 

 over a part of the body whorl. 



This approaches in general form the genus Limnsea, but may be distinguished by 

 the absence of an oblique fold, which is always more or less distinct upon the 

 columella of the latter. The British species are found about the margins of ponds 

 and ditches, where the surface is moist and damp, and generally upon the stems 

 and leaves of plants. The Succineas are strictly land animals, although capable of 

 remaining a considerable time under water. 



1. Succinea puteis (?) Linn. Tab. I, fig. 5. 



Helix putris. Linn. Syst. Nat. p. 1249, 1766. 



— succinea. Mull. Verm. 11, p. 97, No. 296, 1774. 



— putris. Mont. Test. Brit. p. 376, t. 16, fig. 4, 1803. 

 Succinea amphibia. Drop. Moll. p. 58, t. 3, fig. 22, 23, 1805. 



— putris. Flem. Brit. An. p. 267, 1828. 



— amphibia. Rbssm. Icon. p. 91, t. 2, fig. 45, 1835. 



8. Testa elongato-ovatd, tenui,frar/ili; anfractibus tribus convexiusculis, supra depressis, 

 suturis profundis ; aperturd ovatd, subverticali. 



Shell elongato-ovate, thin and fragile, with about three slightly convex volutions, 

 rather depressed on the upper part ; aperture broadly ovate, subvertical ; suture 

 moderately deep. 



Axis, § of an inch. 



Locality. Mam. Crag, Bramerton. Recent, Britain. 



This species I presume to be rare ; but one specimen has come into my possession 

 since the publication of my Catalogue, and this appears to be only a little more 

 elongated than the general form of this species, but in that character it is variable, 

 especially among my specimens from the fluviatile deposit at Stutton, where it is 

 abundant. The artist has given rather too great an expansion to the lower part of 

 the aperture ; bringing the resemblance too near to the following species. It is, 

 however, a doubtful identification. 



* Etym. Succineus, of amber. 



