GASTEROPODA. 5 



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 resting 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. 



AMPHIBULIMA. Lam. 1805. 

 COCHLOHYDRA. Ferus. 1819. 



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

 fragile, subcorneous, semitransparent ; aperture large and entire, longitudinally 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 Succineae are strictly land animals, although capable of remaining a con- 

 siderable time under water. 



1 . SUCCINEA PUTRIS (?) Linn. Tab. I, fig. 5. 

 HELIX PTJTRIS. 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. Rossm. Icon. p. 91, t. 2, fig. 45, 1835. 



S. Testa elongato-ovatd, tenui, fragili ; anfractibus tribus convexiusculis, supra depressis, 

 suturis profundis ; aperturd ovatd, subverticaU. 



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. 



