CONCHYLIA— DIT/f F/2^. 41. 191 



Da Costa, p. 178, tab. 13, fig. 6. 



Donovan, British Shells, ii. tab. 54. 



Montagu, Test. Brit. p. 80. 



Linn. Trans, viii. p. 6.5. 



Titrton, British Fauna, p. 152. 



Dorset Catal. p. 31, tab. 7, fig. 6. 



Wood, Conch, p. 222, tab. 54, fig. 1. 



Dillwyn, Descri{)t. Catal. p. 123. 



Turton, Conch, Diet. p. 31. 



Chemnitz, vi. p. 191, tab. 18, fig. 1H5, 186. 

 Pectunculus «ubfuscus. Lister, Conch, tab. 332, fig. 169. 

 Mus. nost. English and Irish coasts. 



Shell growing to two inches and a half long, and two inches 

 broad, covered with a brownish-olive glossy skin, often marbled 

 with white and various hues of red, with very obscure longitu- 

 dinal striaj and remote transverse ones, fiattish and much pro- 

 duced on one side where the striated marks become totally 

 obliterated. 



This ihell, in its decay, offers a good exemplification of the 

 remark of Brard, in his note on the Succinea amphibia, p. 75: 

 that many species, after long exposure to the air in a dead state, 

 become thickened in their substance, either generally or par- 

 tially ; occasioned, as he supposes, by a sort of relaxation in their 

 testaceous taxture ; or probably by the absorption of oxygen, 

 and their gradual conversion into lime : and in this manner he 

 accounts for the thickness and distortion of most fossile shells. 



We have iii our cabinet some specimens, which appear to havs 



