69 



ESTUARINE SHELLS. 



UNIVALVES. 



LlTTORlNIDiE. 



Littorina litoralis, Lin. On the rocks near Purton Passage. Not 

 common. 



Littorina rudis Donovan 'J Sharpness Point, and Lydney piers, 



var. saxatilis. and tenebrosa. / Common. 



Rissoa ulvae, Pennant. Brackish water ditches at Shirehampton, but 

 more abundant on the opposite bank of the Avon, in the water- 

 course running some distance parallel to it, from the direction of 

 Pill towards Kingroad, where it may be taken in any quantity, 

 with its well marked variety, 



R. barleei. 



BIVALVES. 



TeLLINIDjE. 



Tellina tenuis, Da Costa. Purton Passage. 



T. solidula, Pulteney. „ 



Syndosmya alba, Wood. ,, 



These three species may generally be sparingly met with, at low 

 water, upon the silurian rocks, upon the edges of which the ferry- 

 man generally lands his passengers, and which are easily accessible 

 to those who do not mind a little mud. 



Notes on habits of Freshwater Shells, read at Dursley. 



Neritina fluviatilis has been found, so far as I am concerned, of 

 greater size and finer colours on the towing-path side of the canal, 

 within hand-reach, near Sharpness Point, than anywhere else in the 

 county ; surpassing, in fact, in these respects those from Wainload or 

 any locality in Britain known to me. 



Testacella haliotoidea is generally supposed to be exceedingly limited 

 in its distribution in England, and of doubtful nativity. It has been 

 no stranger to me since I first began to collect moUusca, and was, 

 many years since, particularly abundant in "Wheeler's nursery, in the 

 Northgate Street, Gloucester. So abundant is it now in many gardens 

 in Gloucester, that in the early part of the present year, I was enabled, 



