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MOLLUSCA OF WRESSLE AND NEIGHBOURHOOD. 



GEORGE ROBERTS, 



Lofthozise, Wakefield; Author of the History and Topography of Loft house, etc. 



The parish of Wressle is situate on the banks of the Derwent, in the 

 East Riding of Yorkshire. The river rises near Robin Hood's Bay 

 in the North Riding, on the east coast, runs inland, and, after passing 

 through the central part of the East Riding, falls into the Ouse at 

 Barnby-on-the-Marsh. The district about Wressle is flat, and is 

 intersected by slow-running drains. The soil rests on sand ; height 

 above sea-level, about 30 feet. The tide comes up the river, and 

 vessels can get up with the flow to Malton. The flounder, and I 

 think some other species of small flat-fish, are found in the river and 

 in the dikes. The extensive ruins of Wressle Castle stand near the 

 river. The foss contains a little water • Conium maculatum and 

 Chenopodium Bonus-Henricus grow in it, and Dipsacus sylvestris 

 in a hedge close by. One of the ivy bushes which grow up the 

 castle walls is an enormous size ; the bole near the bottom will be 

 sixteen or seventeen inches in diameter. 



The mollusks enumerated in the following list were observed or 

 collected mainly during a day's visit to Wressle in August, 1884, and 

 another similar visit, in company with Mr. J. Beanland, of Bradford, 

 in July, 1886. A few of the species to which J.B. are affixed have 

 been collected by Mr. Beanland at other times during 1885-6. 



AQUATIC. 



Sphserium corneum. Near the Castle, and in Fleetdyke between 

 Wressle and Bubwith. Hundreds of young (July 1886), but 

 very few adults. 



Pisidium amnicum. Fleetdyke, J.B. 



Pisidium fontinale. Fleetdyke, on caddis case. 



Anodonta anatina var. ventricosa. Fleetdyke, dead shells. 



Anodonta cygnea. Newsholme, July 1886, J.B. 



Paludina contecta. A few, mostly young, in Fleetdyke, 1884. 



Bythinia tentaculata. Newsholme and Wressle, very common. 



Bythinia tentaculata var. cornea Locard. ' Horn-colour, more 

 or less pale, rather transparent.' Fleetdyke. 



Bythinia leachii. Fleetdyke, on caddis cases. Rare. 



Valvata piscinalis. Fleetdyke, in 1884 and 1886. 



Valvata piscinalis var. subcylindrica. Fleetdyke. 



Planorbis spirorbis. Newsholme, J.B. Wressle. 



Planorbis vortex. Fleetdyke, and near the Castle. 



Oct. 1886. 



