Mollusks. 4541 



found it at York, along with Planorbis corneus and Cyclas rivicola, 

 which he states are not found further north than Nottinghamshire. 



Paludina achatina. Abundant in the Cherwell and the Oxford 

 Canal. 



Bithinia tentaculata. Common in most of our streams. 



„ ventricosa. The Cherwell. 

 Valvata piscinalis. Abundant in the Cherwell. 



„ cristata. Rare. The moat at Broughton Castle. 

 Anon ater. Very abundant. 



" hortensis. A few specimens in the same localities as Limax 

 agrestis. 



Limax maximus. Not uncommon in damp situations. 



„ flavus. Rather common in the cellars here. They are diffi- 

 cult to find, as they do not come out of their hiding-places till about 

 midnight. I found one specimen which was infested with a colony of 

 white lice, which ran swiftly about its body without any seeming in- 

 convenience.* 



„ agrestis. Very abundant. 

 Vitrina pellucida. Common in moist herbage at the bottom of 

 hedges. 



Helix aspersa. Common every where. 

 „ hortensis. Not uncommon along with H. nemoralis. 

 „ hybrida. A few specimens in a small wood, with hundreds 

 of H. nemoralis. 



„ nemoralis. Very common. 



„ Pomatia. I have not found this species nearer than Charl- 

 bury Forest, where it is abundant. 



„ arbustorum. Common, but local ; feeding on the rank herb- 

 age in damp ditches. 



„ lapicida. Not uncommon amongst loose stones at Charl- 

 bury. 



„ pulchella. Common in moss and under stones. I have 

 found the variety imbricata in dry situations, as mentioned by C. 

 Ashford in his list of shells found at Ackworth (Zool. 4262). 

 „ fulva. Not unfrequent in damp woods. 

 „ aculeata. Amongst decaying vegetable matter at the bottom 

 of hedges. 



„ hispida. Common under stones. 



„ rufescens. Common in the hedge opposite the Union. 



* This circumstance is of frequent, if not constant, occurrence. — Ed. 

 XIII. C 



