Mollusks. 4543 



Velletia lacustris. Not uncommon under the leaves of plants in 

 the Cherwell. 



Physa fontinalis. In the Cherwell. 

 Planorbis corneus. Not uncommon in the river. 

 „ laevis. Moat at Broughton Castle. 

 „ marginatus. Very common. 



„ vortex. Common in small ponds and ditches. 



,> spirorbis. Ditto. 

 „ nitidus. Rare. 



„ contortus. A few specimens of this species have oc- 



curred. 



Cyclas rivicola. Very common in the Cherwell. 

 „ cornea. Common in the river. 

 „ calyculata. In a large pond at Hanwell. 

 Pisidium nitidum. Ditto. 



„ Henslovianum. Two or three specimens from the moat 

 at Broughton. 



„ amnicum. Common in the river and along with P. nitidum. 

 „ cinereum. A large pond at Hanwell. 

 Anodon cygneus. Very abundant ; the varieties are so numerous 

 that I cannot say with certainty which are found in this neighbour- 

 hood. 



Unio pictorum. Not uncommon in the Cherwell. 

 Dreissina polymorpha. The sides of the canal for some distance 

 are lined with multitudes of this species of all sizes : the large speci- 

 mens are much corroded at the umbones. 



In conclusion, I will just mention a method of representing the 

 animals of Mollusca generally, which is peculiarly applicable to the 

 genera Arion, Limax, and others which have either a very small 

 shell or none at all. I have seen it carried out to some extent in the 

 cabinet of a friend of mine in this town, and the effect is extremely 

 good. He models the animal in a paste made of new white bread, 

 worked between the fingers to such a consistency that it is easily 

 moulded without cracking, and when it is nearly dry he paints it the 

 natural colour, and varnishes it over. The semitransparency of the 

 body is beautifully imitated by this method if the paste is kept 

 clean. 



Richakd Stretch. 



Parsons Street, Banbury, 

 November 18, 1854. 



