1 86 Quarterly Journal of Conchology. 



notice the satisfactory and systematic way in which its investigation 

 is commenced, with feeHngs of pleasure. 



Geographically, the endeavour is, in the first place, to work out 

 the conchology in detail of the county (Yorkshire) in which the 

 town is situated; for this purpose the county is divided into a 

 number of subdistricts based upon the river-basins and watersheds, 

 and also upon the geological structure and topographical configur- 

 ation of the ground. At the end of every season will be published in 

 a tabular form a list of the shells exhibited, and showing at the 

 same time to what extent the shells of each subdistrict have been 

 worked at. This will also show what are the deficiencies in the 

 records for each subdistrict — a point which it is often as necessary 

 for the investigator to know as the converse is. We cannot too 

 heartily approve the principle of naturalists working their own dis- 

 tricts in a systematic and detailed manner. 



In the second place it is intended to exhibit and place on record 

 shells from all other parts of the British Isles and of the world at 

 large and ultimately it may be desirable to adopt some modified 

 plan of tabulating the results in this direction also. 



While this is being done for geographical conchology every other 

 department is intended to be taken up at the meetings. 



We have no doubt that assistance will be welcomed and are 

 quite sure that any information will be furnished by the officers of 

 the Society, or by the Secretary W. D. Roebuck, Esq., 9, Sunny 

 Bank Terrace, Leeds. 



Ancylus fluviatilis var. gibbosa, { Bourguignat ), near 

 Leeds. — In 1862, I found characteristic specimens of this well 

 marked variety, adhering to confervoid covered stones in a shallow 

 rivulet near its source, in a dense portion of a wood at Thorner, 

 near Leeds. 



On recently revisiting the locality I was pleased to find this 

 interesting form still existing in the same place — W. Nelson. 



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