Quarterly Journal of Conchology. 7 



Planorbis glaber var. compressa — Shell more concave 

 below than in the type, and only depressed in the centre on the 

 upper side, the whorls also are rounder and do not increase so 

 quickly, making the whole shell more compact. Found in the 

 neighbourhood of Birmingham. — R. M. Lloyd, 60, Villa-road, 

 Handsworth, Birmingham, December i8th, 1873. 



ON THE OCCURRENCE OF COCHLICOPA TRIDENS 

 var CR YSTALLINA, Dupuy, IN THE NEIGHBOUR- 

 HOOD OF BIRMINGHAM. 



By G. SHERRIFF TYE. 



Any interested reader turning to page 291, vol. I. of Mr. 

 Jeffreys' "British Conchology," will there find recorded the occur- 

 rence of this lovely little shell at Weoley Castle. [In Mr. Jeffrey's 

 book spelt "Wheeley."] I believe the original spot from whence 

 the shells here indicated were taken, is in a garden now attached 

 to a farm-house. A short distance from this spot my friend Mr. 

 Nelson, after diligent search, was rewarded by finding two or three 

 shells, shewing much to our mutual satisfaction, that this charming 

 variety still inhabits the locality. 



Having hitherto looked upon it as a rarity, I consider myself 

 fortunate in having since found it in three other places in the 

 Birmingham district. First at Perry Bar, secondly at Hamstead, at 

 the former place I found an interesting variety of a pale whitish 

 yellow colour, more opaque than crystal Una, but brilliant. 

 Hamstead furnished the greatest number of the crystalline variety. 

 My friends, Messrs. Nelson and Lloyd and myself, obtained amongst 

 us nearly two dozen shells, yet left many young to furnish a 

 progeny for future collectors. 



The third habitat is Dudley, where, on a pleasant day in April 

 this year, Mr. Lloyd and myself found it in company with C. lubrica 

 and Carychiuni niininiuni in the still romantic grounds of Dudley 

 Castle. 



These three localities are all in the county of Stafford, and 

 their distance from Birmingham is as follows : — Perry Bar, 2| miles; 

 Hamstead, 2^ miles ; Dudley about 8 miles. Weoley Castle is in 

 Worcestershire, and is situated about 4I miles from Birmingham. 



A single specimen has also been taken by Mr. Shrive, near 

 Knowle, Warwickshire. 



C. tridens is distributed throughout the neighbourhood of 

 Birmingham, occurring abundantly in many places and sparingly 

 in others ; indeed a collector searching for it in almost any "likely 

 looking" locality would hardly be disappointed, yet it appears to 

 be much less plentiful in other districts. 



It would be interesting to learn the distribution of this species 

 in Great Britain. The records of its occurrence in our eastern 

 counties are rare, and it is doubtful whether it inhabits Scotland or 

 Ireland. Mr. Jeffreys has recorded one locality for it in Wales. 



It may be looked for at the roots of grass {i.e., at the base of 

 the blades) or in the middle of thick tufts, among moss, or under 



