THE LAND AND FRESHWATER MOLLUSCA OF DORSETSHIRE. 127 



upper one purplish brown, and smooth ; suture very 

 depp: spire bluntly pointed; mouth rounded, sliirhtlv angular 

 above; both lips thick, forming a perfect peristome. jvil- 

 di.sh within; operculum flattened, horn-like; whorls live; nucleus 

 eccentric, with oblique diverging striae, dirty white, violet at the 

 centre. L.O.tJ. B.0.4. 



Hab. Under stones and at the roots of brushwood. Generally 

 distributed ; extremely abundant in Purbeck. Quaternary 

 tufaceous deposit, Blashenwell, Kingston, Purbeck. 



APPENDIX. 



The following are included, in the List of Land and. Fresh- 

 water Shells published by the Purbeck Society in its uncom- 

 pled second volume, page 42, and which I inadvertently omitted 

 to incorporate in the preceding paper (J.C.M.P.). 



PISIDIUM AMNICUM, Corfe river at King Edward's Bridge, Sto- 



borough Meadow. 

 ,, PUSILLUM, Kiver on north side of Wareham ; Stoborough 



meadows. 

 BYTHINIA LEACHII, River Frome, streams at Swanage ; Ulwell ; 



Godlingston. 

 HELIX ACULEATA, Leeson Wood, Langton Matravers, 



(Beccks.). 



,, CAPER AT A, Worbarrow. 

 ,, PULCHELLA, Among the moss at Holme and, on the 



adjoining heath. 

 ZONITES PUSILLUS, Grange Wood. 



,, NITIDULUS, Leeson Wood, Langton Matravers, 



Beccles. 

 ,, CRYSTALLIIVUS, Grange Wood. 



I am indebted to Mr. Edgar A. Smith, F. L. S., of the British 

 Museum, and to Mr. E. Damon, F.G.S., for the valuable assist- 

 ance I have received from them in the preparation of this, and 

 for which I tender them my most grateful thanks. 



