100 NEW AND RARE DORSET LAND SHELLS. 



Helix Pisana. I have never been able since to obtain any more 

 specimens, though a variety of H. virgata occurs there which 

 somewhat resembles them. Mr. Mansel-Pleydell mentions (on 

 Pulteney's authority) the capture of this species on sandbanks 

 between Lulworth and Weymouth. The next species of note is 

 Vertigo Moulinsiana. I found a few specimens of this rare shell 

 on the stem of bulrushes and other water plants in a swampy 

 piece of ground near a large stream in the village of Morden, about 

 four miles from Wareham. This was in August, 1889, and at the 

 time I supposed them to be a variety of V. antivertigo, but at the 

 meeting of the Conchological Society, in January, 1890, they were 

 named as V. Moulinsiana. During the months of August and 

 September, 1890, I searched carefully at the same spot, and in its 

 immediate neighbourhood and took in all about 200 specimens, 

 nearly all full grown. They were sitting on the stems of the 

 water sedges and rushes, which in many places grew in six inches of 

 water. I noticed then they did not appear to move about much. 

 In winter the place is often quite flooded with water and the plants 

 all die, and what becomes of the shells I do not quite know. I have 

 been unable to find any trace of them either in winter or spring, 

 and the only time when I can observe them is when the plants are 

 all up and flourishing. 



Mr. R. Standen, of Manchester, has kindly furnished me with 

 the following information about F. Moulinsiana: " F. Moulinsiana 

 was first discovered in England, about 1876, by Mr. Groves, who 

 found it in two localities one in Hampshire, and the other in the 

 neighbourhood of Hitchin, in Herefordshire, and Dr. Gwyn 

 Jeffreys found it at Ware Priory, Herts. It has also occurred in 

 Ireland, and was described in Annals and Mag. Nat. Hist. 1878, 

 as Vertigo Lilljeborjii (Westerlund), but Eimmer, who saw and 

 compared the specimens, seems to think they are all identical with 

 F. Moulinsiana. These are all the British localities recorded 

 before, and the habitats are the same, viz., marshes on reeds, &c., 

 except that of the Irish specimen, which occurred " under stones in 

 a damp place." 



