JOURNAL OF CONCHOLOGY. 1 3 



New Yorkshire Locality for Planorbis lineatus. — 



This interesting species — for which Dringhouses Bog near York 

 has long been the only locality recorded for the county — was 

 discovered at Hornsea Mere in the East riding in 1881 on the 

 occasion of the Yorkshire NaturaHsts' Union's excursion. They 

 were discovered by my friend Mr. J. Darker Butterell, and I 

 also had the pleasure of collecting a series, being in his company 

 at the time. They were common but very local, and had a 

 predilection, as at Dringhouses, for the shallow water on the 

 grassy margins of the Mere. — Wm. Denison Roebuck. 



Ancylus lacustris var. albida at Christchurch. — 



We find this species in the River Stour, located as usual on the 

 leaves and stems of the water-lily, but the ten or twelve speci- 

 mens met with all belong to the white variety. The milk-white 

 shells are covered with a light-green vegetable coating. Ancylus 

 fluviatiiis occasionally occurs with it, but is of typical character. 



— C. ASHFORD. 



Pulsations of Helix rufescens. — I have satisfactorily 

 traced continuous heart-action in this species throughout the 

 autumn and winter, down to a temperature of 31° F. Just 

 below freezing point the contractions numbered five to six a 

 minute — full and very deliberate. In Hampshire, H. rufescens 

 retires temporarily when the thermometer falls below 38° or 40°. 

 Above 40° some — both adult and young — are to be found about 

 during any damp night in winter. — C. Ashford. 



Pupa umbilicata Drap. — A variety of this species is 

 mentioned by Mr. R. Tate in his "British Mollusks," p 154, as 

 having two teeth or denticles. It is however worthy of remark 

 that he makes no mention of the bigranate form of Pupa mar- 

 ghmia, and it is therefore not improbable that the remark was 

 intended to be applied to that species and not to F. umbilicata. 

 —J. W. Taylor. 



