2l6 JOURNAL OF CONCHOLOGY, VOL. 12, NO. 8, OCTOBER, IQoS. 



Vertigo antivertigfo Drap. in the Silverdale district, W. Lanes. — 



During the latter part of September and the beginning of October, Mr. Standen 

 and I spent some time in the above district searching for shells, etc. Amongst 

 the many found, we had the good fortune to make an addition to the census, 

 as well as to Mr. J. Davy Dean's comprehensive paper (antea p. 34) in the shape 

 of Vertigo antiverligo. The species was fairly common at the head of Hawes 

 Water, Silverdale, in company with Cochlicopa hibrica^ Caiychitnn miniimmi, 

 Viirea radiaiula, Eiiconuhis ftdviis var. alden, Piinduni pygmaum^ and Vertigo 

 pygmaa. At this point there is a great quantity of drifted vegetation, and it 

 was whilst working this for Coleoptera that the species was discovered. Though 

 pleased with our success here, we weie still more elated to find the species again 

 in evidence on the banks of the River Keer, near Carnforth. It simply swarmed 

 on the stems of the grasses and rushes and down at their roots. Amongst the 

 shells found with it were Vertigo fyginaa, Punctum pygmcEum, Jaminia muscortim 

 and var. brevis, Vitrea radiatitla, and numerous others, all more or less common. 

 Slugs were represented by Agriolimax agrestis, A. Itsvis, Arion kortensis, and A. 

 intermedins. The most abundant shell of all here, and in fact along the coast past 

 Ings Point, was a small form of Claitsilia bidentata. The smallest we found was 

 7 mm., and none exceeded 9 mm. in altitude. There was also a corresponding 

 diminution in breadth. At the former locality the species occurred amongst the 

 grass roots — a rather unusual habitat in this district. At Ings Point it occurred 

 with other .species under stones. Amongst the shells found here were Vertigo 

 ■fjygmcea, Jaminia muscortim (both abundant), J. cylindracea (rare), Vallonia 

 iukkella, V. costaia, Vitrea cellaria (large form — probably var. compactd), V. 

 nitidula, and Helicella caperata, amongst which was a specimen nearly twice 

 the size of its fellows and with three distinct bands above the periphery. The 

 large form of Vitrea cellaria appears to be common throughout the district, 

 as I have taken it at the Cove, Silverdale ; Ings Point ; Sandside, etc., as well 

 as across the Kent Estuary at Meathop and Grange. As mentioned in my note 

 in the Naturalist, the anatomy of the Grange specimens is practically that of 

 cellaria, though superficially the shells are apt to be mistaken for lucida. Some 

 of the localities of the above-mentioned species will be found to be additions 

 to Mr. Dean's list already referred to. — J. Wilfrid Jackson {Read before the ^ 

 Society, November 13th, 1907). 



List of Mollusca from one Chalk Pit in Surrey. —The number of species 

 which may be found in a small area is often very considerable and of no small 

 interest. Having paid several visits to a disused chalk pit and found the snails 

 therein to be plentiful, I have worked up the fauna more thoroughly, and have 

 obtained twenty-nine species from this limited area. The chalk pit is at Leatherhead, 

 in Surrey; it is of moderate size and has evidently not been used for many years, 

 as the bottom is completely covered with herbage and there are numbers of shrubs, 

 bramble tiushes, etc. There is a larch plantation round the margin, and the sides 

 are perpendicular except at one part which abuts on the high road ; here the side is 

 shelving to allow the descent of carts, and there is a lot of ivy growing round the 

 roots of small trees. Here also is a nettlebed overhung by shrubs and young beeches 

 which shed their dead leaves into it; this spot proved to be very prolific. The 

 centre of the pit is covered with short grass and there is a large clump of wild parsnip, 

 about which I have more to say later. The list of twenty-nine species includes those 

 which inhabit the pit at the present time. I have found several empty and weathered 



