146 JOURNAL OF CONCHOLOGY, VOT.. I3, NO. 5, JANUARY, I9II. 



The details in form vary greatly in different species ; as you may 

 note, the spines of the two I have brought differ very greatly, and I 

 could show half-a-dozen more. It can readily be understood what a 

 valuable character this becomes in the identification of species of 

 shells from Africa, Madagascar, the Mauritius, South Sea Islands, 

 etc., indiscriminately placed in Helicarion. Still more, how valuable 

 it is, combined with other characters, in placing genera in their true 

 family position, for we may presume that the process that goes on 

 during the period of formation of an organ of this kind is one far 

 older in time than many modifications of the external form of the 

 animal or of the shell that may be brought about. 



In making these remarks I know full well only a few of our mem- 

 bers can undertake investigation of these obscure characters, but all 

 can aid those who do, in preserving the animals at a time when one is 

 most likely to secure the spermatophore of the dozens of species we 

 know now little or nothing about. 



Vertigo substriata Jeffreys in Bucks. — On September 3rd, 1910, I found a 

 few V. substriata at Burnham Beeches. This appears to lie a new record for Bucks. 

 On the same day Mr. F. M. Dyke took a single V. pJisilla, thus confirming the 

 previous record for Bucks. — a solitary specimen found at East Burnham a few years 

 ago by Mr. Wallis Kew. — J. E. Cooper {Read before the Society, Nov. 9th, 1910). 



Clausilia cravenensis Taylor var. albina nov. — In September last, one of 

 my enthusiastic friends, Mr. T. H. Newlands, gave me some snails which he had 

 collected from the limestone near Crosby Ravensworth, in Westmorland. I at 

 once detected, among a number of the type, a pure white example of this species, 

 the first I had either seen or heard of. Clausilia cravenensis, deservedly, now 

 ranks as a species in the Census Lists published by Mr. J. W. Taylor in co-operation 

 with this Society and its workers. — J. Davy Dean {^Read before the Society, 

 Nov. 9th, 1910). 



Clausilia bidentata Strom var. albina Moq.— In May, 1908, I took near 

 Burton-in-Kendal and in Westmorland, the rarely occurring albino of this species, 

 not hitherto recorded for this district.— J. Davy Dean {Read before the Society, 

 Nov. 9th, 1 910). 



