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FURTHER NOTES ON THE HOLOCEXE XOX-MARIXE SHELLS OF 

 PERRANZABULOE, CORNWALL. 



By Ikv. 11. AsHiNGTON BoLLEx, B.A., F.G.S. 



Jiead I4lh May, 1909. 



In coatinuatiou of my observations on the blown sand deposits of 

 Perranzabuloe last JN'ovember, I was able to pay a further visit to 

 Cornwall last January. 



These sands are divided into three districts — (1) the Eeen Sands 

 near Perranporth, (2) the Gear Sands towards the central area, and 

 (3) the Penhale Sands to the north, near Cubert. The fluviatile 

 (lacustrine) deposit occurs on the Gear Sands, from which the farmers 

 are accustomed to draw their supplies of shell-sand for fertilizing 

 purposes, evidently a well-recognized work, as there is a toll-house 

 where they pay the dues to the owner of the sands for this privilege. 

 This is interesting to us, since it is in the lacustrine area and its 

 neighbourhood that the greater part of the sand-carting is done. 

 Add to this the constant destruction of the now dessicated lacustrine 

 area by the wind, as detailed in vaj last paper, and the wonder is, 

 not that there is so little of this deposit left, but that there is any 

 at all. I have found no further species to record. The finding of 

 Limnaeas at a higher level (about 8 feet) in the same superficial marly 

 sand shows that the lake area was basin-shaped,, and not merely 

 a shallow flatfish area. 



After consultation with Mr. A. Santer Kennard, F.G.S., I find that 

 the doubtful Limuseas may be ranged under L. pereger and L. inmcatula, 

 with the exception of a Limnaea which is probably a new species, 

 being identical with a form occurring in Ireland which has been mis- 

 called L. aurieularia, var. acuta. The Succineas also are to be classed 

 under S. elegaiis ; a possible oUonga must be crossed out and omitted 

 from the list. 



Mr. Penrose accompanied me to the place, and promised to see 

 whether the collection of the Royal Institution of Cornwall, which is 

 under his charge as Curator, contained anything that would throw light 

 on the question, but I have heard nothing further on the matter. 



Mr. Kennard considers this find as of great importance. His 

 remarks are as follows : — " I have been over your shells carefully, and 

 a more remarkable lot of Limnaeas I have never seen. I have com- 

 pared them Avith my own collection, and that is a large one of fossil 

 and recent LimncBa pereger, and there are many that I cannot match. 

 One thing that strikes one is the great variation va. pereger \ some are 

 dwarfed, others are large, nearly all are very thick. Some are fairly 

 typical, but these gradually pass into the narrow, slender, compressed 

 form. These latter are something like what is called on the Continent 

 L. siiccinea, Nilsson, only the characters of that form are more pro- 

 nounced in the Cornish shells. Now thick shells are found either in 

 rapid waters or greatly disturbed waters, so that if there were a lake 



