Mollusks. 9147 
correct in saying that the snail which perforates the limestone at Tenby 
is the same as that of the Bois des Roches. It appears that twenty 
or thirty years ago, before the appearance of Turton’s ‘ Manual,’ and 
when his ‘ Dictionary’ was in much request, the common large snail 
was called hortensis as frequently at least as aspersa. 
William Baker to Prof. Buckland. 
Bridgwater, Oct. 6, 1841. 
In looking over the report of the proceedings at the Devonport 
meetings in the ‘Atheneum,’ I observed your notice of garden snails 
perforating limestone. I several years ago found numerous perforations 
in the under sides of naked rock on the upper part of Cannington Park, 
and many of the perforations were occupied by the common snail 
(Helix aspersa or hortensis). I have since found similar perforations 
and their tenants in the jew stone of the lias at Wedmore and other 
places. I trouble you with a few pieces of the Cannington Park stone, 
showing marks of very recent operations of the snail, and some of more 
remote, as evidenced by the covering of lichens on the latter. When 
I showed some specimens to our dear old friend Mr. Anstice, he was 
much interested, and we have made use of the discovery to illustrate 
the borings of the Pholadz, nearly in the same way that the subject 
was treated by vou and others at Devonport. 
Prof. Buckland to William Baker. 
Oxford, Oct. 27, 1841. 
Pray accept my best thanks for * * * and also for your spe- 
cimen of snail holes from Cannington Park, and the confirmation your 
observations afford of the power these animals possess of making holes 
on the limestone rocks they habitually and for a long series of years 
frequent. I have as yet only seen these holes on the ¢ompact lime- 
stone of the mountain and transition formations. 
Prof. Buckland to William Baker. 
Oxford, April 8, 1842. 
Your discoveries of abundant snail-holes is very interesting and con- 
firmative. You will oblige me by a uote detailing your observations 
more at length, which I may read to the Geological Society, where 
there are still many sceptics, who will not believe it because they have 
