138 Professor MacGillivray on a Species of Teredo 
February 25.—Clear sky in the morning. Unusually 
abundant spicule of hoar-frost over all the ground, and 
whitening the hills to their summits, like a shower of snow. 
Register thermometer through the night at 29°.—(Philosophi- 
cal Transactions of the Royat Society, London, for the year 
1842, part i. p. 87.) 
On a Species of Teredo found in Cork-floats, on the Coast of 
Aberdeenshire. By WILLIAM MACGILLIVRAY, A.M., LL.D., 
Professor of Natural History in Marischal College and 
University. (Communicated by the Author.) 
On the eastern coasts of the middle division of Scotland, 
timber perforated by Teredines is so very seldom met with, 
that, after a diligent search continued for many months, I 
had almost despaired of obtaining any species of these very 
interesting animals, when, in September 1844, having had 
the pleasure of making acquaintance with Lieutenant 
Paterson, of the Coast Guard, at Slains, I was informed 
by him, in answer to my inquiries, that he had found a 
spar on the rocks there which was full of them in the 
living state, and which he had used to repair a fence near 
his house. The species which had perforated this piece of 
wood, of large size, the holes being sufficient to admit 
Helix hortensis, I find to be different from Teredo navalis, 
as described by Deshayes and others; but not having been ~ 
able to detect its palmules, I refrain at present from saying 
anything further respecting it. Previous to this time, how- 
ever, in March 1843, after a storm, having found on the 
sands near Don mouth, a piece of a cork net-float. having a 
small specimen of Lepas sulcata upon it, I was agreeably 
surprised, several months after, when a little boy, who had 
been looking at it, shewed mea small white tube, which I 
found to be that of a Teredo. On cutting up the cork I met 
with several others, in some of which the shell was found 
entire. Unfortunately, however, the palmules, of the im- 
portance of which I was not then aware, were not. detected, 
so that an imperfect description only could have been given. 
In November 1844, I renewed the search, and after a strong 
