182 
MITCHELL : DRIFT DEPOSITS OF THE VALE UF MoWBUAV. 
The holes have been nearly globular, but have a short neck 
through which the tenant communicated with the outside. The 
cavity is almost exactly like that of a mould for casting a round 
bullet, the hole by which the hot head enters corresponding to the 
narrow neck in the stone. I consider that these borings were made 
by a Pleistocene Saxicava, and the size of the cavities appear to 
indicate that they were formed by S. artica. This is the more likely, 
as the few fossils of the drift were for the most part of a northern 
type. 
:N0TES on some singular cavities in THE MAGNESIAN LIMESTONE. 
BY REV. J. STANLEY TUTE, B.A. 
PLATE VI. 
The cavities or burrows in the Permian Limestone near Wormald 
Green Station, to which I wish to draw your attention, are of sucli 
obscure origin that at one time one is inclined to refer them to the 
excavations of some early form of Gastrocluena ; at another to an 
annelid ; then to one of the alg^e. Without attempting to say what 
they really are, I venture only to describe their forms and their posi- 
tion in the limestone, and what I have been able to gather from the 
observations of others, hoping that the members here present may be 
able to throw so much light upon the matter that we may come to 
some probable conclusion as to their origin. 
An old quarry, about a quarter of a mile west of Wormald Green, 
which had been for a long time disused, was opened again a few 
months ago. In the old and new section about 60 or 70 feet of the 
middle beds of the Lower Magnesian Limestone have been exposed. 
Throughout 30 feet of the upper portion of the new part there occur 
innumerable grooves and cavities of a singular character, agreeing 
with certain fossil remains which are mentioned by Mr. J. W. Kirkby 
in a paper read before the Geological Society in 1861,'" as occurring in 
the Lower Permian Limestone of South Yorkshire, at Hampole 
Stubbs. He says, the occurrence of another Fossil, of somewhat 
obscure affinities, though possibly an annelid, may here be noticed. 
It is the cast of a laterally compressed tube three inches long (neither 
* Quait. Journ. Geological Society 1861, vol. xvii., p. 309. 
