292 Proceedings of the Royal Society of Edinburgh. [Sess. 
The flints were sent to Mr Jukes-Browne, who kindly examined them, 
and some were eventually sent to Dr Kitchin. They are, as a whole, Upper 
Chalk forms, with the exception of the Holaster. Of this Dr Kitchin 
writes — it does not seem to agree with any Holaster planus, — “ The base is 
too flat and its boundary with the sides too abruptly deflned ; there are also 
other points of difference — for instance, the depth of the sulcus and the well- 
defined character of the carinse. I am not inclined to name it definitely.’" 
Mr Jukes-Browne came to the conclusion that it was probably a well-marked 
variety of H. Icevis, if not a new species. It must be remembered that the 
specimen in question is a cast in flint. 
Thirteen sections were cut from these flints with a view of ascertaining 
if a comparison could be made between them and any of the Belhelvie 
specimens. All the sections appeared to be pseudomorphs of the chalk 
within which they were formed, in some cases showing distinctly the forms 
of the micro-organisms contained in the rock ; in others such details are less 
apparent. As a whole they offer little evidence for comparison. In one, 
however (spine of Gidaris sceptrifera), spheres are well marked and 
abundant, and the original deposit may perhaps be compared with A 1, 
B 4, or BIO. The flint with B. mucronata also contains many spheres : 
these are of large size and suggest comparison with G 6 and 14, specimens 
found by the Goldseeker north-west of the Shetlands, rather than with any 
Belhelvie boulder. 
With two exceptions sponge spicules are not abundant in any of them, 
though traces occur in all. In one, however (with Spondylus latus), many 
thin thread-like spicules occur, resembling those of B 9, while the flint 
itself seems to represent a somewhat similar chalk. In a section cut from 
one of the Ventriculites — not, however, intersecting the fossil — spicules are 
more in evidence, two or three large Tetractinellid trisenes are well pre- 
served, and there are many rod-like lengths. Many of those are only just 
discernible ; in one part of the section short rows of minute opaque globules 
seem to indicate the position of their spicular canals. The deposit was 
probably rich in silica at this point, for in other parts of the section the 
silica is not in the micro-crystalline condition of ordinary flint, but there is 
also an area in which it shows the fibrous radiating structure of chalcedony. 
Calcareous ooze showing Globigerina now silicified has interpenetrated the 
more siliceous parts. 
Foraminifera. 
The following is a list of the Foraminifera found in the boulders of chalk 
from Belhelvie. I am indebted to Mr A. Earland for their identification. 
