VINE: CAMBRIDGE GREENSAND. 
11 
on the Cambridge Greensand (Quart. Jour. Geol. Soc, Vol. 31, 
pp. 305-313), and the same remarks will apply to the Supplementary 
Notes of the same author (Op. cit., Vol. 33, pp. 485-504). As 
these lists were compiled from Phillips' Geolog-y of Oxford, the 
Memoirs of the Geological Survey of the Cambridge district, and 
from the Catalogue of Collections in the Woodwardian Museum, 
it is only fair to suppose that no Cambridge Greensand Polyzoa was, 
at the time they wrote, known to these respected authors. 
When I wrote the paper already referred to (Cret. Lichen- 
oporidas), I was entirely ignorant of the positive horizon of the 
species described as Lichenopora ijaucipora^ Vine. Immediately 
after the publication, Mr. Thomas Jesson, P.G.S., wrote me a kind 
letter respecting the fossils, and told me that he had sent the forms 
to Professor P. Martin Duncan, F.R.S., about two years previously, 
and that in all probability Professor Duncan had mislaid his letter 
respecting them. In addition to supplying me with the locality of 
the fossils, he offered to place the whole of his Cambridge Greensand 
Polyzoa in my hands if I would work them out. The conditions of 
Mr. Jesson I accepted, and in a paper laid before the Geological 
Society many details of this unique collection were given, both of 
the Polyzoa and of the Foraminifera. In all probability the whole 
of this paper will not be published, and I believe the paragraphs, 
with a list of species described, are all that will be published in the 
Journal of the Society (See Abstracts of the Proceedings of the 
Geological Society, No. 470, pp. 73-74). When asked by Mr. 
Davis to furnish another Palteontological paper to be read before 
the Yorkshire Geological Societj^, and for publication in the yearly 
Proceedings, I promised one on the Cambridge Greensand Polyzoa 
aud Foraminifera, if acceptable. This has been acceeded to, and I 
am glad that Mr Jesson's material is again brought before students 
of British Fossil Polyzoa. As a matter of course I have adhered to 
my former identifications, except in a few instances. These are 
referred to in the text, and the alterations or additions are made after 
mature consideration and still further acquaintance with the subject. 
The collection of Mr. Jesson is a most important one, and its 
description will help to fill up a blank in the hitherto published lists. 
