surface of the bone, which envelope the base of the tooth, bnt do not form an integral part of it. The attachment of the teeth in Acrodontosaurus Gardneri is, I suspect, of this kind. The micro- scopic preparations which the British Museum has of Mr. Toulmin Smith's fossils are too few and too imperfect to completely illustrate its histology, but what they do show is piscine rather than rep- tilian.
The minute structure of these Kimmeridge teeth is, I think, rep- tilian rather than piscine. In the characters of their deutine, in the persistence of the upper end of the pulp-cavity and the ossi- fication of the base of the pulp, and in the mode of their attachment these teeth show an approach towards Ichthyosaurus ; but there are also differences, which may not safely be overlooked ; and until new material puts its true nature beyond doubt, I propose to place this fossil by itself, and to call it provisionally Enthelciodon.
January 12, 1870.
John Aitken, Esq., J. P., of Bacup, President of the Manchester Geological Society; Edward Allen, Esq., 19 St. Saviourgate, York ; Clement Cadle, Esq., Gloucester; Arthur Wyatt Edgell, Esq., of Lympstone, Exeter ; Charles F. Leaf, Esq., E.L.S., Old Change, and Harrow; and Samuel Joseph Smith, Esq., 29 Park Boad, New Wandsworth, were elected Bellows of the Society. Professor Otto Torell, of Lund, was also elected a Foreign Correspondent of the Society.
The following communications were read : —
1. On the Geological Position and Geographical Distribution of the Beptilian or Dolomitic Conglomerate of the Bristol Area. By Bobert Etheridge, Esq., E.B.S.E., E.G.S., Bakeontologist to the Geological Survey of Great Britain.
1. Introduction.
2. History.
3. Mode of occurrence.
4. Geographical Distribution of, or Area occupied by the Dolomitic Conglome-
rate.
5. Influence of the Conglomerate upon the production of Minerals.
6. Position in time of the Eeptilian remains with relation to the Conglo- merate.
7. Zoological Contents or Fauna of the Dolomitic Conglomerate.
8. Stratigraphical relation of the Eeptilian Conglomerate to Continental Deposits.
9. Table of Equivalents.
1. Introduction.
It is so long since any communication has been made to the Society upon the Dolomitic Conglomerate in a physical sense, that it ap- peared to me the time had arrived when a paper in our Journal embodying some general notice or history of the conglomerate might not be unacceptable, especially as the Dinosauria of the Trias have
