174. PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 12, 
surface of the bone, which enyelope the base of the tooth, but 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 dentine, 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 Jchthyosaurus ; 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 Hnthekiodon. 
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, Hsq., Gloucester; Arthur Wyatt Edgell, Esq., of 
Lympstone, Exeter; Charles F. Leaf, Esq., F.L.S., Old Change, and 
Harrow; and Samuel Joseph Smith, Esq., 29 Park Road, New 
Wandsworth, were elected Fellows 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 Guotoctcat Posrrion and GrocrarutcaL Distrreurion of 
the Rupritian ov Dotomiric Conetomerate of the Briston AREA. 
By Rozert Eruurings, Esq., F.R.S.E., F.G.8., Paleeontologist to 
the Geological Survey of Great Britain. 
. Introduction. 
, LebiSOAy, 
. Mode of occurrence. 
. Geographical Distribution of, or Area occupied by the Dolomitic Conglome- 
rate. ; 
Influence of the Conglomerate upon the production of Minerals. 
. Position in time of the Reptilian remains with relation to the Conglo- 
merate. 
. Zoological Contents or Fauna of the Dolomitic Conglomerate. 
. Stratigraphical relation of the Reptilian Conglomerate to Continental 
Deposits. 
. Table of Equivalents. 
1. Inrropvction. 
Oo OI AN Povo 
Tr 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 arriyed 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 
