I'KOOEICDINDS OF GHOLOGICAL SOCIKTHOS. 
.33 
Grocnsaiid near Canibridcjc, now in the Woodward ian Musonm, and in anotiior 
collection ol' fossils I'roiii the Greeusand beds near Kursk in llussia, submittc^d 
to the Prol'essor's exaiuiuaiion by Col. Kipriauoll', there arc teeth of I'oli/pli/nho- 
don, associateci with phisiosauroid vertelmu of the same ])roi)ortioual inagiiitudc, 
and with |_)ortious of larije limb-bones, without raedullary cavity, and ot' 
plesiosauroid shape. 
Thus the evidence at present obtained respecting this huge, but hitherto 
problematical, carnivorous Saurian of the Cretaceous period seemed to prove 
it to be a n\;u'ine one, more closely adlicring to the prevailhig type of the Sca- 
lizards of the great mesoiioic epoch, theu drawing to its close, than to the Mom- 
m/irux of the Upper Chalk, which, by its vertebral, palatal, and dental charac- 
ters, seemed to foreshadow the Saurian type to follow. 
Professor Owen exhibited also drawings of specimens in the Woodwardian 
Museum and in the collection of Mr. W. Harris, of Charing, which show the 
mode and degree of use or abrasion to which the teeth of Polyptychodon had 
been subject. 
2. " On some Fossils from near Bahia, South America." By S. Allport, 
Esq. Communicated by Professor Morris, F.G.S. 
The south-west point of the hill on which the Fort of Montserrate is built, 
in Bahia Bay, exliibits a section of alternating beds of conglomerate, sandstone, 
and shale ; in the last Mr. Allport discovered a large Dinosauriau dorsal verte- 
bra, not unlike that of Megalomurus, several Crocodilian teeth, and numerous 
large scales of Lepidotus, together with a few MoUuscs [Pcdudina, Unio, &e.), 
some Entomostraca, aud Liguite. Two miles from Montserrate, in a N.E. 
direction, is the Plantaforma, another hill of the same formation, but loftier. 
The shales here also yielded similar fossils. 
These fossiliferous shales aud couglomerates dip to the N.W. towards the 
Bay, aud appear to overlie a similarly incliued whitish sandstone, wliich rests 
against the gueissosc hiUs ranging north-easterly from the point of St. Antonio. 
3. " Ou a Terrestrial Mollusc, a Chilognathous Myriapod, and some new 
species of Reptiles, from the Coal-formatian of Nova Scotia." By J. W. 
Dawson, L.L.D., F.G.S., &c. 
Ou revisiting the South loggings in the past summer. Dr. Dawson had the 
opportunity of examiuiug the interior of another erect tree in the same bed 
which had afforded the fossil stump from which the remains of Deiidrerpetoii 
Acadianum and other terrestrial arumals were obtained in 1851 by Sk C. Lyell 
and himself. This second trunk was about fifteen inches in diameter, and was 
much more ricldy stored with animal remains than that previously met with. 
There were here numerous specimens of the laud-shell found in the tree pre- 
viously discovered in this bed — several individuals of an articulated animal, pro- 
bably a Myriapod — portions of two skeletons of Dendrerpeton — and seven 
small skeletons belonging to another Reptilian genus, and probably to three 
species. 
The bottom of the trunk was floored with a tliin layer of carbonized bark. 
On this was a bed of fragments of mineral charcoal (having Sigillaroid cell- 
structure), an inch thick, with a few Reptilian bones aud a Stenibergia-ca.'Al. 
Above tliis, the trunk was occupied, to a height of about six inches, with a 
hard black laminated material, consisting of fine sand and carbonized vegetable 
matter, cemented by carbonate of lime. In this occurred most of the animal 
remains, with coprolites, and with leaves of Noeggerathia (Poacites), Carpo- 
lithos, and Calamites, also many small pieces of mineral charcoal, showing the 
structures of Lepidodeiidron, Stigmaria, and the leaf-stalks of Ferns. The 
upper part of this carbonaceous mass alternated with fine grey sandstone, which 
filled the remainder of the trunk as far as seen. Tlie author remarked that 
tills tree, like other erect Sigillarue in this section, became hollow by decay, 
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