316 
THE GEOLOGIST. 
2. Biachvcephalic. 
/ a. Superciliaries larse. 
>IaH. 
I Montrose. 
b. Superciliaries small. 
\ Etniria, 0. 
Charles Caeter Blake. 
Fossils from Tbeflach Quarry. — Dear Sir, — lu tlie bed of shale 
above the mountain limestone of the Treflach Quarries, I found two fossils 
•n hich I find figured in Phillips's Manual as Gryphcea incurva. Lias foss., 
and G. ci/mhium, Lower Oolite foss. Can you, or any of your readers, 
account ibr it ? — Yours truly, H. M. G. Wtthim, Whittington, Oswestry, 
27th June. 
Sharks' Teeth at Panama. — The Miocene deposits at Monkey Hill, 
near Panama, have afforded to the geological labours of W. Dupree, Esq., 
M.D., P.E.G.S., three sharks' teeth, as well as various species of fossil 
shells. The sharks' teeth belong to the Carcharodon megalodon, Agass. ; 
Semipristis serra, Agass. ; and a species of Lamyia, or Porbeagle. 
The Carcharodon teeth are rather smaller than the average of English 
specimens from thePed Crag ; the Hemipristis are in no way distinct from 
the remains which are found in the " molasse " of Switzerland, Piedmont, 
and Germany. 
I have not identified the Lamna with any known species. In the breadth 
of its base it differs from any tootli I have seen, and the section accords 
with none of those in the British Museum, or in Agassiz' ' Poissons 
Eossiles.' 
The specific name of eu}\i/hathrodon , from elpis, broad, and jSadpuv, base, 
might be proposed, but it would be very injudicious to found a species on 
one solitary tooth. It_ is apparently the second tooth in the under jaw, 
and the teeth which were associated with it in the same jaw might be 
identified with those of known fossil species. The specimens are now de- 
posited in the British Museum. — Charles Carter Blake. 
Bituminous Sandstone. — A bituminous sandstone, (of which a speci- 
men has been transmitted to the Editor) has been found in sinking a shaft 
in an ironstone pit near Hogganfield, 3 miles eastward from Glasgow. 
It occurs at the depth of about 50 fathoms, and is 3 feet in thickness ; 
being overlaid by successive bituminous shales, thin sandstone beds, lime- 
stones, etc. 
The limestone (Lower Carboniferous) containing Spirifera hisulcata, 
and other fossils, is indurated to an extent equal to compact greenstone ; 
the shales have lost their schistose character, being quite friable or in a 
state of dry clay, having been deprived more or less of their original colour 
and assuming the appearance of fire-clays ; the sandstone beds are greatly 
indurated (kingle), and so hard and compact as to approach quartzite of a 
highly crystalline character, while iron pyrites are diffused through the 
strata in streaks. 
At about 40 fathoms a band of marine fossils occurs, partly in the shale 
and partly in cla3'-ironstone nodules accompanying it ; these consist of 
Actinocrimis crassus and other crinoids, several species of Productus and 
A viculopecteji, — A. arenosus, A. granosus, etc. 
jS'o trap-dykes or overflows are found in such close proximity as to 
make one suppose them to be the direct agents in these results, and these 
effects must have been caused by heated gaseous bodies, or steam, in 
a similar manner as a thick coal-seam at Cambuslang, near Glasgow, has 
been found completely coked by the same agency. 
