316 



THE GEOLOGIST. 



2. Brachycephalic, 



a. Superciliaries large, 

 j Plan. 

 I Montrose. 

 1 b. Superciliaries small. 

 1^ Etruria, O. 



Chaeles Caetee Blake. 



Fossils feom Teeflach Quaeey. — Dear Sir, — In the bed of shale 

 above the mountain limestone of the Treflach Quarries, I found two fossils 

 which I find figured in Phillips's Manual as Gryphcea incurva, Lias foss., 

 and G. cymhium, Lower Oolite foss. Can you, or an)^ of your readers, 

 account for it ? — Yours truly, H. M. G. Wythim, Whittinyton, Oswestry, 

 27th June. 



Shares' Teeth at Panama. — The Miocene deposits at Monkey Hill, 

 near Panama, have afforded to the geological labours of W. Dupree, Esq., 

 M.D., F.E.G.S., three sharks' teeth, as well as various species of fossil 

 shells. The sharks' teeth belong to the Carcharodon megalodon, Agass. ; 

 Semi/pristis serra, Agass. ; and a species of Lamna, or Porbeagle. 



The Carcharodon teeth are rather smaller than the average of English 

 specimens from the Hed 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 Lajnna with any known species. In the breadth 

 of its base it differs from any tooth I have seen, and the section accords 

 with none of those in the I3ritish Museum, or in Agassiz' ' Poissons 

 Fossiles.' 



The specific name of euryhathrodon, from evpvs, broad, and ^adpov, 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. — Chaeles Caetee 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 hmestone (Lower Carboniferous) containing Spirifera bisulcata, 

 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 (k ingle), and so hard and compact as to approach quartzite of a 

 highly crystalline character, while iron pyrites are difiused through the 

 strata in streaks. 



At about 40 fathoms a band of marine fossils occurs, partly in the shale 

 and partly in clay-ironstone nodules accompanying it : these consist of 

 Act'niocr'niHs crassus and other crinoids, several species of Productus and 

 ( i\l nci'/opecten, — A. arenosus, A. granosus, etc. 



trip-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 

 eflbcts 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. 



