Geological Notices by Dr. Morton. 277 
Carcharias canceolatus, (Pl. x1, fig. 3 and 5.*) 
megalotis, (Pl. x1, fig. 4.) 
polygurus, (PI. xu, fig. 2.) 
Galeus pristodontus, (PI. xz, fig. 6.) 
Lamna acuminata, (PI. x1, fig. 11.) 
——— Mantelli, (Pl. x1, fig. 4.) 
—— lanceolata, (Pl. x1, fig. 5.) 
——— plicata, (Pl. x1, fig. 2 and 3.) 
All these species are found in Europe; and three of them, viz. 
Galeus pristodontus, Lamna acuminata and L. Mantelli, have heen 
obtained by Mr. Mantell, in the Chalk of Lewes in Sussex, Eng- 
land. Nor does the analogy stop here ; for the same chalk contains 
the Saurocephalus lanciformis and S. Leanus of the United States ! 
But Mr. Mantell adds that the latter two are not Saurians, as their 
discoverers supposed, but fishes. 
Again, Mr. Conrad discovered at Erie, Alabama, a thin stratum 
of a strongly argillaceous clay, in every respect resembling the Galt 
of England. You will recollect that the English Galt is embraced 
in the ferriginous sand, and that its characteristic fossil is the 
Inoceramus sulcatus. 'The mineralogical characters of the Galt of 
Alabama are the same as those of the European variety ; it is al- 
so immediately connected with the green sand, and moreover con- 
tains a species of Inoceramus. 'The specific characters of the latter 
are scarcely available from the solitary castin my possession, (which 
is imbedded in the Galt) but it is obviously different from the I. sul- 
catus. ‘Thus every day unfolds new analogies between the cretace- 
ous deposits of Europe and America. 
I take this occasion to remark, that I think our cretaceous strata 
may be safely referred to three divisions, of different ages, viz. the 
upper, the medial, and the lower. ‘The upper division has been par~ 
ticularly and exclusively examined by Mr. Conrad, who observed it 
near Monk’s corner, thirty miles north of Charleston, S. C. and ex- 
tending thence to near Charleston, and north to Vance’s ferry. Its 
characteristic fossils appear to be Pecten membranosus, ‘Terebratula 
lacryma, Ostrea cretacea, O. panda, and Echinus infulatus. ‘This di- 
vision is also admirably exposed in many parts of West Florida, and 
the southern section of Alabama, embracing the Nummulite Lime- 
stone from Claiborne to St. Stephens. Its characteristic fossils in 
* The references are given for the convenience of persons who possess the Sy- 
nopsis, asno attempt was made in the latter to identify more than one or two spe- 
cies of the many teeth of fishes there figured. 
