42 C. M. Wheatley on Mesozoic Red Sandstone and 
in the jaws by solid conical fangs.” The whole formation is more- 
over destitute of beds of rock salt and gypsum which characterize 
mineralogically the Permian system, not only in Russia but 
wherever recognized. Sir R, IL. Murchison (Quar. Jour. Geol. Soc., 
Lond., vol. i, p. 82,) says, ‘The Triassic system does not contain 
a single Paleozoie form whether animal or vegetable whilst the 
fauna and flora of the Permian are both so connected with the 
Carboniferous and inferior systems, that they evidently constitute 
the last remnant of the sameera. In the whole geological eri 
therefore, no two systems are more completely separated than 
the Permian and the Trias, the one forming the ‘coiaige? 
Paleozoic stage, the other the base of the Secondary deposits.” 
Prof. Henry D. Rogers in his final Report on the Geology of 
Pennsylvania, vol. ii, part 2, p. 695, says, under the head “Or- 
ganic Remains of Main Red Sandstone belt of Atlantic slope,” 
‘‘ Reptiles,”—‘‘the main formation or that which alone ye 
across Pennsylvania, has thus far disclosed the remains of seve 
ral interesting species: two of these the Clepsisuwrus Pennsylvan- 
icus and eat, were first discovered as already intimated in Penn- 
sylvania : and a species, probably the first named, has been since 
recognized in the Deep River coal field at North Carolina nearly 
a prolongation of the same, by Dr. Emmons, who has added sev- 
eral other species of reptiles as ein to the deposit in North 
Carolina, namely na Palins leosaurus Curolinensis, 
and Palcaosaurus hens Te ee a ersey the formation has dis- 
closed the remains of another reptile of the same general struc- 
ture as the Clepsisaurus; it has been named by Mr, Lea who 
discovered it, the Centemodon sulcatus,” 
rof. Rogers has mistaken the localities, the only Saurian 
bones discovered in Pennsylvania at the date of his remarks 
were, vertebra, ribs, and teeth found in the calcareous conglom- 
erate near Hassacs Creek, upper Milford Township, Lehigh 
county, by Dr. I. Y. Shelley, who presented them to the Acad- 
emy of Natura] Sciences, Phila., Nov., 1847, and upon which Mr. 
ea founded his Clepsisaurus Pennsylvanicus, (Journal Acad. 
Nat. Sci. Phil., Part 3, 1853, page 185, &.); a visit to the local- 
ity by Mr. Lea “ with Dr. Shelley failed to discover the smallest 
indication of further specimens,” and until my discovery of the 
bone bed at Phoenixville in October, 1860, these were the only 
Saurian bones found in the State, with the exception of a portion 
of a rib sent by the writer to Mr. Lea, noticed in Proc, Acad. 
Nat, Sci. Phil., 3 June, cag 
Clepsisaurus "Leai Exam: ns, (Omosaurus perplecus Leidy) Amer- 
ican Geology, part 6, age 81, fig. 51, mentioned by Prof. 
ogers as first discovered un Pennsylvania, has ner yet been recog- 
nized in this State, but was described by Prof. Emmons from 
Saurian bones found in the Dan River Sesh se near Leaksville, 
