GOEPPERT ON THE FLORA OF THE TRANSITION ROCKS. 19 



remains of Plants have been found. Dr. Goeppert's work com- 

 prises : — 



1. A sketch of the distribution of the " Transition" strata in all 

 parts of the globe. 



2. The Plant-remains of the Transition formation and their state 

 of preservation. 



3. The Transition rocks of Silesia. These require a separate 

 notice on account of the great number of their fossil plants — nearly 

 the half of those hitherto known. 



4. A systematic description of the "Transition" plants. 



5. Palseontological and geological results. 



6. Explanations of the plates, of which forty (4 to and folio), illus- 

 trative of these fossil plants, are already finished. 



The Professor then gives a general view of the species systemati- 

 cally arranged, together with their stratigraphical relations, and the 

 localities where they have been found. This is succeeded by the 

 following geological view of the " Transition" flora, the species being 

 arranged according to the formations. 



I. SILURIAN FORMATION. 



I. Lower Silurian. 



1. Potsdam Sandstone. 

 Scolecolithus linearis*, Haldeman. 



2. Calciferous Sandrock. 



Palaeophycus tubularis, Hall. Buthotrephis antiquata, Hall. 

 irregularis, Hall. 



3. Bird's Eye Limestone. 



Phytopsis tubulosa, Hall. Phytopsis cellulosa, Hall. 



4. Trenton Limestone. 



Palaeophycus rugosus, Hall. Buthotrephis succulenta, Hall. 



simplex, Hall. Sphaerococcites Serra, Sternb. 



Buthotrephis gracilis, Hall. dentatusf, -S/er^iJ. 



5. Utica Slate. 

 Sphenothallus angustifolius, Hall. 



6. Hudson River Group. 



Palaeophycus virgatus, Hall. Sphenothallus latifoJius, Hall. 



Buthotrephis subnodosa, Hall. 



* [See Mr. Logan's Observations on the Scolithus, supra, Part. I. p. 196. Other 

 Canadian Fucoids are mentioned by Mr. Logan, loc. cit. p. 197 (a reticulated 

 form), and p. 203 (a bilobed form). — Transl.J 



t These two species, first described by Adolph Brongniart as Fucoides, were 

 found in limestone strata near Quebec, a district regarded as Trenton Lime- 

 stone by the American geologists, who do not, however, mention these fossils. 

 Perhaps, after all, they are not Plants, but Graptolites, which indeed I think is far 

 from being improbable. [Both are Graptolites. See Geinitz's ' Graptolithen.' — 

 Tkansl.] 



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