14 GEOLOGICAL MEMOIRS. 



specimen shows indications of imperfectly developed principal nerves, 

 namely, one in each lateral lobe, and three in the median lobe. 



Fragments of Pecopteris quercifolia, PresL, perfectly correspond 

 with the figure in Count Sternberg's ' Fossil Flora.' One specimen 

 exhibits two pinnulse cohering at their bases, and the indication of 

 a thirdfpinnula. Another showed a considerable number of pinnules, 

 whose chief nerves converge nearly all into one point ; the mode of 

 adherence to a stem or stalk could not be ascertained. Professor 

 Kurr assigns this form to the genns Mattonia, R. Br. 



The figures of Clatliropteris meniscoides, Brongn., with entire mar- 

 gins are incorrect, as the specimens in the Stuttgart Museum show 

 finely dentated margins very distinctly, as in the Liassic species from 

 Fiinfkirchen (Hungary), and in the palmate form from the Rush- 

 sandstone ("Schilf-Sandsteine"), nor is there any difference in the 

 nervation. 



Tceniopteris marantacea is rej)resented by a remarkably fine and 

 complete specimen, 2 feet in length, with well-preserved terminal and 

 lateral lobes. The next two uppermost lateral lobes are almost en- 

 tirely jointed to the terminal one, and the distance between the lobes 

 increases progressively in the lower leaflets. A second specimen, 

 somewhat smaller and less developed, with narrower lobes, presents 

 no trace of nervation. A third specimen, with still narrower lobes, 

 forms a transition to Cycadites Bumjr/l, figured by Mr. Schenk 

 (' Flora of the Keuper,' &c., tab. vi. p. 61). 



The original specimen of Pecopteris Stuttgartensis and many other 

 barren specimens offer not the least trace of nervation. Their primary 

 and secondary petioles, and their pinnulge, are beset with large and 

 apparently irregular excavations, which Professor Ktirr thinks traces 

 of a scaly clothing. No traces of scales appear on the Pecopteris from 

 the sandstones of Lunz (Lower Austria), which has a distinct nerva- 

 tion even when not fructifying, and may be identified with Pecop- 

 teris Meriani, Heer. ; P. rigida, Kurr, is also clothed with scales. 



A complete specimen of Divonites pennceformis, Schenk, shows 

 follicles with a narrow base, and traces of the vascular passages of 

 the leaf-scars in two parallel rows. The part of the follicles above 

 the base seems to have been simple. The pinnulse begin to be 

 apparent only a little farther above, and become more so as they 

 approach the top. 



The specimens of PteropTiyllum are beautiful ; P. Jaegeri may, 

 according to Professor Kurr's figtires, be easily subdivided into the 

 two varieties hrevifolium and longifolium. P. hrevipennce, Kurr, is 

 rather frequent. The rarest species, represented by a unique speci- 

 men, is P. macropJiyllum. [Coitnt M.] 



Attempt at a Geistiral Classieication of the Upper Jurassic 

 Strata. By Dr. W. Waagen. 



[Versvich einer allgemeinen Classification der Schichten des oberen Jura. 

 Munchen, 1865, pp. 31.] 



It is well known that certain beds of the Upper Jurassic series con- 



