Maryland Geological Survey 495 



the latter, a thick, vaguely defined, and apparently somewhat succulent 

 midrib exists; petioles proportionally very thick and apparently succu- 

 lent; nervation of the primary order very slender, and with little or no 

 difference in the strength of the primary nerves; reticulation of all 

 orders lax, irregular in shape, and varying in the size of the meshes; 

 ultimate nerves strong, all of equal strength and fern-like. These leaves 

 form an important portion of the angiosperms that occur with a pre- 

 dominant flora of Jurassic type, as at Fredericksburg, and they give 

 a very ancient look to the angiospermous element of the flora." 



Any discussion of ProtecBphyllum must take into account the history 

 of the genus 'ProtorJiipis since the American species have been referred 

 to that genus by Ward and since similar leaves from foreign localities 

 have also been unhesitatingly so identified. 



The genus ProtorMpis was founded by Andrae in 1853 for certain 

 large Liassic forms from Banat in Hungary.'' Subsequently Zigno' 

 described a species from the Oolite of Italy in 1865, JtsTathorst two 

 additional species from the Ehsetic of Sweden ^ in 1878, Heer in 1880 

 a species from the Oolite of Siberia,^ and in 1882 a species from the 

 Barremian of Kome,^ G-reenland. Saporta in 1894 described another 

 Barremian species *^ this time coming from Portugal and another poorly 

 characterized species from the Ehstie of Sweden.'^ Seward records ^ 

 a species from the Wealden of Bernissart, Belgium, and recently Knowl- 

 ton has described still another species from the Kootanie of Montana." 

 Intimately involved with the foregoing is the genus Hausmannia of 



^ Andrae, Foss. fl. Siebenburgens u. d. Banates, Abb. k. k. geol. Reichs., Bd. 

 ii, Ab. iii, 1853, p. 35, pi. viii, fig. 1. 



^ Zigno, PI. Foss. Oolith., i, 1865, p. 180, pi. ix, figs. 2, 2a. 



^Nathorst, Fl. v. Bjuf., i, 1878, p. 42; ii, 1879, p. 57, pi. xl, figs. 2, 4. 



' Heer, Fl. Foss. Arct., Bd. vi, Ab. i, 1880, p. 8, pi. i, fig. 4a. 



= Heer, lUd., Ab. ii, 1880, p. 10, pi. iii, fig. 11. 



"Saporta, Fl. Foss. Portugal, 1894, p. 144, pi. xxii, figs. 9-11; pi. xxvi, figs. 

 17, 18; pi. xxvii, figs. 1-5. 



^ Saporta, IMd., p. 143, pi. xxii, figs. 14, 14a. 



8 Seward, Mem. Mus. d'Hist. Nat. Belg., tome i, 1900, p. 18, pi. iii, fig. 34. 



"Knowlton, Smith. Misc. Coll. (Quart), vol. 1, pt. i, 1907, p. 114, pi. xii, 

 figs. 3, 4. 

 32 



