198 



M, Brongniavt on the different Floras which 



twenty- five sjDecies, and would thus have amounted to more than 

 a hundred, comprising forty-seven Ferns and other acrogenous 

 Cryptogams, and fifty gymnospermous Dicotyledons, thirty-nine 

 of which are Cycadacese and eleven Conifers. 



The essential characters of this epoch are therefore : 1. the 

 great predominance of Cycadacese, already well established, and 

 the presence of numerous genera in this family, especially of 

 Zamites and Nilsonia ; 2. the existence among the Ferns of many 

 genera with reticulated nervation, which scarcely showed them- 

 selves, and only in forms varying little, in the more ancient for- 

 mations, but some of which did nevertheless begin to appear in 

 the epoch of the Keuper. The genera Camptopteris and Thauma- 

 topteris are examples. 



3. Oolitic Epoch. 



Ampliigenous Cryptogams. 

 Alg^. 



Codites difformis, Brong. — Solen- 

 hofen. (Codites serpentinus et 

 crassipes, Sternb.) 



? tortuosiis, Brong. — Solenh. 



(Caulerpites tortuosus, Sternb.) 



Corallinites arbusciUa, Ung. — Au- 

 stria. 



halimeda, Ung. — Austria. 



Choudrites laxus, Sternb. — Solenh. 



lumbricarius, Sternb. — Solenh. 



Sphserococcites cactiforaiis, Sternb. 

 — Solenhofen. 



varius, Sternb. — Solenhofen. 



subarticulatus, Sternb. — Solen- 

 hofen. 



secundus ? Sternb. — Soleidi. 



Schnitzleinii, Sternb. — Solenh. 



cernuus, Sternb. — Solenhofen. 



Stoekii, Brong. — Solenhofen. 



concatenatus, Stern. — Solenh. 



ramulosus. Stern. — Stouesfield. 



ciliatus, Sternb. — Solenhofen. 



Munsteria clavata, Sternb. — Solenh. 



vermicularis, Sternb. — Solenh. 



? lacunosa, Sternb. — Solenh. 



Acrogenous Cryptogams. 

 Ferns. 



Cyclopteris digitata, Brong. — Scar- 

 borough. 



Sphenopteris cysteoides, L. S)- H. — 

 Stonesfield. 



arguta, L. cV H. — Scarboro'. 



crenulata, Brong. — Whitby. 



denticulata, Brong. — Scar- 

 borough. 



Sphenopteris hymenophylloides, 

 Brong. — Wliitb)'. 



Williamsonis, Brong. — Scar- 

 borough. 



Hymenophyllites macrophyllus, 

 Gopp. — Stonesfield, Morestel. 



Pachypteris ovata, Brong. — Whitby. 



lanceolata, Brong. — Whitby. 



microphylla, Brong. — Verdim. 



Coniopteris athyrioides, Brong. — 

 Whitby. 



Murrayaua, Brong. — Scarbo- 

 rough. 



Pecopteris Moretiana, Brong. — Cha- 

 tillon-siu"- Seine. 



Phillipsii, Brong. — Scarboro'. 



denticulata, Brong. — Scarboro'. 



arguta, Brong. — Scarborough. 



serrata, L. Sf H. — Scarboro'. 



Desnoyersii, Brong. — Mamers. 



Reglei, Brong. — Mamers. 



Cladophiebis tenuis, Brong. — 

 Whitby. 



Whitbiensis, Brong. — Whitby. 



dentata, Brong. — Scarboro'. 



ligata, Brong. — Scarborough. 



Williamsonis, Brong. — Scarbo- 

 rough. 



recentior, Brong. — Scarboro'. 



haibiu'nensis, Brong. — Scarbo- 

 rough. 



• lobifolia, Brong. — Scarboro'. 



undulata, Brong. — Scarboro'. 



Tfeniopteris vittata, Brong. — Scar- 

 borough, Hoer, Stonesfield. 



latifolia, Brong. — Stonesfield, 



Scarborough. 



PhyllopterisPhillipsii,Bro»5'. — Scar- 

 ])oroua:h. 



