762 SYSTEMATIC PALEONTOLOGY 



GLEICHEXIA DELAWARENSIS Berry 

 Plate L, Figs. 5, 6 



Gleichenia delawarensis Berry, 1907, Johns Hopkins Univ. Circ., n. s., No. 



7, p. 82, figs. 3, 3a. 

 Gleichenia delawarensis Berry, 1910, Bull. Torrey Bot. Club, vol. xxxvii, 



p. 20. 



Description. Frond unknown; pinnules subopposite, obovate, 2 mm. 

 to 3 mm. long by 1 mm. to 1.5 mm. wide, attached by their greatly nar- 

 rowed bases to the rather slender rachis ; venation of the Gleiclienia type 

 rather indistinct in most of the pinnules. 



This fragment of a pinna is 27 mm. It is doubtfully referable to 

 Gleiclienia, to which such a large number of fern impressions of Cre- 

 taceous age have been assigned. The most similar among previously 

 described species is, perhaps, Gleiclienia nordenskioldi Heer known from 

 the Kome beds of Greenland, the Dakota of Kansas, and the Knoxville of 

 California, which differs markedly in the shape of the base of the pinnules. 



While a knowledge of the structure or fructification is essential for 

 the conclusive proof of the botanical affinity of fern fragments such as 

 this, it is important for geologists that such characteristic types shall be 

 figured and described in order that they may serve as horizon-makers. 



Occurrence. MAGOTHY FORMATION. Deep Cut, Delaware; Grove 

 Point, Cecil County, Maryland. 



Collection. Maryland Geological Survey. 



GLEICHENIA SAUNDERSII Berry 

 Plate L. Figs. 7-9 



Gleichenia saundersii Berry, 1903, Amer. Nat., vol. xxxvii, p. 679, figs. 1-3. 



Gleichenia saundersii Berry, 1906, Ann. Kept. State Geol. of New Jersey 



for 1905, pp. 139, 141. 



Gleichenia saundersii Berry, 1906, Bull. Torrey Bot. Club, vol. xxxiii, p. 163. 



Description. Pinnules broadly falcate-ovate, entire, bluntly pointed; 

 attached by a wide base, about as wide as the pinnule is long; length 

 4.5 mm. ultimately becoming much smaller, each with a stout mid vein 

 which sends off alternately on each side rather thick veins to the margin, 



