Maryland Geological Survey 481 



secondary nerves camptodrome, delicate^, curving forward, forking and 

 anastomosing midway between the midrib and the margin, the branches 

 forming festoons along the margins." — Ward, 1906. 



This species shows some points of resemblance to CelastropJiyllum 

 acutidens Fontaine, which is, however, a coarser and more ovate leaf 

 with much larger and more irregular teeth. It also is much like Celas- 

 trophyllum Eunteri Ward, a relatively narrow and more elongated leaf. 

 It is very similar to C elastropliyllum Brittonianum Hollick, differing in 

 being widest below instead of above the middle, in having more prominent 

 marginal teeth which are crenate instead of denticulate, and in the less 

 numerous, more ascending, and earlier forked secondaries. Like the 

 latter species it survives into the Upper Cretaceous Tuscaloosa formation 

 of Western Alabama. 



Occurrence. — Patapsco Formation. White House Bluff, Virginia. 



Collection. — U. S. ISTational Museum. 



Order RHAMNALES 



Family VITACEAE 



Genus CISSITES Heer 

 [Phyll. Cret. d. Nebraska, 1866, p. 19] 



This genus was instituted by Heer in 1866 for the species Cissites 

 insignis from the Dakota Group, a tri-lobate, tri-veined leaf with sublo- 

 bate lobes, which presented various points of affinity with the genus 

 Cissus of Linne. Subsequent authors included a variety of leaves in this 

 genus some of which are more or less suggestive of Sassafras, Platanus, 

 etc. 



The genus makes its appearance in the Patapsco formation of Mary- 

 land and in the Albian of Portugal and is largely developed in later 

 Cretaceous deposits, Lesquereux enumerating no less than seventeen 

 species from the Dakota Group of the West, one of which succeeded in 

 migrating as far as the southern part of South America according to 

 Kurtz.^ Cissites is much less prominent in the Karitan formation. It 



"■ Kurtz, Revista Mus. La Plata, vol. x, 1902, p. 54. 



