MAEYLAND GEOLOGICAL SURVEY 855 



Family VITACEAE 



Genus CISSITES Heer 

 [Phyll. Cret. Nebr., 1866, p. 19] 



CISSITES FOEMOSUS MAGOTHIENSIS Berry 

 Plate LXXVIII, Fig. 4 



Cissites formosus magothiensis Berry, 1910, Bull. Torrey Bot. Club, vol. 

 xxxvii, p. 25. 



Description. Leaves trilobate, consisting of an elongated terminal lobe 

 and two lateral lobes which diverge from it at angles of about 45. The 

 lobes may be entire or sublobate, with rounded tops, and separated by open 

 rounded sinuses reaching about half-way to the base which is broadly 

 cuneate. Length about 11 cm. to 12 cm. Maximum width, from tip to 

 tip of the lateral lobes, about 9 cm. Margins entire. Midrib stout, 

 becoming thin distad. Lateral primaries supra-basilar, subopposite, 

 thinner than the midrib. Secondaries thin, numerous, camptodrome, 

 except for a craspedodrome one running to the broadly rounded tip of 

 each subordinate lobe. 



Cissites formosus was described by Heer 1 from the Atane beds of West 

 Greenland, and it has been recorded from the Dakota sandstone of the 

 West and the Earitan formation of New Jersey. The present variety 

 differs from the type in lacking the long bifurcated lateral lobes, in the 

 more elongated terminal lobe and the less development of subordinate 

 lobation. It is confined to the Magothy formation of Maryland, but may 

 be compared with Cissites dentato-lobatus Lesquereux of the Dakota 

 group, and Cissites vitifolia Velenovsky of the Cenomanian of Bohemia. 

 All of these forms are probably descended from Cissites parvifolius Berry, 

 which is so common in the Patapsco formation and the Albian of Portugal. 



Occurrence. MAGOTHY FOEMATION. Grove Point, Cecil County. 



Collection. Maryland Geological Survey. 



1 Heer, Fl. Foss. Arct., Bd. vi, Ab. ii, p. 85, pi. xxi, figs. 5-8, 1882. 



