84 THE OLDER MESOZOIO FLORA OF VIRGINIA. 



flat, broad leaf, with longitudinal nerves, and covered with fine punctate 

 dots. It seems to be a fragment of a leaflet of a species like our plant. Its 

 affinity with the Virginia plant is made more probable by the resemblance 

 which many of the plants found in Sonora bear to some of the plants of 

 the Richmond Coal Field. 



Formation and locality. — Not uncommon at Clover Hill in strata asso- 

 ciated with the main coal seam and found only here. I have named the 

 plant in honor of Prof. William B. Rogers, who was the first to call atten- 

 tion to the plants of the Mesozoic of Virginia. 



CYCADE^E. 



CYCADITES, Brongt. 



Cycadites tenuinervis, spec. nov. 



Plate XLIV, Figs. 4 to 6. 



Leaves elliptical-lanceolate or linear-laneeolate. Midrib strong and irregularly 

 striate. Leaflets falcate, acute, closely placed, subopposite or opposite, rather thick 

 and fleshy. Middle nerve very slender and immersed in the parenchyma of the leaflets. 



This plant has been found as yet only in the northern extension of the 

 Richmond Area, in Hanover County, where it occurs with great numbers of 

 Macrotceniopteris magnifolia in a yellowish gray shale which preserves the 

 specimens very poorly. The horizon seems to be about that of the coal- 

 bearing portion of the Richmond Coal Field, and a thin, impure seam of 

 coal is found near the locality of the plants. The nerve of the leaflets is 

 not well disclosed, owing to the thickness of the leaf substance, the poor 

 preservation, and its immersion. Often it can be made out only at the base 

 of the leaflets, as in Figs. 4 and 6. The leaves have been found only in 

 fragments, and appear to have been elliptical-lanceolate or linear-lanceo- 

 late in form. This plant is most strikingly like Cycadites Cutchensis, Feist., 

 from Kukurbit, India, in strata which Feistmantel considers to be of Oolitic 

 age. He gives a representation of his plant in plate xi, figs. 5, 5 a, in 

 " Palaeontologia Indica," series xi, 1. All the details of the two plants are 

 similar, except that the plant from India has its leaflets not so closely placed 

 and rather more obliquely inserted. 



Formation and locality. — Found only in Hanover County, in strata 

 belonging to the horizon of the coal of the Richmond Coal Field. 



