52 THE OLDER MESOZOIC FLORA OF VIRGINIA. 



what like that of the pinnules of Cladophlebis ovata, but the nerves of this 

 plant are not immersed in the leaf-substance of the pinnules as those of C. 

 ovata are, and they are very distinct. At the same time the pinnules are 

 united at base and more subquadrate in shape than those of C. ovata. The 

 plant seems to have been more delicate also than C. ovata. 



Cladophlebis microphylla is a good deal like Alethopteris Mexicana, Newb, 

 found at Los Bronces, Sonora, and described by Dr. Newberry in the re- 

 port of Macomb before mentioned. The pinnules of A. Mexicana are more 

 pointed and slender than those of Cladophlebis microphylla. 



Formation and locality. — Found at Clover Hill only, in strata perhaps 

 connected with the upper series of small coal seams. Very rare. 



Cladophlebis pseudowhitbiensis, spec. nov. 

 Plate XXVII, Fig. 4. 



Frond bi- or tripinnate. Principal rachis thick and woody. Ultimate pinnaB 

 alternate, with a rather strong rachis, corded on each side at the insertion of the pin- 

 nules. Pinnules ovate-falcate, acute, separate to the base, and alternate. Nerves not 

 well shown, but apparently as follows : Middle nerves stout at base, and splitting into 

 branches at the summit. Lower lateral nerves twice forked, upper ones forked once, 

 with the upper branch forking again. 



This pretty little plant has its nerves immersed in the leaf-substance of 

 the pinnules, and hence they are not well disclosed. They appear to be as 

 shown in Plate XXVII, Fig. 4 a, which is an enlarged pinnule of Fig. 4. 

 This latter represents what appears to be a portion of a primary pinna 

 which must have had considerable dimensions. It is more like Pecopteris 

 Whitbiensis of the English Oolite than any of the Cladophlebis forms of the 

 Richmond Coal Field, but is evidently not identical with it, unless we follow 

 the custom of some authors who put all plants of this type from the Jurassic, 

 in the species whose type is Pecopteris Whitbiensis. 



Formation and locality. — Found only at Clover Hill, in strata above the 

 main coal seam, and probably associated with the upper series of small coal 

 seams. 



Cladophlebis rotundiloba, spec, nov.? 

 Plate XXVII, Fig. 1. 



Frond? Ultimate pinnse with rounded lobes, which have only their summits 

 free. Nerves slender. Middle nerve branching in a flabellate manner, the branches 



