218 THE POTOMAC OR YOUNGER MESOZOIC FLORA. 



of the tissues and the pressure to which it has been subjected, obliterating 

 the evidences of it. In PI. XCVI, Fig. 1, the main stem shows no jointing, 

 while the ultimate and not fully decorticated twigs do show jointing ; PI. 

 XCV, Figs. 1, 2, 3, .5, retaining epidermis, show good jointing. 



The specimens with buds, as in PI. XCIX, Fig-. 1, had thick fleshy 

 stems, with a comparatively small woody axis, surrounded by a very thick 

 succulent cortical layer. It looks as if this material was provided to sustain 

 the gi'owth of the buds. PI. C, Fig. 1, gives a restoration of wliat was the 

 probable appearance of one of the smaller twigs. Tlie smaller branches 

 seem always to have been spread out in one plane and to have gone off 

 alternately. The tubercles seem to have been borne on the surface of the 

 epidermis. They are never conspicuous on this species, and are seen best 

 on the youngest ultimate twigs, requiring the help of a lens to make them 

 out distinctly. 



The most conspicuous features of this species are the copiousness with 

 which the branching takes place and the shortness and smallness of the 

 branches. The ultimate branches of F. Hohcnegtjeri form usually very long 

 cylinders, which feature is never seen in this species. 



Considering the great nvmiber of specimens found at Fredericksburg, 

 it is most surprising that no trace of it has been found at any other Vir- 

 ginia locality. This gives us a striking instance of the localization of the 

 Potomac plants. This fossil forms a type of Frenelopsis very near to Frenela, 

 and different in many respects from the other known species. 



Frenelopsis parceramosa, sp. nov. 



Plate CXI, Figs. 1-5; Plate CXII, Figs. 1-5; Plate CLXVIII, Fig. 1. 



Tree or shrub; stems and branches originall}^ cylindrical, now found 

 flat from pressure; primary and subordinate branches veiy succulent, 

 jointed, with very short nodes, usuall}- found in a very fragmentary con- 

 dition ; epidermis parchment-like and ver}^ durable, having rows of minute 

 tubercles, wliich form distinctl}^ visible longitudinal lines on the stem ; 

 ultimate branches veiy long with, in the visible portions, but little diminu- 

 tion in the width, from pressure appearing as very narrow, strap shaped 

 twigs, arranged either in an umbellate manner or alternately in one plane, 



