248 THE POTOMAC OR YOUNGER MESOZOIG FLORA. 



Sequoia, species 1 



Plate CXVI, Fig. 7 ; Plate CXXXII, Figs. 2, 5, 6. 



Leafy twigs unknown ; cones rather large; scales deciduous with age, 

 large, wedge-shaped at base, with the free summits shield-shaped, and fur- 

 nished with an umbo; upper portions marked with several furrows, which 

 run longitudinally on the scale and resemble those of the scales of Ghj})- 

 tostrobus. 



Localities: 72d mile-post, near Brooke, not rare; Fredericksburg, 

 very rare. 



These scales, found mostly at the 72d iiiile-post, are not uncommon 

 there. They have a marked character, which makes it easy to recognize 

 them. They are always found in a fragmentary state, only a few scales 

 adhering to the axis and widely diverging, indicating that the scales were 

 quite deciduous and diverged widely on the ripening of the cones. A 

 marked feature is the occurrence of deep furrows on the upper expanded 

 ends of the scales, which possibly indicates some affinit}- with Ghjptostrobus. 

 The shape, too, of the scales resembles that of Sphenoleitidium, so that the 

 type may be a comprehensive one. Plate CXVI, Fig. 7, from Fredericks- 

 burg, shows a portion of a cone compressed logitudinally. 



Sequoia, species 1 



Plate CXXXII, Fig. 10. 



Leafy stems unknown ; cones large : scales wedge-shaped at base 

 and expanded towards the free ends, surface of the free ends of the scales 

 not made out; the upper expanded portions of the scales are marked with 

 longitudinal fun'ows as in the preceding species, and the scales appear to 

 have been deciduous. 



Locality: Fredericksburg. 



Only one cone of this kind was found. It shows the same longitudi- 

 nal plications or fuiTows on the upper portions of the scales as the preced- 

 ing species, but not to such a marked extent, and the cone is considerably 

 larger than any of those found at the 72d mile-post. It evidently forms a 

 distinct species. 



