DESCRIPTION OF THE SPECIES. 231 



dently ranch injured by maceration before it was entombed. Tlie lower 

 purtion of the axis has lost most of its scales, while the upper portion still 

 retains them. These scales, although smaller than those given by Ileer for 

 the species examined by him, appear to more nearly resemble those of Lep- 

 tostrobus than those of any other plant. I place it with doubt in this genus. 

 The cone somewhat resemljles those of Heer,' but the scales are smaller, 

 more numerous, and more closely placed. 



The following seed have the character of the seeds described by Ileer 

 as Samaropsls, from the Jurassic of Ust-Balei, in eastern Siberia." These 

 seeds Heer,^ in subsequent remarks on Leptostrohus, takes to be those of 

 that plant. The Potomac seed throw no additional light on the subject. 

 It is at least significant that they occur with leafy branches that have the 

 character of Leptostrohus. It will perhaps be best to distinguish these 

 Potomac fossil seed as Leptostrobiis (a), (h), etc. 



Seed of Leptostrobus ? {a), sp.? 



Plate CXXXV, Fig. 6. 



Seed smooth, obovate in shape, obtusely rounded at one end, and nar- 

 rowed at the other into a sort of neck ; winged, with wings of the same 

 width, except towards the neck, where it is slightly narrowed. 



Locality: Fishing hut above Dutch Gap Canal. 



Seeds of this nature are sparingly found at this locality. They may 

 be seed of one of the species of Leptostrobus found at Dutch Gap. 



Seed of Leptostrobus ? (6), sp.? 



Plate CXXXVI, Fig. 10. 



Seed broadly elliptical, winged; wing proportionally small and pro- 

 longed at one end into a slight point, widest in the middle, and narrowed 

 slightly towards the extremities of the seed. 



Locality : Fishing hnt above Dutch Gap Canal. 



Winged seed of this nature are found sparingly here. They may be 

 seed of Leptostrobus. 



'Flor. Foss. Arctica, vol. 6, pt. 1, Pl. VII, Fig. 7; PI. VIII, Figs. 1-3. 



- Flor. Foss. Arctica, vol. 4, pt. '2, Beitriige zur Jura-Flora Ostsib. etc., p. 80, et scq. 



^Ibiil., Naclitrag zur Jura-Flora Sibirieus, vol. 6, pt I, p. 23. 



