DESCRIPTION OF SPECIES. 91 



Undetermined Cones. 

 Plate XL VII, Fig. 3; Plate XL VIII, Fig. 1. 



I have here given two figures of what appear to be cones of some 

 conifer which had elongate spindle-shaped cones. A group of three of these 

 was found on a small fragment of argillaceous flaggy sandstone at Clover 

 Hill. They were all fragmentary and very poorly preserved. I have fig- 

 ured the two most distinct specimens. Fir cones six inches long are reported 

 from the Mesozoic strata at Phcenixville, Pa. I have never seen them. 

 They may be the same with the cones now in question, or nearly allied to 

 them. 



Undetermined Stem. 

 Plate XLVIII, Fig. 5. 



I have given in Plate XLVIII, Fig. 5, a representation of the markings 

 made by a portion of the exterior of some stem. It appears to be the stem 

 of a cycad, somewhat like that drawn by Williamson in his article on the 

 history of Zamia gigas, Trans. Linn. Soc, vol. xxvi, plate 53, fig. 5. This 

 fossil is held by Williamson to be the stem of Zamia gigas, Lindl. and Hutt , 

 from the Oolite of England. Williamson gives in fig. 5, plate 53, the scars 

 left by the bases of the leaves on this stem. They are raised and rhomboid 

 to elliptical in shape, and have the greater length in the direction of the 

 axis of the stem, being surrounded by a deep depression. The scars are 

 arranged in quincunx. The impressions of the scars left by the plant now 

 in question are a good deal like these in their general shape, and in having 

 their larger axis apparently turned in the direction of the length of the 

 stem and not^transverse to it, as in the stem of most cycads. These scars 

 are depressed, and have the marks of a vascular bundle at their upper end. 

 They have a resemblance to Lepidodendron scars. The stem may possibly 

 have been that of a conifer. Fig. ha gives one of the scars magnified. 

 The border of the scar is raised, forming a ridge. 



