DESCRIPTIONS OF SPECIES. 31 



it may be distinguished by its smaller size, less number of folds, and some- 

 what shorter spike of the petiole. Sabal Grayanus Lesq., is larger, with nearly 

 double the amount of rays and a keeled petiole. Sabal grandifolia Newb. is 

 much larger and like S. Grayanus has twice as many folds. These large 

 species may be distinguished from each other by the concavely pointed and 

 keeled petiole of S. Grayanus. 



In the figures given, that on PL LXIII, fig. 6, represents the under side 

 of the leaf at its base, showing pointed spike formed by the prolongation 

 of the petiole. PL LXIV, fig. 1, represents the summit of the petiole and 

 base of the leaf on the upper side. Here the rays are inserted on either 

 side of a nearly symmetrical angle of the petiole, but other specimens show 

 that the line of insertion of the rays is sometimes obliquely arched, precisely 

 as in the figure of the base of the leaf of Sabal grandifolia, shown in fig. 

 2, PL LXIV. Fig. la of the same plate represents two folds of the leaf of 

 Sabal Powelli, given of the natural size, to show the nervation. 



Formation and locality: Tertiary (Green River group). Green River 

 Station, Wyoming. 



Manicaria Haydenii Newb. 

 PL LXIV, fig. 3. 

 Proc. U. S. Nat. Mus., Vol. V (March 21, 1883), p. 504. 



"Frond large, leaves pinnately plicated, folds \\ centimeters in width 

 above, slightly narrowed below; flat or gently arched, smooth, springing 

 from the midrib at an angle of 25 degrees above, 30 deg-rees below (in the 

 specimens figured); folds attached to the midrib obliquely by the entire 

 width, and to each other by their entire length (!); nervation fine, uniform 

 (?), parallel." 



The specimen figured is only a small portion of an entire leaf, and is 

 inadequate to supply material for a satisfactory description. It is, however, 

 evidently the central portion of a palm leaf of which the general form was 

 elongated and the length probably man}^ times the breadth. It was com- 

 posed of a large number of pinnate, united, flattened folds, divergent from 

 the midrib at an acute angle. These folds were not keeled like those of 

 Flabellaria and Sabal, but either plain or gently arched; whether they were 

 united throughout their entire length or were free toward the margin of the 

 leaf is not certainly known, as we have nowhere seen the entire breadth of 



