90 DESCRIPTION OF SPECIES. 



Protophyllum nigosnra, Lesqx. 

 "U. S. Geol. Rep.," vi, p. 105, pi. xvii, figs. 1, 2; pi. xix, fig. 3. 



Among other leaves of this species there is one entirely preserved. 

 No. 747. in the Museum Comp. Zool. Cambridge. It measures 17 centi- 

 meters long, 10 broad, is undulate on the borders or somewhat dentate 

 by the projection of the lateral veins, and agrees in every point by form 

 and nervation with the figure and description of the species (loc. cit.). 



Protophyllum Haydeuii, Lesqx. 

 Ibid., p. 106, pi. xvii, fig. 3. 



Protophyllum crednerioides, Lesqx. 

 Piute II. Figs. 1-3. 

 Hayden's "Ann. Rep," 1874, p. 363, pi. iii, fig. 1 ; viii, fig. 4. 



Leaves small, nearly round, broadly cuneate or subtruncate at base, long-petioled ; 

 borders entire or more generally undulate; nervation obscurely trifid; secondary veins 

 parallel, equidistant, at various angles of divergence, more or less branching. 



The leaves vary in size from 6 to 8 centimeters both ways. The 

 borders are either deeply undulate or nearly entire, though all the nerves 

 and their divisions are craspedodrome ; the secondary nerves are open, at 

 right angles toward the base. The areolation is formed by anastomosing 

 of continuous nervilles at right angles to the veins and by their sub- 

 divisions in the areas, also at right angles, forming very small quadrate 

 meshes, as seen in fig. 3. As in the other species of the genus, the nerva- 

 tion is more or less obscurely trifid. The lower primary lateral nerves 

 being at a distance above the borders have under them, as in Credneria, 

 two pairs of thinner secondary or marginal nerves at right angles. But 

 as the lower veins often branch like the upper ones and have the same 

 direction as those above, the nervation sometimes appears pinnate, as in 

 fig. 1. The ternate disposition is, however, distinct in fig. 3. 



Hab. — Kansas. Not rare. Clis. Sternberg, H, C. Towner. 



Protophyllum? M u d g e i , Lesqx . 



"U. S Geol. Rep.." vi, p. 106, pi. xviii, fig. 3. 



