146 



length by 12 mm. in width, more or less confluent or decurrent 

 along the rachis, each one provided with a weak midvein. Plate 

 3» Fig. I. 



In grayish sandstone, Florence, Colo. 



AsPLENiUM MAGNUM Knowlton, Monog. U. S. Geol. Surv. 32 : 



667. pi. 7p. /. 5-8 a 



I have figured these specimens for the reason that they show 

 some slight differences or variations from the type figured by 

 Knowlton. In ours the pinnae are more deeply dissected, so 

 that the pinnules are more distinctly separated and are merely 

 confluent close to the rachis. They are also somewhat more 

 pointed and falcate in outline. Plate 4, Figs, i , 2. 



In general appearance they both resemble Aspiduim Kcnnerleyi 

 Newb. (Boston Jour. Nat. Hist. 7:513. 1863; Monog. U. S. 

 Geol. Surv. 35: 11. pi. 16. f. 7,5. 1898), which differs chiefly 

 in the pinnules, for the most part, being finely denticulate near 

 their extremities, although "sometimes entire," according to the 

 description. 



Fig. I in reddish shaly sandstone, Fig. 2 in black carbonaceous 

 shale, Florence, Colo. 



Acrostichum Haddeni sp. no v. 



General form of frond unknown ; pinnae (?) apparently 20 cm. 

 or more in length by about 3 cm. in maximum width, narrowed 

 to acute tips and with coarsely crenulate-serrate margins ; nerva- 

 tion consisting of a series of alternate pinnately arrranged veins, 

 extending from the rachis to the extremities of the serrations, 

 with the spaces between occupied by a network of fine nerves. 

 Plate 4, Figs. 3-6. 



Named for Mr. George Hadden, the collector. 



Figs. 3, 5 and 6 in grayish sandstone, Walsenberg Colo.; Fig. 

 4 in gray shale, F^lorence, Colo. 



Polystichum Hillsianum sp nov. 



General form of frond unknown ; pinnae (?) linear-oblong in 

 outline, about 3 cm. in maximum width, narrowed to 18 mm. at 

 the base, deeply pinnatifid ; pinnules entire, linear to subfalcate 

 in outline, blunt-pointed or obtuse at apex, alternately disposed 

 and confluent along the rachis ; nervation pinnate, consisting of 



