256 OLDER MESOZOIC FLORAS OF UNITED STATES. 
erick; and, secondly, by Mr.S. L. Powell, not far from Utica Mills. Those collected 
by Mr. Powell are from the red shales, and are very abundant. Some of the forms 
resemble nuts; others may be interlacing roots.’ 
T am not aware that anything has been published relative to the dis- 
coveries of either Professor Uhler or Mr. Powell here recorded. 
In the spring of 1890 there were discovered in the red sandstone 
quarries at Seneca, on the Potomac, at the mouth of Seneca Creek, 
Maryland, some very fine specimens of Dendrophycus. The first of 
‘these, and the finest that has been found, was brought to the National 
Museum on May 7 by Mr. D. L. Shoemaker, proprietor of the quarry. 
I recognized it at once and took so deep an interest in it that I visited 
the place a few days later, in company with Mr. Charles S. Prosser, 
and we collected a number of additional specimens. They are well 
marked and typical of this form; but, like all others thus far known, 
are destitute of organic matter or coaly pellicle. They closely resem- 
ble D. Desorti Lx., of the Devonian of Iowa, a fine specimen of which 
is in the collection of the National Museum, but they have the red 
color of the building stone in which they occur. They differ perhaps 
more from the formi found in the Trias at Portland, Connecticut, and 
named by Dr. Newberry D. tréassicus, of which mention has already 
been made. It is, however, interesting to know that this genus 
occurs at two widely separated localities of this formation. 
Important differences exist between these and the Maryland speci- 
mens, differences sufficient to constitute the latter a distinct species. 
I shall therefore call this species Dendrophycus Shoemakert, thereby 
acknowledging Mr. Shoemaker’s kindness in bringing the above- 
mentioned specimen to the Museum, without which act the existence 
of this form in the Maryland deposit might never have been discovered. 
The fine specimen brought by Mr. Shoemaker was carefully photo- 
graphed, under the immediate supervision of Mr. De Lancey W. Gill, 
and the accompanying half-tone illustration shows with great minute- 
ness all the details of structure; and I also had photographs taken of 
the best specimen collected by Mr. Prosser and myself. This last is 
represented on Pl. XXXV, Fig. 2, and by the side of it, Fig. 1, is the 
view of D. triassicus Newb., of Portland, Connecticut, already men- 
tioned (supra, p. 228). Pl. XX XV1is the view of the original specimen 
brought by Mr. Shoemaker, the most complete thus far found. 
The description of the species is as follows: 
DENDROPHYCUS SHOEMAKERI Ward n. sp. 
PL XXXV, Fig. 2; Pl. XXXVI. 
Upper portions of the so-called rhizomes alone present, forming the 
rachis of the frond. Fronds very numerous, covering large areas, 8 to 
1Loc. cit. 
