642 PROCEEDINGS OF THE NATIONAL UUSEUM. vol.38. 



. ; 



it is the most abundant species found, just as it is at White House 



Bluff, Brooke, and Aquia Creek, Virginia, and at Fort Foote, Mary- 

 land. 



It is an exceedingly variable form in all its details, and as during 

 maceration the most variable apical portion is the last to be destroyed 

 this variability is emphasized in fragmentary material such as that 

 usually collected. When well preserved it furnishes most character- 

 istic specimens. In life its rigid pinnate leaves and strict appear- 

 ance must have given it a very striking aspect. 



Occurrence. — Patapsco formation. Fort Foote (over 100 speci- 

 mens), Prince George County, Maryland; near Brooke, White House 

 Bluff, Mount Vernon, 72d milepost, Aquia Creek, and near Wide- 

 water, Virginia. — Fuson formation. Oak Creek, Wyoming (abun- 

 dant at all of the foregoing localities). 



( 'ottections. — U. S. National Museum, Johns Hopkins University. 



SAPINDOPSIS MAGNIFOLIA Fontaine emend. 



Sapindopsis magnifolia Fontaine, Monogr. U. S. Geol. Surv., No. 15, 1890, ]>. 297, 



pi. 151. figs. 2, :',- pi. 152. figs. 2, 3; pi. 153, fig. 2; pi. 154, figs. 1, 5; pi. 155, 



lig. 6. — Fontaine, in Ward, Monogr. U. S. Geol. Surv., No. 48, 1905, pp. 



181, 482, 528. 

 lAralia dubia Fontaine, Monogr. U. S. Geol. Surv., No. 15, 1890, p. 314, pi. 157. 



figs. 1. 7 (not Schimper, 1874). 

 Ficophyllum eucalyptoides Fontaine. Monogr. U. S. Geol. Surv.. No. 15, 1890, 



p. 291, pi. 164, figs. 1, 2. 

 Sapindopsis tenuinervis Fontaine, Monogr. F. S. Geol. Surv., No. 15, is<i(), p. 



:'.()! . pi. L53, %. 1. — Fontaine, in Ward, Monogr. U. S. Geol. Surv., No. 48, 



L906, pp. 489. 528. 

 ? Arabia fontainei Kxowlton, Bull. No. 152, U. S. Geol. Surv., 1898, p. 2>7. 

 Sapindopsis obtusifdlia Fontaine, 1890, Monogr. U. S. Geol. Surv.. No. 15, 18^0. 



1». 301, pi. 15(1. fig. L3; pi. L59, figs. 3-6. 

 Ficophyllum eucalyptoides Fontaine, in Ward, Monogr. I'. S. Geol. Surv.. No. 48, 



1906, p. 489. 



Description. — Leaves commonly odd pinnate, although occasional 

 abruptly pinnate forms occur, of considerable size, but somewhat 

 \ ariable, however, in this respect. Leaflets 3 pairs, comparatively 

 large, Lanceolate, tapering almost equally toward the apex and base, 

 the latter inequilateral except in the terminal leaflets, pointed, often 

 lacking apical portions, length increasing proximad, averaging about 

 10 cm., longest seen 14 cm. (estimated), shortest 5 cm., width vary- 

 ing from 1.1 to 3.2 cm., inequilateral, since the outer half of the lamina 

 is broader than the inner half and is markedly decurrent. This 

 feature is least emphasized in the basal leaves which may even have 

 ;; considerable petiole, but becomes increasingly pronounced distad, 

 the terminal leaflets often forming a bilobate or trilobate whole with 

 the outer margins broadly decurrent and joining the lamina of the 

 leaflet next below at the point of juncture of its inner margin with 



