Maeyland Geological Survey 467 



Venation palmate from at or near the base. Midrib slender, somewnat 

 jflexuous. Lateral primaries three to five pairs, spreading at acute angles, 

 ultimately camptodrome by curving inward to join secondary branches 

 of the next within primary. 



This species is very close to the later species which have been referred 

 to Menispermites but it is clearly distinct from any of these. It is also 

 separated by well-marked characters from the Potomac species of Nelum- 

 bites which resemble it in a general way. 



Occurrence. — Patapsco Formation. Stump Neck, Maryland; Wide- 

 water, Virginia. 



Collection. — Johns Hopkins University. 



Order SAPINDALES 

 . Family SAPINDACEAE 



Genus SAPINDOPSIS Fontaine 

 [Mon. U. S. Geol. Survey, vol. xv, 1890, p. 296] 



"Leaves pinnate, both odd piimate and abruptly pinnate; terminal 

 leaves usually more or less united at base; upper pairs of leaves decur- 

 rent, forming a wing on the common stem, the wing lessening in width 

 on the pairs in descending; leaves mostly opposite in pairs, sometimes 

 subopposite; the lowest pairs lack the wing, and are sometimes short- 

 petioled; leaves thick, with dense and often glossy epidermis, elliptical 

 or lancet-shaped, with a strong prominent midrib, which extends with 

 slight diminution to the tip of the leaf ; lateral nerves going off at a large 

 angle, and uniting more or less completely near the margin to form a 

 series of arches; the lateral or primary nerves, as seen on the lower 

 side of the leaves, strong and prominent, but on the upper side, owing 

 to the thickness of the leaves, generally indistinct; the ultimate reticula- 

 tion is strong, and forms a series of rather large, irregular, polygonal 

 meshes." — Fontaine, 1890. 



This curious genus forms an important element in the flora of the 

 Patapsco formation to which it is strictly confined with the single excep- 

 tion that S. variabilis has been recorded in the nearly homotaxial Fuson 



