STAURONEIS LEGUMEN EHR.
Valve elliptical-lanceolate, inflated in the middle, with produced sub-capitate or rostrate ends separated by diaphragms. Stauros wide, striated at the margins; axial area very narrow; striæ radiate, about 26 (?) in 10 µ, punctate. L. 28 µ.
Pavonia, N. J., artesian well.
Pl. [39], Fig. 15.
In Cleve's description and Van Heurck's figure, the median inflation is "not larger than the others." In the present form the median inflation is wider.
STAURONEIS ACUTA WM. SM.
Valve rhombic-lanceolate, obtuse; a diaphragm at each end; stauros widened outwards; striæ, 15 or 16 in 10 µ, punctate. L. 130 µ.
Blue clay.
Pl. [27], Fig. 2.
STAURONEIS AMERICANA A. S.