CYMBELLA AMPHICEPHALA NÆGELI
Valve unequally elliptical, with broad, rostrate apices; axial area narrow; median line straight; central area small, rounded; striæ, 12 in 10 µ on the dorsal, closer on the ventral, side and at the ends.
Kirkwood Pond, N. J.
Pl. [18], Fig. 16.
CYMBELLA SINUATA GREG.
Valve linear-elliptical, gibbous on the ventral side; axial area indistinct; central area widened on the ventral side nearly to the margin.
Crum Creek.
Pl. [18], Fig. 13.
Section 2.—Cocconema. Frustules stipitate
CYMBELLA ASPERA (EHR.) CL.