Pl. [30], Fig. 10.
Capitatæ
PINNULARIA MESOLEPTA EHR.
Valve linear, with triundulate margins and capitate ends; axial area narrow, widened in the middle; striæ divergent in the middle, convergent at the ends, about 12 in 10 µ. L. 34 µ.
Common in fresh water.
Pl. [29], Fig. 13.
PINNULARIA MESOLEPTA VAR. STAURONEIFORMIS GRUN.
Valve triundulate, capitate; axial area narrow, widened in the middle to a transverse fascia, broader at the margin; striæ strongly divergent in the middle and convergent at the ends, 9-10 in 10 µ. L. 70 µ.
Pavonia, N. J., artesian well. Fresh water.
Pl. [30], Fig. 20.