Pl. [39], Fig. 8.
The smaller forms occur northward, while the larger are found southward. This is unquestionably Bailey's form, as indicated by his figure and by the fact that it is found everywhere along the coast. Wm. Smith's T. punctata is the same species, although the puncta are smaller.
Panduriformes
NITZSCHIA PANDURIFORMIS GREG.
Valve elliptical, constricted in the middle, with sub-cuneate apices; longitudinal fold, with a punctate longitudinal line; striæ transverse and oblique, 15 in 10 µ; keel puncta, 6 in 10 µ. L. 108 µ.
Along the coast. More often found southward.
Pl. [39], Fig. 2.
NITZSCHIA PANDURIFORMIS VAR. MINOR GRUN.
Valve elliptical, constricted in the middle, with cuneate apices; keel puncta, 9 in 10 µ; striæ in transverse and oblique lines about 20 in 10 µ; longitudinal fold bordered by a punctate line. L. 34 µ.
Pavonia, N. J., artesian well.