Valve elliptical-lanceolate, with rounded ends; axial area lanceolate, widened in the middle; striæ, 5 in 10 µ. L. 97 µ. Cape May, N. J. Common. Pl. 25, Fig. 14. Fig. 15, a smaller form, 65 µ in length; striæ, 6 in 10 µ. Fig. 16, 54 µ in length; striæ, 8 in 10 µ (near var. valida Pant.). NAVICULA ELEGANS WM. SM. Valve elliptical-lanceolate, with produced ends; axial area very narrow, central area large, orbicular; striæ strongly divergent in the middle, slightly, if at all, convergent at the ends, curved toward the margin, indistinctly lineate, 9 in 10 µ. L. 95 µ. Blue clay. Not rare. Pl. 31, Fig. 1. _Navicula elegans var. cuspidata Cl._--Valve as in type form but smaller and with rostrate apices; striæ, 10 in 10 µ. L. 82 µ. Belmar, N. J. Pl. 31, Fig. 2. Cleve remarks that the type form is acute and the striæ 9, while the var. cuspidata has 12 striæ in 10 µ. In Fig. 1, Pl. 31, is represented a valve having 9 striæ in 10 µ, but not acute, while Fig. 2, with but slight variation in striæ, is more cuspidate. It is probable there are intermediate variations. NAVICULA PALPEBRALIS BRÉB. Valve elliptical-lanceolate, with acute apiculate ends; axial area broad, lanceolate; striæ radiate, lineate, about 11 in 10 µ. L. 60 µ. Along the coast. Pl. 31, Figs. 6 and 7. On Plate 40, Fig. 5, is represented an abnormal form of Navicula in which the central pores are in a line transverse to the longitudinal axis and each raphe is curved in a line which almost returns to the centre. The puncta are in curved lines radiating from the rounded hyaline centre. Pavonia, N. J., artesian well. Weissflog has described valves of Navicula somewhat similar in punctation. PINNULARIA EHR. (1843) (pinnula, a small feather) Valve linear or nearly so, with rounded ends; axial area broad; central and terminal areas large; costæ smooth, transverse or radiating, usually convergent at the ends.