Pl. [9], Figs. 12 and 13.
LICMOPHORA TINCTA (AG.) GRUN.
Frustules cuneate, narrow, usually found in twos. Valve clavate, hyaline, rather broad at the base; septa moderately deep; pseudoraphe indistinct; striæ, 27 at the base, 30 in the middle and 33 at the apex in 10 µ.
Gomphonema tinctum Ag.
Along the coast. Abundant from about the middle of July to the middle of August.
Pl. [9], Figs. 14 and 15.
LICMOPHORA BAILEYI (EDW.) GRUN.
Frustule broadly cuneate or with convex margins, rarely almost orbicular; valve spatulate or ovate with slender, produced base; septa very deep; pseudoraphe distinct; striæ 20 in 10 µ.
Podosphenia baileyi (Edw.) Lewis.
Long Island Sound and upper coast of New Jersey.