Along the coast.
Pl. [8], Figs. 15 and 16.
GRAMMATOPHORA ISLANDICA EHR.
Frustule oblong; valve elliptical-lanceolate. Septum robust with several undulations and hooked at the end. Pseudoraphe distinct; transverse rows of puncta, 10 in 10 µ.
Reported by Kuetzing in the Atlantic Ocean and by Kain at Belmar, N. J. I have not found it on our coast and I believe, in some cases, it has been confused with G. angulosa var. hamulifera. The figure is drawn from an Iceland form in H. L. Smith T. S., 186.
Pl. [8], Figs. 19 and 20.
Striatella Ag. (1832)
(dim. of stria, referring to the lines on the frustule)
Frustules tabulate, adnate in short, stipitate filaments, scarcely siliceous, divided into partitions, septate or partly so at alternate ends.
STRIATELLA UNIPUNCTATA (LYNG.) AG.