Frustules with numerous bent septa extending the entire length. Valve lanceolate, somewhat unsymmetrical, subtly punctate, with pseudoraphe quite distinct.
"The specific name is derived from the appearance of the endochrome which in the living specimen is invariably collected in a central mass with slender threads radiating in all directions toward the cell-wall" (Wm. Sm.). Pyrenoids cuneate, in the centre of the endochrome, numerous.
Long Island Sound and along the coast.
Pl. [8], Figs. 22 and 23.
STRIATELLA INTERRUPTA (EHR.) HEIB.
Frustules quadrangular, with robust alternate septa extending to the middle. Puncta in quincunx, 22 in 10 µ.
Tessella interrupta Ehr.
Very rare along the coast.
Pl. [8], Fig. 24. (From a form found at Stonington, Conn.)