(named after Thomas Atthey)
Frustules quadrangular, tabulate, with numerous annuli. Valve elliptical-lanceolate, with a pseudoraphe and a central punctum. Extending from each end is a strong spine half as long as the valve.
ATTHEYA DECORA WEST
The only species. Diagnosis of the genus. The valves are imperfectly siliceous, scarcely visible in balsam.
Very local. Abundant at Shark River, N. J.
Pl. [8], Fig. 25.
(b) MERIDIONEÆ
Valve symmetrical in zone and valve view along the sagittal line, but asymmetrical to the transverse axis, cuneate. In zone view sometimes with wedge-shaped septa. Valve finely striated, without central and usually without terminal nodules; a pseudoraphe present.
Licmophora.—Frustules cuneate in stipitate fan-shaped fascicles.
Meridion.—Frustules cuneate in spiral fascicles.