Auricula insecta (Grun.) Cleve.
"A rare and very curious pelagic species" (Peragallo, Diat. Villefranche).
Prof. H. L. Smith included this form in his first century of "Species Typicæ Diatomacearum," which was issued prior to 1876, the date of publication, in Schmidt's Atlas, of Amphora insecta Grun.
Atlantic City, N. J. Rare.
Pl. [15], Fig. 2.
Scoliotropis CLEVE (1894)
(scolios, twisted, and tropis, a keel)
Frustule linear, oblong. Median line sigmoid near the ends. Valve with transverse costæ alternating with two intermediate rows of puncta in oblique lines.
SCOLIOTROPIS LATESTRIATA VAR. AMPHORA CLEVE
Valve asymmetrical, with the median line curved. Frustule sub-acute at the ends. Median lines not on the same side of each valve of the frustule.