Cyclotella scotica Kuetz.
Podosira hormoides Wm. Sm.
Blue clay. Not rare.
Pl. [1], Fig. 20.
Endochrome in the form of four flaps or patches bound together about a common pyrenoid. In H. subtilis numerous rod-shaped chromatophores lie in a row and are not bound in the centre (Mereschkowsky).
Stephanopyxis Ehr. (1844) em. Grun. (1884)
(stephanos, a crown, and pyxis, a kind of vase or box)
Frustules ellipsoidal, concatenate; valves tumid, of unequal convexity, coarsely areolate, the cells in rows parallel to the longitudinal axis, not radiate, with stray spines or teeth placed concentrically more or less near the margin.
According to Karsten the chromatophores are round or angular discs which lie near the connective zone.
STEPHANOPYXIS TURRIS (GREV.) RALFS