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The Diatomaceæ of Philadelphia and Vicinity
Charles S. Boyer
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Pl. 7, Fig. 11, and Pl. 10, Fig. 15.
I am unable to distinguish between E. læve and E. debile, as intermediate forms occur.
{34} Terpsinoë Ehr.(terpsinoos, gladdening?)
Frustules quadrangular, adnate in filaments, usually free. Valve elliptical or triangular, with undulating sides divided by septa into three or more sections.
TERPSINOÃ AMERICANA (BAIL.) RALFS
Valve lobed at each end or angle. Central space rounded, hyaline. Surface with fine puncta in radiating lines.
Blue clay. Not common.
Pl. 6, Fig. 10.
TERPSINOÃ NOVÃ-CÃSAREÃ BOYER
Valve triangular, with concave sides and broad angles equally three-lobed, separated from the central part by septa. Central space small or absent. Puncta delicate, radiating or scattered. . . . Read More
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