Translation 2816

38
2. Cells have the shape of a truncated double cone. Apex
without apiculi. Cells are circular in cross section,
transverse groove is circular. Measurements: 40 -41 x 25-26A.
G. austriacum 37.
3. The epivalve is arcuately conical with 2 apiculi, while
the hypovalve is rounded in the manner of a wide trapezoid
and slightly sinuous at the antapical end. Cells measure
40-45 x 34-38/.4. , and are very slightly flattened.
G. latum 38.
) Epivalve larger than hypovalve.
Cells are oblong oval, circular in cross section. Epivalve is
half-ovoid, hypovalve hemispherical. Transverse groove is exactly
circular. Cells are 32-35 x )5-36 /4,
G. mitratum
II. Small forms (length 9-25/1).
(a) Epivalve and hypovalve hemispherical, dircular in cross section.
• . Cells measure 18-22 x 16-18 /q. G. eurytopum 40.
(b) The epivalve is truncatedly conical, with convex sides, the
hypovalve spherical. Longitudinal groove is indistinct. Cell
color is glossy silver-grey. Cell measures 14 x
• G. Lantzischil, 41 •
(c) The epivalve is hemispherical, pileiform , higher and broader
than the hypovalve, which is likewise hemispherical. Cell
measures 11 x 8.8m. Halophilous G. fungiforme 42.
(d) The epivalve is hemispherical to half-ovoid, and as wide as
hypovalve, which is hemispherical, symmetri-
or wider than, the