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C03MI0DISCUS. 521
GENUS 184. COSMIODISCUS GREV., 1866.
Valve with hyaline margin, puncta
arranged in radiating rows, interrupted
at various points by hyaline rays ;
centre with scattered puncta.
This genus, which was included in the
Fig. vj^Comiodiscus tenuis. Coscinodiscus by Rattray, deserves in my
opinion to be preserved. The hyaline margin and its rays, equally hyaline and
to he included in it.
distant, easily determines the species which ought
The figure in the text is that of C. tenuis Grun., which is found fossil in
the Monterey deposit.
GENUS 185. -ANISODISCUS GRUN., 1886.
=9
Fig. 275. Anisodiscus Pantocsekii.
Valves circular, furnished with a margin of small distant spines,
difficult to see. The two valves dissimilar ; the superior, with rows
of puncta in distant lines, alternately short and long,
valve with puncta in approximate lines of equal length.
the inferior
This genus only includes a single species, A. Pantocsekii Grim., found in
a fossil state in Hungary, the figure of which is reproduced after Grunow
(fig- 2 75)-