ill!Ill

PSEUDO-EUNOTIA. 305
Desmogonium Guyanense Ehr. (Eul. Spec. Type, No. 151), which
is found in Asia, Africa, and America,
in filaments like the Eunoiia of the
section Himantidium. The valves are inflated at the apices. We have only
noticed terminal nodules on one valve of the specimens in our possession.
Upon the whole, we believe that these two forms ought to be included in
the genus Eunotia, notwithstanding the slight differentiating characters which
separate them from it.
D. Rabenhortstianum Grun. (D. Ins. Banka, p. 6, pi. i,
f. i*; H.L. Sm. Sp., Type No. 129, and Cleve and Mdller, No. 187),
plate 30, fig. 831.
This diatom is found also in long filaments, it has very conspicuous
terminal nodules, valves slightly or not inflated at the apices, and margins with
large beads like the Arfinella. It Eunotia and Actinella.
appears to me to be intermediate between
It is found in the Island of Banka and in China, in fresh water.
Fl S- 68 -
Pseudo-Eutiotia
GENUS 37. PSEUDO-EUNOTIA GRUN.
(1865 and 1882).
Characteristics of Eunotia, from which it is dif-
ferentiated by
Frustules solitary, free.
the absence of terminal nodules.
Ps. Hemicyclus (Ehr.) Grun. (H.V.H. At!.,
pi. 35, f. 23* ; in Types Nos. 262, 275.
Hemicyclus.
Valve narrow, strongly arcuate, with apices inflated obtuse ; transverse
striae obtuse, finely divided transversely,
Fossil. Scotland (Gregory), Sweden (Ehr.).
Fig. 69.
Ceratoneis
A reus.
10-n in 1 c.d.m.
GENUS 38. CERATONEIS EHR., 1840.
Valve arcuate, with apices more or less rostrate- capitate
nodules distinct. Ventral margin generally inflated at the
central portion, showing a very distinct pseudo-nodule.
Pseudo-raphe straight. Frustule free, solitary, with girdle
face linear, narrow.
A sinS le s Pecies -
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