ill!Ill

356
Fig. 106.
Tabellaria fenestrata.
a. Valve view.
b. Girdle view.
TABELLARIA.
B. More than two false septa.
a. Fossil or fresh water forms.
GENUS 68. TABELLARIA EHR., 1839.
Valves inflated at the median portion and at
the apices, striae transverse, but without costae.
Girdle face showing false internal septa, gener-
ally alternate. Frustules united in a zig-zag
filament.
Endochrome granular, with sparse granules.
ANALYSIS OF SPECIES.
r Median inflation much broader than the terminal ;
I Median and terminal inflations equal ;
two
septa
numerous .
to four septa . . T.
T. flocculosa.
fenestrata.
T. fenestrata (Lyng.) Kiitz. (Bac, p. 127, pi. 17, f. 22, etc. ;
H.V.H. Atl., pi. 52, f. 6-8*; Type No. 346), plate 11, fig. 477.
Valve linear, very elongate, strongly inflated at the median portion and at
the apices. Pseudo-raphe narrow, dilated at the inflations. Striae, 10 in
t c.d.m., finely punctate. Girdle face narrow, showing
a small number
(generally two pairs) of false internal septa. Length, about 7 to 10 c.d.m.
Fresh water. Rare. Antwerp, Louvain (P. Gautier). Ard. Lieg. (De Wild.), England
(Kitton, Comber, Brightwell, &c,), Wales, Ireland, and throughout Europe.