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Fig. 132.<br />

Cylindrotheca gracilis.<br />

CYLINDROTHECA. 409<br />

Tribe XVlII.Cylindrothecece.<br />

GENUS 83. CYLINDROTHECA RABH,<br />

1859.<br />

Frustules fusiform, furnished with 2 or 3 lines<br />

(carinae?), arranged spirally, and showing juxta-<br />

posed (carinal ?) dots.<br />

One species.<br />

C. gracilis (Br e b.) Grun. !<br />

{Ceratoneis<br />

Breb. ; Nitzschia Ticnia, IV. Sm. ; Cyhndrotheca<br />

Gerstenbergeri Rab. ; H.V.H. Atl., pi. 80, f. 2*; Type<br />

No. 417), plate 17, fig. 574.<br />

Frustule becoming abruptly fusiform ; spiral line<br />

with 20 to 22 elongated dots in 1 c.d.m. Length,<br />

about 7 to 8 c.d.m.<br />

Freshwater. Brussels (Delogne). Antwerp (H.V.H. ), England<br />

(Ralfs, W. Sm., Comber, Stolt., Norman).

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