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MERIDION.<br />

Tribe XIII. Meridione/E.<br />

Frustules and valves cuneate, united in a spiral filament Meridion.<br />

GENUS 63. MERIDION AGARDH., 1824.<br />

Differs from the genus Diatoma by the cuneate form of the valves<br />

and of the frustule in girdle view. Endochrome as in the following<br />

genus.<br />

Fig.<br />

101. Meridion circulare.<br />

This genus ought to be suppressed, but in that case it would be logically<br />

necessary to suppress all cuneate genera, such as Gomphonema, etc.<br />

Wl. circulare Ag. (Ktitz., Baa, pi. 7, f. 16 ; h.v.h. Ati, pi. 51,<br />

f. 10-12* ; Type No. 343), plate 11, fig. 474.<br />

Valves oval, lanceolate, or clavate, with apices rounded, obtuse, showing<br />

transverse costa? rather distant (about 3 in 1 c.d.m.) ; pseudo-raphe indistinct.<br />

Stria? fine, about 16 in 1 c.d.m. Girdle face cuneate, with margins appearing<br />

somewhat undulated by the beginnings of the costre, which terminate<br />

insensibly near the connecting zone. Frustules united in a spiral filament.<br />

Length, 2 "5 c.d.m.<br />

Fresh water. Not very rare. England (Norman), Scotland, Ireland (O'Meara).<br />

347

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