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4io<br />

CRYPTO-RAPHIDIE/E.<br />

SUB-FAMILY III. CRYPTO-RAPHIDIE^E.<br />

Frustules with<br />

valve face gen-<br />

erally<br />

subcircular,<br />

angular,<br />

circular,<br />

or<br />

more<br />

rarely elliptic,<br />

oval, or bac<strong>ill</strong>ar.<br />

frequently<br />

never<br />

r<br />

i with<br />

1<br />

much developed in<br />

view and filamentous ;<br />

girdle<br />

or<br />

with processes, teeth, spines,<br />

or awns ;<br />

or<br />

more or less hyaline ;<br />

irregular ;<br />

or<br />

or<br />

furnished with transverse<br />

costae in girdle view.<br />

a central linear blank<br />

(hyaline) space<br />

raphe<br />

on the valves.<br />

or a true<br />

All the crypto-raphidiese have a granular endochrome ;<br />

cylindrical forms the granules<br />

in<br />

are scattered on the internal<br />

surface of the valves ; in discoid or analogous forms the<br />

granules radiate round a central point.

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