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CH/ETOCEROS. 4-1<br />

Sub-genus I. Ch.et/OCEROS. Valves elliptic, with awns not<br />

arranged in a circle on the margin<br />

Fig- 139. .<br />

Frustules closely united .<br />

Chcetoceros<br />

of the valve.<br />

a. b.<br />

Wighamii. b. Chcetoceros Lorenzianus.<br />

ANALYSIS OF SPECIES.<br />

. . . . . ch.<br />

C Apertures very large, suborbicular ; valves<br />

i Frustules leaving horns straight or very slightly curved .<br />

apertures between -J<br />

one another. j Apertures<br />

longly elliptic, lanceolate ; horns curved<br />

I. in the direction of minor axis . . Ch.<br />

armatum.<br />

with<br />

Ch, Wighamii,<br />

paradoxum<br />

var. Eibenii.<br />

Ch. armatum, West. (T.M.S., i860, viii., p. 151, pi. 7, f. i 2;<br />

H.V.H. Atl., pi. 81, f. 1-4* Type No. 446), plate 18, fig. 603.

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