TRANSACTIONS. 
Descriptions of New and Eare Diatoms. Series XII. 
By E. K. Greville, LL.D., F.R.S.E., &c. 
(Communicated by F. C. S. Roper, F.L.S.) 
(Read Eeb. lOtli, 1864.) 
(Plates X & XI.) 
EUPODISCUS. 
Eupodiscus scaber, n. sp._, Grev. — Very large; disc with 
two large submarginal flat processes and a broad striated 
border ; cellules very minute ; whole surface rough, with 
scattered raised points. (PI. X, fig. 1.) 
Hab. Barbadoes deposit^ Cambridge estate; C. Johnson, 
Esq. 
The treasures of the Barbadoes earth really seem to be 
inexhaustible, and do not cease to reward the persevering 
research of my excellent friend Mr. Johnson. The subject is 
becoming exceedingly interesting — far beyond the mere 
publication of a few novel diatoms ; for here is an extensive 
and truly fossil deposit, richer already in some extensive 
genera than any other known locality, while various genera 
of singular structure appear to be altogether peculiar to it. 
It will now be a matter of some importance to make our 
record of this wonderful deposit as complete as possible. 
The present diatom is one of the finest and most distinct 
of its genus, attracting the eye instantaneously by the large, 
flat, circular Auliscus-l^kQ processes which project somewhat 
from the surface. The structure is dense, composed of very 
minute cellules, about 12 in 'OOl"'. The little rough apiculi, 
which appear like so many dark specks remotedly scattered 
in the middle of the disc, are more numerous towards the 
margin; strise of the border 13 in -001''. Diameter of 
disc -0075'^ 
VOL. XII. 
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