80 
Greville, on New Diatoms. 
tance round the umbilicus^ gradually becoming crowded and 
more minute^ and ultimately passing into fine close striae as 
they reach the circumference. Radiating lines numerous (24? 
in the example figured), commencing indefinitely, generally at 
about a third of the radius from the centre, so narrow as fre- 
quently to resemble dark striae, but, on careful examination, 
are perceived to be exceedingly narrow blank spaces ; margin 
or border pale, smooth, and somewhat broad. 
Cosmic discus Barbadensis, n. sp., Grev. — Disc convex, with 
numerous linear blank lines, extending about one third of the 
radius from the margin ; the portion of the disc so occupied 
forming a sort of broad, less convex border. Diameter '0034''. 
(Pig. 12.) 
Hab. Barbadoes deposit, Cambridge estate; in slides com- 
municated by C. Johnson, Esq. ; exceedingly rare. 
Disc convex for about two thirds of the radius from the 
centre, then becoming somewhat flattened ; umbilicus a small, 
circular, blank space ; granules equal, minute, distinct radi- 
ating in straight lines to the boundary of the convex centre, 
then becoming larger, and diminishing gradually in size to 
the margin. In the flattened circumference are situated 
about fourteen blank, linear, radiating spaces, not produced 
by divergence in the lines of granules, but commencing and 
terminating abruptly. 
Cosmiodiscus Normanianus^ n. sp., Grev. — Radiating blank 
lines numerous, extending about half way from the margin 
to the centre, the intervening compartments filled with radi- 
ating lines of minute puncta ; centre with scattered and much 
larger puncta. Diameter '0024/^ (Fig. 
Hab. Barbadoes deposit; cabinet of George Norman, Esq.; 
exceedingly rare. 
The central portion occupying as much as half the radius, 
containing large, remotely scattered puncta, and presenting 
a sudden contrast to the minute puncta between the blank, 
radiating lines, give a remarkable aspect to this disc, and may 
possibly lead to its separation when we come to be better ac- 
quainted with it. 
EUPODISCUS. 
Eupodiscus Hardmanianus, n. sp., Grev. — Large ; disc with 
four circular marginal processes, hexagonally cellulate, with 
a broad, raised, remotely striate margin, and circle of teeth. 
Diameter -0055'^ (Fig. 14.) 
Huh. Shell-cleanings from South America ; L. Hardman, 
Esq. 
