TRANSACTIONS OF MICUOSCOPICAL SOCIETY. 
DESCRIPTION OF PLATES X & XI, 
Illustrating Dr. Greville^s paper on New Diatoms, 
Series XII. 
Fig. 
1. — Eupodiscus scaber. 
2. — Aulacodiscus decorus, 
3. — Triceratium zonaium. 
4. — „ plumosum. 
5. — Entogonia reticulata. 
6. — AuUscus Moronensis. 
7. — Triceratium 
9.- » 
10. — Biddulphia punctata. 
11. — Auliscus Normanianus. 
All the figures are X 400 diameters. 
