DESCRIPTION OF PLATES I & II, 
Illustrating Dr. Greville's paper on New Diatoms. 
Series XVIII. 
rig. 
1. — Flagiogramma decussatum, front view. 
2. — „ „ side view, 
3. — „ Barbadense. 
4. — Mastogonia Adinopt^chm. 
5 . — XantMopyxis f umbonatus. 
6. — Coscinodiscus elegans. 
7. — „ pulchellus. 
9, 10. — „ oblongus. 
11. — Brightwellia Johnsoni. 
12. — Actinojptychus minutus. 
13. — Bupodiscus minutus. 
14. — Biddulphia Johnsoniana, front view, 
15. — „ „ valve. 
16. — „ mammosa, front view of valve. 
17. — Auliscus Hardmanianus. 
18. — Heliopelta nitida. 
19. — Triceratium mammosum. 
20. — „ dulce. 
21. — „ inelegans. 
22. — „ Robertsianum. 
23. — „ ^tokesianum, 
24. — Amphitetras el 
All the figures are X 400 diameters. 
