TEANSACTIONS OF MICHOSCOPICAL SOCIETY. 
DESCRIPTION OF PLATE I, 
Illustrating Dr. Greville^s paper on New Diatoms. 
Series VIII. 
Pig. 
1. — Plagiogramma Robert sianum, front view. 
2. — „ 5, side view. 
3. — Campjlodiscus ornatiis. 
4. — 5, Wallichianus. 
5. — 5, Robertsianus. 
6. — crebrecostatus. 
7. — Navicula Lewisiam. 
Johfisoniam. 
9.— 
10, 11.— 
12.— 
13, 14.— 
notabilis. 
luxuriosa. 
? Cistella, front view. 
side view. 
15. — A^nphiprora oblonga. 
All the figures are X 400 diameters. 
CORRIGENDUM IN SERIES VII. 
The walls of the cellules in Triceratium Davyanum are nnfortunately ren- 
dered much too thick by the engraver. The figure is, in other respects, 
faithfully executed. 
