JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE XII, 
Illustrating Rev. E. O’Meara’s Paper on Diatomaceous Forms 
from Arran Islands. 
Kg. 
1. — Pleurosigma gigcmieum, var. baccatum. 
2. — Plagiogramma cost alum. a. Front view. 
3. — Melosira Wrightii. a. Side view. 
4. — Pinnularia marginata. 
5. — Pinnularia scutellum. 
G . — Jmphiprora costala 
