TRANSACTIONS OF MICROSCOPICAL SOCIETY. 
DESCRIPTION OF PLATES I, II, 
Illustrating Mr. Roper's paper on Biddulphia. 
PLATE I. 
Fig. 
1. — Front view of B. Tuomeyii. 
2. — Side view of a detached valve of B. Tuomeyii. 
3. — Side view of ^. aurita^ oval variety. 
4. — Front view of B. rJiombus. 
5. — Front view of B. Baileyii. 
6. — Front view of B. Baileyii immediately after self-division. 
7. — End view of B. Baileyii^ showing the flat central portion of the valve, 
8. 9. — Side views of detached valves of B. Baileyii. 
10, ll.—Front views of B. 
PLATE II. 
12. — Side view of B. granulata. 
13, 14. — Front views of B. reticulata. 
15. — Side view of B. reticulata. 
16. — Front view of B. reticulata, var. ^. 
17. — Side view of B. reticulata^ var. /3. 
18. — Front view of B. tumida approaching self-division. 
19. — Side view of B. tumida. 
20. 21. — Front views of B. Indica. 
22. — Side view of B. Indica. 
23. — Front view of B. turgida from Pembroke Harbour. 
24. — ^Front view of B. Icevis from West Point, New York. 
25. — Front view of B. Icevis from Natal. 
26. — Side view of B. Icevis. 
27. 28. — Front views of B. radiata. 
29. — Side view of B. radiata. 
All the figures are X 400 diameters. 
