23S 
MARINE AND ESTUARINE DIATOMS. 
EXPLANATION OF PLATES. 
The following figures are only rough sketches, drawn in most instances 
from the objects themselves, without any attempt to represent, except in a 
general way, their relative proportions. Owing also to their small size, it 
has been impossible to represent upon them their finer markings. As, however, 
only generic differences are aimed at, the want of these particulars is less 
important. For more accurate delineations, and figures drawn to scale, the 
student is referred to the standard authorities mentioned in the text. 
Plate I. 
. 1 . 
Acnanthes longipes Ag. 
Fig. 18. 
Diatoma. 
2. 
Actinoptychus undulatus Kutz. 
19. 
Encyonema. 
3. 
Amphora. 
20. 
Epithemia turgida. 
4. 
Amphiprora. 
21. 
Epithemia zebra. 
5. 
Amphipleura 
22. 
Eunotia diodon. 
6. 
Bacillaria paradoxa Gmel. 
23. 
Fragillaria. 
7. 
Biddulphia aurita Lyn. 
24. 
Gomphonema geminatum A. 
8. 
Campylodiscus Lyn. 
25. 
Grarnmatophora serpentina. 
9. 
Chaetoceros chriophyllum Cast 
26. 
Grammatophora marina. 
10. 
Chaetoceros decipiens. 
27. 
Homoecladia filiformis. 
11 
Chaetoceros. 
28. 
Hyalodiscus. 
12. 
Cocconeis scutellum. 
29. 
Isthmia. 
13. 
Cocconeis scutellum. 
30. 
Licmophora. 
14. 
Cyclotella. 
31. 
Mastogloia. 
14a Cymatopleura. 
32. 
Melosira nummuloides. 
15. 
Coscinodiscus. 
33. 
Melosira orichalcea. 
16. 
Cocconema lanceolatum. 
34. 
Meridion. 
17. 
Cymbella gastroides. 
* 
Plate II. 
. 1 . 
Navicula (Pinnularia) nobilis 
19. 
Rhizosolenia 
Ehr. 
Fig. 20. 
Skeletonema. 
2. 
Navacula distans. 
21. 
Schizonema crucigerum. 
3. 
Navicula maculata Bail. 
22. 
Stauroneis Phcenicenteron Eh 
4. 
Navicula Smithii Ag. 
23. 
Stauroneis obliqua. 
5. 
Nitschia sigmoidia Ehr. 
24. 
Striatella unipunctata. 
6. 
Nitschia sigma W. S. 
25. 
Surirella ovalis Breb. 
7. 
Nitschia bilobata. 
26. 
Surirella splendida Kutz. 
