PLATE 27. 
1. Pinnularia lata Breb. 8. Eunotia flexuosa var 
2, ,, hemiptera Kutz. bicapitata Grun. 
3. Navicula Pupula Kutz. | 9g. Synedra ulna var amphi- 
4. Pleurosigma scalproides | rhyncus. 
Rab. _ 10. Nitzschia denticula Grun. 
5, Eunotia diodon Ehr. (ets », dissipata var media. 
6. 5, lunaris var bilunaris | 12. Campylodiscus Echineis 
(Ehr) Grun. | var cribrosus. 
7. Eunotia lunaris var undu- | 13. Auricula complexa (Greg) 
lata. Cl. 
PLATE 28. 
(a) Chaetoceros Wighamii | (c) Chaetoceros teres Cl. 
Bright. (dad) Chaetoceros decipiens Cl. 
(6) Chaetoceros didymus Ehr. | (e) Chaetoceros currens Cl. 
