200 .DR. HEIBERG, ON DANISH DIATOMACEZ. 
Tribus 2. Naviculee cuneate. 
35. Gomphonema, Ag. 
36. Cocconeis, Ehr. 
Fam. 7. SurizeELLex, Grun. 
Tribus 1. Surirellee genuine. 
37. Surirella, Turpin. 
38. Campylodiscus, Ehr. 
Tribus 2. Surirellee cuneate. 
39. Novilla, n. gen. 
B. “ Side view” unsymmetrical longitudinally. 
Fam. 8. Errraemizz, Gran. 
40. Epithemia, Bréb. 
41. Himantidium, Ehr. 
Fam. 9. CyMBELLE#, Pritch. 
42. Cymbella, Ag. 
43. Amphora, Ehr. 
B. “ Front view ” unsymmetrical in the longitudinal 
axis. 
Fam. 10. Nirzscuizz, Grun. 
44, Nitzschia, Hassall. 
45. Tryblionella, Sm. 
46. Amphipleura, Kutz. 
II. Valves unequal (uensdannede). 
Fam. 11. Acnantuex, Grun. 
Tribus 1. Achnanthee genuine. 
47. Achnanthes, Borg. 
48. Achnanthidium, Kutz. 
Tribus 2. Achnanthee cuneate. 
49. Rheicosphenia, Grun. 
