536 



CYMBELLA Ag. 1830. Cl. Syn. I., p. 156. 

 *28. Cymbella ventricosa Ktz., V. H. Syn. tab. III., iig. 15. 

 Between Thorsvig and Kval vig (S trom 6). 



*29. C. æqvalis W. Sm, V. H. Syn. tab. III., Jig. 24. 

 Between Thorsvig and Kvalvig iStrorao). 



*30. C. affinis Ktz., V. H. Syn. tab. II., tig. 19. 

 Thorshavn (S trom 6). 



*31. C. cymbiformis (Ag.?) Ktz., V. H. Syn. tab. II., lig. 11. 

 Kalbakfjord (S trom 6). 



*32. C. Cistula Hempr., V. H. Syn. tab. II., ligs. 12 — 13. 

 Kvi vig, Thorshavn (S trom 6). 



*33. C. lanceolata Klir., V. H. Syn. tab. II., lig. 7. 

 Tværaa (Sydero). 



*34. C. hebridica Grun., Cl. Diat. Fini. tab. II., ligs. 16—17. 



Between Thorsvig and Kvalvig (Stromo). 



All the Cgmbellæ occur only as solitary specimens in the above- 

 mcntioned gatherings. 



GOMPHONEMA Ag. 1824. Cl. Syn. I., p. 178. 

 *35. Gomphonema gracile Ehr. var. naviculacea W. Sm., V. H. 

 Syn. tab. XXIV., ligs. 13—14. 

 Tværaa (Sydero). 



*36. G. subclavatum Grun., V. H. Syn. tab. XXIII, ligs. 38— 41. 

 Kalbakfjord (Stromo). 



37. G. Aestuarii Cl., Cl. Diatomiste II., tab. III., fig. 4. — Fig. 

 112. 1000 /i. 



Fairly common. Fonnd in 18 gatherings from 

 Videro; Bor do; Ostero; Stromo; Vaago; Trold- 

 hoved; and Sydero, and in some of the gatherings, 

 e. g. from Thorshavn (Stromo) and Troldhoved rather 

 abundantly. Cleve (Syn. I-, p. 188) records the length 

 of this species (from Hastings) to be 0,02 mm.— 0,028 mm.; 

 I have freqnently fonnd specimens which were shorter 

 0,012 mm. in length. The transverse fascia is situated 

 more closely to the lower end of the valve; there are distinct diaphragms 

 at both apices. and Ihe valvcs are occasionally almost rectilinear, in the 

 latter case it strikingly resembles a Rhoicosphdiiia PullusJ. S. (A. S. Atl., 

 tah. CCXIIL, lig. 20). 



38. G. exiguum Ktz., V. II. Syn. lab. XXV., fig. 34. 



Gjov (Ostero); Thorshavn (Stromo); Store Dimon; Vaags Ejde 

 (Sydero). 



Fonnd in a gathering from Thorshavn (Stromo), not rare. 



