266 



55. C. affinis Kiitz., V. H. Syn. tab. II, fig. 19, A. S. Atl. tab. X, 



fig. 27. 



Not rare. In some of the gatherings, e. g. from Ejde (Ostero) and 

 Tværaa (Sy de ro) very common. Plankton. 



56. C. parva W. Sm., V. H. Syn. tab. II, fig. 14. 

 Kvalbo, Trangisvaag, Famievatn (Sydero). 



57. C. Botellus Lgst., Lgst. Spetsb. tab. II, fig. 22. 

 Thorsliavn (S trom 6). 



58. C. cymbiformis (Ag.?) Kiitz., V. H. Syn. tab. II, fig. 11a, b, c. 

 Here and there. 



59. C. Cistula Hempr., V. H. Syn. tab. II, fig. 12, A. S. Atl. tab. 

 X, fig. 1. 



Not rare in many of the gatherings. Plankton. 



60. C. lanceolata Ebr., V. H. Syn. tab. II, fig. 7. 

 Here and there. Plankton. 



61. C. helvetica Kiitz., V. H. Syn. tab. II, fig. 15, A. S. Atl. tab. 

 X, fig. 23 and tab. LXXI, fig. 19. 



Found dispersed. Plankton. 



62. C. aspera Ehr., V. H. Syn. tab. II, fig. 8. 



Found scattered about in the material, often as a transitional form 

 to Cymbella lanceolata. 



In a gathering from Nol s o I found a Cymbella aspera, the valve 

 measures about 0,24 mm. in length and 0,045 mm. in breadth. Dorsal 

 striæ 6 in 0,01 mm., more distant in the middle, somewhat doser to- 

 wards the apices. Vcntral striæ 6 in 0,01 mm. in the middle, thcn in- 

 creasing in number to about 10 in 0,01 mm. towards the apices. Striæ 

 moniliform, puncta on the dorsal side 6 in 0,01 mm., on the ventral side 

 10 in 0,01 mm. With regard to its size this form comes near to C. gigantea 

 Pant. (Pant. III, tab. XXI, fig. 321) and rather near to C. gastroides Kiitz. in 

 A. S. Atlas tab. IX, fig. 1 (the latter measures 0,3 mm. in length). P. T. Cleve 

 (Syn. I, p. 175) refers both these figures to C. aspera Ehr. 



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



63. Gomphonema parvulum Kiitz., V. H. Syn. tab. XXV, figs. 7—9. 

 Not rare. 



64. G. angustatum Kiitz. var. producta Grun., Lgst. Spetsb. tab. I, 

 fig. 14, V. H. Syn. tab. XXIV, figs. 52—55. 



Not rare. 



65. G. intricatum Kiitz., V. H. Syn. tab. XXIV, figs. 28—29. 

 Trangisvaag, Ornefjæld (Sydero). 



