272 



form and number of striæ, but its transapical fascia is bordered by 

 two stronger striæ such as O. Muller (Bac. a. d. Hochs Riesengeb. p. 23) 

 has noticed in P. Brchissonii and P. microstanron. Perhaps this small 

 form might therefore be referred to P. microstanron. 



107. P. microstauron Ehr., A. S. Atl. tab. XLIV, fig. 14, Herib. 

 Diat. d'Aiiv. tab. IV, fig. 1. 



Nolso; Trangisvaag (Sydero); Sand (Sando); Hojvig, Kirkebokamp 

 (S t r 6 m 6 ). 



108. P. termitina Ehr., A. S. Atl. tab. XLV, fig. 64. 

 Trangisvaag (Sydero). 



109. P. Oculus Ost., Ost. Ferskv. Diat. Ostg. tab. I, fig. 6. 

 Trangisvaag (Sydero^; Sand (Sando). 



This species, Vi'hich has been found in the Færoes only in the two 

 gathcrings richest in saltwater forms, has also been met with in East 

 Greenland in a locality which seems to suggest that it is a saltwater 

 form (cfr. 1. c. p. 269). 



Divergentes Cl. Syn. II, p. 77. 



110. Pinnularia divergentissima Grun., V. H. Syn. tab. VI, fig. 32. 

 Here and there. 



A small Pinnularia occurs in a gathering from Midvaag (Vaago). 

 L. 0026 mm., B. 0,004 mm., Striæ 12—13 in 0,01 mm. Ils strongly radiant 

 and convergent striæ proves its relationship to P. dinergentissima, but 

 it differs from this species in being altogether linear. 



111. P. Brébissonii Kiitz., V. H. Syn. tab. V, fig. 7. 

 Kirkebokamp, Hvidenæs Stromo. 



Var. diminuta V. H., V. H. 1. c, fig. 8. 

 Viderejde (Vi der 6). 



112. P. Legumen PZhr., V. H. Syn. tab. VI, fig. 16. 

 Nolso; Kirkebokamj) Stromo); Trangisvaag (Sydero). 

 Formå vix undulata, V. H. 1. c, fig. 17. 



Nolso. 



113. P. platycephala Ehr., Cl. Diat. of Fini. tab. II, fig. 1. 



Næs (O s ter 6). Found one example only, it differs from the typical 

 form in being somewhat shorter and comparatively broader. 

 L. 0,078 mm., B. 0.019 mm. 



114. P. divergens W. Sm., W. Sm. Syn. tab. XVIII, fig. 177. 

 Not rare. 



Var. elliptica Grun., A. S. Atl. tab. XLIV, figs. 6—7. 

 Kirkebokamp (S tro m 6 ;. 



Formå minor, O. M. Riesengeb. tab. III, fig. 9. 

 Famievatn (Sydero). 



