274 



In a gathering from Trangisvaag a P. stomatophora occurred in which 

 the transapical fascia was reduced to a verj' narrow area, formed by 

 the absence of a single stria on each side of the central nodule, and 

 thus it forms a transitional form to f. continna Cl. 



123. P. mesogongyla Ehr., Cl. Vega Exp. tab. XXXVI, fig. 20. 

 Trangisvaag (Sydero). 



Brevistriatæ Cl. Syn. II, p. 85. 



124. Pinnularia brevicostata Cl., Cl. Diat. Fini. tab. I, fig. 5. 

 Thorshavn (S tro m 6 ). 



125. P. acrosphæria Bréb. formå genuina, A. S. Atl. tab. XLIII, 



fig. 16. 



Nolso; Kirkebokamp, Thorshavn (S trom 6); Trangisvaag (Sy der 6). 

 Rather rare in gathcrings from these localities. 



126. P. nodosa Ehr. formå genuina, A. S. Atl. tab. XLV, figs. 

 57—58. 



Kvanhangen (Sydero). 



127. P. parva (Ehr.) Greg. var. Lagerstedtii Cl., Lgst. Spetsb. 

 tab. II, fig. 4. 



Rather rare. Tværaa, Trangisvaag (Sydero). 



Majores Cl. Syn. II, p. 88. 



128. Pinnularia major Kiitz., V. H. Syn. tab. V, fig. 3, A. S. Atl. 

 tab. XLII, fig. 8. 



Not rare. Plankton. 



129. P. Dactylus Ehr., A. S. Atl. tab. XLII, figs. 3, 4, 6. 



Here and there. Common in a gathering labelled: »Algæ from a 

 stream at the head of Trangisvaagfjord« (Sydero). 



Cnmplexæ Cl. Syn. II, p. 90. 



130. Pinnularia viridis Nitzsch, V. H. Syn. tab. V, fig. 5. 

 Var. intermedia Cl., A. S. Atl. tab. XLII, figs. 9—10. 



Var. commutata Grun., W. Sm. Syn. tab. XVIII, fig. 163 a. 



Var. leptogongyla (Ehr.?) Grun., Donk. Br. Diat. tab. XII, fig. 4. 



Var. rupestris Hantzsch, A. S. tab. XLV, fig. 44. 



Scattered abont in the whole of the material, the varieties mixed 

 together with the main species. 



131. P. distinguenda Cl., Cl. Diat. Fini. tab. I, fig. 1. 

 Plankton from »the month of Sandsvatn« (Sando). 



132. P. gentilis Donk., A. S. Atl. tab. XLII, fig. 2. 



Here and there. Not rare in a gathering from Næs (O s te ro). 



