271 



the central nodule and the margin. An elevated apical part oc- 

 curs on both side of the raphe. Tliis species bears a fairly close 

 resemblance to N. carinifcra Griin. A. S. Atl. lab. III, fig. 2 from 

 Campeche Bay, but the striæ are much closer and, as far as I can 

 see, not punctate. 



Found in a galhering from Midvaag (Vaago). 



PINNULARIA Ehr. 1843. Cl. Syn. II, p. 71. 



Gracillimæ Cl. Syn. II, p. 74. 



100. Pinnularia undulata Greg. var. subundulata Greg., Van Heurck: 

 Types Nr. 140. 



Rare. Nordreoer. 



101. P. sublineapjs Grun., V. H. Syn. tab. VI, fig. 25. 

 Kirkebokamp, Thorshavn (Stromo). 



102. P. leptosoma Grun., V. H. Syn. tab. XII, fig. 29. 

 Kvalbo (Syd er 6). 



Capitatæ Cl. Syn. II, p. 75. 



103. Pinnularia appendiculata Ag., V. H. Syn. tab. VI., figs. 30—31. 



Nolso; Kirkebokamp (Stromo); Trangisvaag (S yd er 6). Not rare 

 in a gathering labelled: »Covering bare spots on peaty ground«, south side 

 of Trangisvaagfjord (Syde ro). 



104. P. subcapitata Greg., V. H. Syn. tab. VI, fig. 22, A. S. Atl. 

 tab. XLIV, fig. 53. 



Not common. Thorshavn (Stromo). 



105. P. Interrupta W. Sm. formå stauroneiformis, O. M. Riesen- 



geb. tab. III, fig. 18. 



Klakken (Bord 6). Common in a gathering from Trangisvaag 

 (Sydero). 



106. P. mesolepta Ehr., V. H. Syn. tab. VI, figs. 10— 11. 

 Trangisvaag (Sydero); Midvaag (Vaago); Nolso. 



Var. stauponeiformis Grun., A. S. Atl. tab. XLV, figs. 52 — 53. 



Nolso; Sydero. 



Var. angusta Cl., A. S. 1. c, fig. 63. 



Midvaag (Vaago). 



Var. polyonca Bréb., O. M. Riesengeb. tab. III, fig. 20. 



Nolso. 



In a gathering from Sydero I found a small triundulated Pinnularia 

 with apices capitate. It approaches P. mesolepta stauroneiformis in size, 



