264 



32. N. subtilissima Cl., Cl. Diat. Fini. tab. II, fig. 15. 

 Rather rare. Trangisvaag (S yd er 6); Thorshavn (S trom 6). 



NAVICULÆ MICROSTIGMATICÆ Cl. Syn. I, p. 141. 



33. Stauponeis anceps Ehr. var. linearis Ehr. , V. H. Sjai. tab. 

 IV, figs. 7—8. 



Nolso; Trangisvaag (S yd er 6). 



Var. amphicephala Kiitz., V. H. Syn. tab. IV, figs. 4 — 5. 



Not rare. 



34. S. Phoenicenteron Ehr. var. amphilepta Cl., Herib. Diat. 

 d'Auv. tab. III, fig. 18. 



Here and there. 



35. S. parvula Grun. var. prominula Grun., Cl. Syn. I, p. 149. 

 Rare. Trangisvaag (Sy der 6). 



Var. producta Grun., V. H. Syn. tab. IV, fig. 12. 



Not common. Nolso; Viderejde (Vi der 6); Trangisvaag (Sy der 6). 



36. S. Legumen Ehr., V. H. Syn. tab. IV, fig. 11. 

 Nolso; Ornefjæld (Sydero). Plankton. 



37. S. Smithii Grun., V. H. Syn. tab. IV, fig. 10. 

 Rare. Sand (San do). 



38. S. javanica Grun., Pant. III tab. VIII, fig. 143. 

 Rare. Nolso. 



39. S. acuta W. Sm. var. densestriata m. Fig. 31 ^^o/^. 

 L. 0,056 mm., B. 0,01 mm. Striæ at least 25 in 0,01 mm. 



Valve rhombic-lanceolate. The apical area dilated in the 



central part of the valve. Stauros broadening towards and 



reacliing Ihe margin, which shoM^s a slight incurvation at 



this point. Striæ delicate and obscure, distinct only at the 



stauros. 



In spite of the delicacy of its striæ and the somewhat 

 different aspect of its central part I regard this form as a va- 

 riet}' of S. acuta W. Sm. With regard to the niimber of striæ 

 gj it approaches more closely to S. Frauenfeldiana (Grun. Nov. Exp. 

 tab. I, fig. 13), but judging from Grunow's flgure of it, S. Frauen- 

 feldiana and the form in question are doubtless two distinct species. 

 Found in a gathering labelled: »Green algæ from a swamp on Nolso«. 



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



40. Cymbella microcephala Grun., V. H. Syn. tab. VIII, fig. 36. 

 Plankton from Sorvaagsvatn (Vaago). 



