KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 26. N:0 2. 141 



10. N. Integra W. Sm. (1856). — V. lanceolate-elliptical, margins with 3 to 5 undulations, 

 and rostrate- apiculate ends. L. 0,02 7 to 0,03; B. 0,oo8 to 0,oo9 mm. Axial area indistinct, cen- 

 tral very small. Strife about 23 in 0,oi mm., more distant in the middle, slightly radiate at the 

 ends. — Pinnularia rostraia Greg. M. J. IV PI. I f. 14 (1856). Finn, intcgra W. Sm. D. II p. 96. 

 Nav. inteyra Ealfs. in Pritch. p. 895 (1861). Donk. B. D. p. 40 PL VI f. 8. Grun. A. D. p. 36. 

 V. H. Syn. p. 96 PI. XI f. 22. Cymbella integra A. S. Atl. PI. LXXI f. 64—66. Stauroneis 

 JanisrUi Kabh. Alg. Eur. 848 (1859)? i 



Brackish water: Holstein! England (W. Sm.), Belgium (V. H.). 



11. N. Lagerstedtii Cl. N. Sp. — V. linear with triundulated margins and broad, obtuse ends. 

 L. 0,028; B. 0,006 mm. Areas indistinct. Striise 11 (middle) to 15 (ends) in U,oi mm. slightly 

 radiate, parallel at the ends. — Nav. sp. Lagst. Spitsb. D. p. 35 PI. II f. 12 (1873). 



Fresh water: Spitsb. (Lagst.). 



12. N. subtilissiina Cl. (1891). — V. linear, with capitate ends. L. 0,032; B. 0,oo5 mm. 

 Axial area indistinct, central small. Strise about 40 to 45 in 0,oi mm. in the middle stronger, 

 more distant and more radiate; other stride slightly radiate. — Cl. D. of Finl. p. 37 PL II f. 15. 

 Stauroneis linearis Lagst. Spitsb. D. p. 37 PL II f. 13? 



Fresh water: Finland (Imandra Lappmark)! Sweden (Westerbotten, Degernas)! Spitsbergen 

 (Lagst.). 



13. N. Kalfveiisis Grun. Ms. — V. linear with rounded ends. L. 0,02; B. 0,oo5 mm. 

 Areas indistinct. Strise 24 (middle) to 27 (ends) in 0,oi mm. 



Fresh water: Kalfva, Alands socken, Sweden, fossil (Grun.). 



14. N. subinflata Grun. (1883). — V. linear, more or less gibbous in the middle, with 

 rounded ends. L. 0,o25 to 0,04; B. 0,oo8 mm. Axial area indistinct, central small irregular. 

 Striae about 19 in 0,oi mm., almost parallel. The three or four median strise are shorter and much 

 more distant than the others. Frustule in the zonal view rectangular; the connecting zone with 

 faint longitudinal lines. — Grun. in Cl. Vega p. 470 PL XXXVII f. 50. 



Marine: Cape "Wankarema! Arctic America! Norway, Grip! 



Var. elliptica Cl. — V. elliptical with rounded ends. L. 0,035; B. 0,oi3 mm. Strise 20 

 in 0,01 mm. 



Marine: Adriatic (CL M. D. N:o 210). 



Naviculse Microstigmaticse Cl. 



Valve elongated, usually lanceolate to linear, never panduriform. Axial area narrow or in- 

 distinct. Central area small and rounded, or a transverse stauros. Structure: smaU, but distinct, 

 puncta arranged in parallel, or slightly radiate, transverse striae, and undulating longitudinal 

 rows, the median transverse strise not alternately longer and shorter, connecting zone complex 

 or simple. 



This large section comprises a number of species, hitherto placed in Navicula, Stauroneis^ 

 Fleurostauron, Schi^osiauron and Schizonema. The may be classed in the following divisions: 



1. Stauroneis. Central nodule transversely dilated into a simple stauros. No diaphragms 

 at the ends of the valve. Connecting zone simple. 



2. Fleurostauron. Like Stauroneis, but with diaphragms at the ends of the valve. 



3. Schizostauron. Central nodule transversely dilated into a furcate or bifid stauros. 



' To judge from the figure. I have not seen any specimens in the material. 



