KONGL. SV. V1-:T. AKADKMIKNS IIANDLINGAH. HAM) 26. N:o 2. 141 



10. N. iiitogrsi W. Sm. (185G). — V. laiiceolate-elli])tical, iiiargins witli 3 to 5 undulations, 

 and I'ostrate-apiculate ends. L. (),oa7 to <>,():); H. 0,0(18 to 0,(mi',i nun. Axial area indistinct, cen- 

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

 ends. — Fiiinnlaria rostrafa Greo. M. J. IV PL 1 f. 14 (IHf)!)). Finn, intcyra W. 8m. D. TI ji. !)6. 

 Nav. intcf/ra Kalfs. in Pritch. p 8;»5 (1H(>1). Donk. B. D. p. 40 PL VI f. 8. Grun. A. D. p. 36. 

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

 Junischti Rabh. Alg. Eur. 848 (1859)? ' 



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



11. N. Laf^erstedtii Cl. N. Sp. — V. linear with triundulated margins and broad, oljtuse ends. 

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

 radiate, parallel at the ends. — Xav. sp. Lagst. Spitsb. D. p. 35 PL II f. 12 (1S73). 



Fresh water: Spitsb. (Lagst.). 



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

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

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

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



Fresh water: Finland (Iraandra Lappmark)! Sweden (Westerbotten, Uegernas)! Spitsbergen 

 (Lagst.). 



13. N. Kiilfveiisis (tRUN. Ms. — V. linear with rounded ends. L. 0,02; B. 0,oo5 mm. 

 Areas indistinct. Strite 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 le.ss gibbous in the middle, with 

 rounded ends. L. 0,o25 to 0,04; B. 0,008 mm. Axial area indistinct, central small irregular. 

 Striai about 19 in 0,oi mm., almost parallel. The three or four median stria? 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. Stria? 20 

 in 0,01 mm. 



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



Naviculse Microstigmaticae 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: small, but distinct, 

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

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

 or simple. 



This large section comprises a number of species, hitherto placed in Xaricula, Sfauroiieis^ 

 Plenrostaiiron, Schizostauron and Schizonrma. 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. PIcurostauron. 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. 1 have not seen any specimens in the material. 



