I 



K0N6L. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 31 



65. N. inflexa G-reg. (1856). — V. narrow, elliptic-lanceolate, with obtuse, conical ends. 

 L. 0,033 to 0,04.5; B. 0,0075 to 0,0085 mm. Axial area indistinct, central area small, roimded. Striee 

 11 in 0,01 mm. strongly radiate throughout, distinctly lineate; lineolee 23 in 0,oi mm. — P?w«. 

 inflexa Greö. T. M. S. IV p. 48 Pl. V f. 20. N. inflexa Donk. B. D. p. 54 Pl. VIH f. 2. A. S. 

 Atl. XL VI f. 69, 70. 



Marine: Sea of Kära! North Sea! 



N. inflexa v. Biharensis Pant. II p. 48 Pl. III f. 36 from Bremia seems to be another 

 species, as it has .scarcely any resemblance to N. inflexa. 



66. N. nortlmmbrica Donk. (1861). — V. very convex, narrow lanceolate, with acute ends. 

 L. 0,046 to 0,076; B. 0,oo8 to 0,01 mm. Axial area indistinct; central area small, rounded. Striaä 

 10 to 11 in 0,01 mm. (the median stronger and more distant) very slightly radiate in the middle 

 transverse at the ends, lineate; lineola; 25 in 0, 01 mm. Frustule quadrate. — Donk. M. J. I p. 9 

 Pl. I f. 5. B. D. p. 54 Pl. VIII f. 1. A. S. XL VII f. 19, 20. 



Marine: North Sea! 



This species is remarkable for the extreme convexity of its valves, from which cause it is 

 very difficult to find a specimen in the valvular view. 



67. N. (Klioiconeis) Cxibitus Temp. a. Brun (1889). — V. very convex, linear-lanceolate 

 with acute, excavate ends. L. 0, 09 to 0,095; B. 0, 01 3 mm. Axial area indi.stinet. Central area 

 a narrow, transverse fascia, arising from the two distant median strise. Terminal areas large, 

 triangiilar spaces (visible only in the zonal view). Strii» 6 in 0,oi mm., parallel, coarsely lineate; 

 lineolse 21 in 0,oi mm. Frustule arcnate. — D. foss. du Japon p. 42 Pl. V f. 8. 



Marine: Japan, fossil! 



68. N. Zostereti G-rdn. (1860). — V. slightly convex, narrow lanceolate, subacute. L. 0,o6 5 

 to 0,14; B. 0,011 to 0,022 mm. Axial area indistinct; central area very small, orbiciilar. Strise 

 7 in 0,01 mm. (a little more close towards the ends) transverse, and slightly curved, lineate; lineolse 

 23 in 0,01 mm. — Verh. 1860 p. 528 Pl. IV f. 23. A. S. Atl. XL VII f. 42, 43, 44. 



Marine: Adriatic (Grun.), Bab el Mandeb! Ceylon! Labuan! Java! China! Japan (Atl.), 

 Sandwich Islands (Atl.), Brazil (Atl.), Atlantic City, fossil! 



Var. seychellensis Cl. — L. 0,06 5; B. O,oii mm. Strise 12 in 0,oi mm. 



Marine : Seychelles (Van Heurck Coll.) ! 



N. Zostereti is very similar to N. direcfa, but has more convex valves and slightly radiate, 

 strise curved towards the ends, finely lineate. 



69. N. spiiria Cl. N. Sp. — V. rarrow, lanceolate, acute. L. 0,o9 to 0,]5; B. O.013 to 0,021 

 mm. Axial area indistinct. Central area .small, irregularly rounded. Strise 7 in 0,oi mm., slightly 

 radiate in the middle, transversse at the ends, coarsely lineate; lineolse 21 to 24 in 0, 01 mm. 



Marine: Mediterranean Sea (Gulf of Naples)! Adriatic! New Caledonia (Kinker Coll.)! Gala- 

 pagos Islands (Weissflog Coll.)! 



Var. asymmetrica Cl. — Axial area narrow, unilateral. Strise on the side opposite to the 

 axial area, crossed by an irregular, narrow lateral area. L. 0,15; B. 0,022 mm. Strise 6 in 0,oi 

 mm., lineolse 27 in 0, 01 mm. 



Marine: Hungary, fossil (Karnaud Deposit in Deby Coll.)! 



N. spuria resembles N. directa, from which it differs by its slightly radiate strise, and 

 N. pennata, from which it diiFers by its small central area. From N. Zostereti it may be distin- 

 guished by its coarsely lineate strise and from N. distans by its indistinct axial area. 



70. N. fortis Greg. (1856). — V. very convex, elliptic- to rhombic-lanceolate, obtuse. L. 0,05 

 to 0,089; B. 0,01 to 0,017 mm. Axial area indistinct; central area small, orbicular. Strise 8 to 9 

 in 0,01 mm. slightly radiate in the middle, transverse at the ends, coarsely lineate; lineolse 24 in 



