KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 109 



Var. thmholmensis Dannf. (1882). — V. lanceolate, with more distinctly capitate ends. 

 L. 0,02; B. 0,005 mm. Striis 26 in 0,oi mm. — Nav. thitrholmensis Dannf. Bait. D. p. 27 PI. I 

 f. 11. N. Uvis Pant. II p. 50 PI. XXV f. 366? 



Btackish water: Bay of Finland (Dannf.). 



h'. gregaria connects N. cryptocephala of the section Lineolatai with N. halophila, so that it 

 might perhaps have been placed as well there as here. Its parallel strise seem however to in- 

 dicate a closer relation to iV. halOpMla. 



2. N. Wankaremse Cl. (1883). — V. narrow, lanceolate, with obtuse, prolonged ends. L. 

 0,035; B. 0,007 mm. Median line with approximate median pores. Axial area indistinct. Central 

 area a broad, transverse fascia. Strife parallel, about 30 in 0,oi mm., obsolete between the margin 

 and the median line. Longitudinal strise not seen. — N. Kryohonites? var. WanharemcB Cl. 

 Vega p. 473 PL XXXVII, f. 47. 



Marine: Cape Wankarema, North Siberian Sea! 



The accurate place in the system, which this form occupies, is difficult to decide. I have 

 placed it here, at it seems to be nearest akin to N. gregaria. 



3. N. Kryokonites Cl. (1883). — V. lanceolate, obtuse. L. 0,o84; B. 0,on mm. Central 

 area a transverse, broad fascia. Striae 22 in 0,oi mm. — Cl. Vega p. 473 PI. XXXVII f. 44. 



Marine:, Cape "Wankarema! 



Var. subprotracta Cl. (1883). — V. rhombic-lanceolate, with subcapitate ends. L. 0,033; 

 B. 0,007 mm. Strise 22 in 0,oi mm. — Cl. Vega 1. c. f. 46. 



Marine: Cape Wankarema! 



Var. semiperfecta Cl. (1883), — ^ V. rhombic-lanceolate. L. 0,o28; B. 0,oo8 mm. Central 

 area a unilateral fascia. — Cl. Vega 1. c. f. 45. 



Marine: Cape Wankarema! 



4. N. microrhynchiis G-run. (1882). — V. narrow lanceolate, with acute, prolonged ends- 

 L. 0,024; B. 0,004 mm. Median pores approximate. Strise 16 (middle) to 17 (ends) finely punctate. 

 — Grun. Foss. H. Ost. Ung. p. 149 PL XXX f. 46. 



Slightly brackish water: Hungary, fossil (Grun.). 



N. microrhynchus is according to Grunow related to N. Bulnheimii, which I have placed 

 among the MicrostigmaticEe because of its wider central strise and its, (somewhat indistinct) complex, 

 connecting zone. N. microrhynchus Pant. (II p. 51 PL III f. 38; PL VIII f. 145, 1889) is, if the 

 figures in Pantocsek's work be accurate, not the species of Grunow, which has no axial area. 



5. N. halophila Grun. (1881). — V. rhombic-lanceolate, subacute. L. O.05; B. 0,oi to 0,012 

 mm. Strise 19 to 20 (16 according to V. H. Syn.) in 0,oi mm. convergent at the ends, elsewhere 

 parallel. Longitudinal strise fine. — N. cuspidata var. haloph. Grun. in V. H. Syn, p. 100 Suppl. 

 PL B. f. 30. N. protracta forma minor Pant. Ill PL XX f. 301 (1893)? 



Brackish water: Sweden, Sturko in Blekinge! England, Hull! Belgium (V. H.) Saxony 

 (Mansfelderseen) ! France, Medoc! 



6. N. cuspidata Kutz. (1834). — V. rhombic-lanceolate, with acute ends. L. 0,07 to 0,15; 

 B. 0,017 to 0,03 mm. Transverse strise 14 to 19, longitudinal 26 in 0,oi mm. — Bacillaria fulva 

 Nitszch. p. p. 1817 (according to Kutz.). N. fulva Donk. B. D. PL VI f. 9? Frustulia cuspidata 

 KtJTZ. Syn. PL II f. 26. Nav. cuspidata Kutz. Bac. p. 94 PL III f. 24, 37. W. Sm. B. D. I p. 47 

 PL XVl f. 131. DoNK. B. D. p. 39 PL VI f. 6. Grun. Banka D. PL II f. 16. Fresenius Senckenb- 

 Abh. IV PL IV f. 18. Strose Klicken f. 22. V. H. Syn. p. 100 PL XII f. 4. Nav. Reinicheana 

 Rabh. Alg. Sachs. W.o 802 (1859). Vanheurckia cuspidata BntB. Ann. Soc. phyto. et microgr. de 

 Belgique Vol. I p. 205 (1868). 



Fresh water: Sweden! Finland! Germany! France! Switzerland! Bengal! Japan! New Zea- 

 land! Australia : (Murray River)! Guatemala, fossil! Ecuador! Dakota! Illinois! 



