KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 26. mO 2. 109 



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

 L. 0,02; B. 0,005 mm. StriiE 26 in 0,oi mm. — Nav. thur holmen si s Dannf. Balt. D. p. 27 Pl. I 

 f. 11. .V. Icevis Pant. II p. 50 Pl. XXV f. 3(i6? 



Brackisli water: Bay of Finland (Dannf.). 



N. i/regaria connects N. cryptocephala of tlie section Lineolatre with N. lialopliila, so that it 

 might perhaps have been placed as well tliere as here. Its parallel stri» seem however to in- 

 dicate a closer relation to N. halophUa. 



2. N. Waiikarein»! 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. StritB parallel, about 30 in 0, 01 mm., obsolete between the margin 

 and the median line. Longitudinal strite not seen. — N. Kry ökon ites? var. Wankaremce Cl. 

 Vega p. 473 Pl. XXXVII, £47. 



Marine: Cape Wankarema, North Siberian Sea! 



The accurate place in the system, which this form oecnpies, 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, obtnse. L. 0,o84; B. 0,oii mm. Central 

 area a transverse, broad fascia. StricC 22 in 0, 01 mm. — Cl. Vega p. 473 Pl. XXXVII f. 44. 



Marine: Cape Wankarema! 



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

 B. 0,007 mm. Striee 22 in 0, 01 mm. — Cl. Vega 1. c. f. 46. 



Marine: Cape Wankarema! 



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

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



Marine: Cape Wankarema! 



4. N. microrhynclins Grun. (1882). — V. narrow lanceolate, with acnte, prolonged ends- 

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

 — Grun. Foss. D. Öst. Ung. p. 149 Pl. XXX f. 46. 



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



N. microrhynclms is according to Grunow related to N. Bidnheirnii, which I have placed 

 among the Microstigmatica:' because of its wider central strise and its, (somewhat indistinct) complex, 

 connecting zoue. N. microrhyiichu.s 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. hulophila Grun. (1881). — V. rhombic-lanceolate, subacute. L. O.05; B. 0,oi to 0,012 

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

 parallel. Longitudinal strite fine. — JV". cuspidata var. lialoph,. Grun. in V. H. Syn. p. 100 Suppl. 

 Pl. B. f. 30. N. protracta forma minor Pant. III Pl. XX f. 301 (1893)? 



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

 (Mansfelderseen)! France, Medoc! 



6. N. cuspidata Kutz. (1834). — V. rhombic-lanceolate, with acute ends. L. 0,o7 to 0,15; 

 B. 0,0 17 to 0,03 mm. Transverse strise 14 to 19, longitudinal 26 in 0,oi mm. — Bacillaria fiilva 

 NiTSZCH. p. p. 1817 (according to Kiitz.). .A^. fulva Donk. B. D. Pl. VI f. 9? Frustulia cuspidata 

 KtJTZ. Syn. Pl. II f. i^^. Nav. cuspidata KtiTz. Bac. p. 94 Pl. III f. 24, 37. W. Sm. B. D. I p. 47 

 Pl. XVI f. 131. Donk. B. D. p. 39 Pl. VI f. 6. Grun. Bänka D. Pl. II f. 16. Fresenius Senckenb- 

 Abh. IV Pl. IV f 18. Ströse Klicken f. 22. V. H. Syn. p. 100 Pl. XII f. 4. Nav. Reinickeana 

 Rabh. Alg. Sachs. N:o 802 (1859). Vanheurckia cu.^i^yidata Bréb. 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! 



