KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 111 



Xil p. 290 (according to V. H. Syn.). V. H. Syn. p. 68 Pl. IV f. 9. Stam: hyalina Dannf. Balt. 

 D. p. 32 Pl. III f. 20 (1882)? 



Marine and braekisli water: Arctic America! Cape Wankarema! Sea of Kära! England 

 (V. H. T.). 



11. N. crucigera W. Sm. (1856). — V. narrow lanceolate, witli acute ends. L. 0,08 to 

 0,11; B. 0,01 mm. Central nodule dilated to stauros, reaching the margin. Transverse striee 12, 

 longitndinal 25 to '1?> in fl, 01 mm. Frustule free or enclosed in gelatinous tiibes. — Schizonema 

 crnc. W. Sm. B. D. II p. 74 Pl. LVI f. 354; LVII f. 356. V. H. Syn. p. 110 Pl. XVI f. 1. 



Marine: and hrackish water: Gnlf of Bothnia! Firth of Tay! BoluLslän! Month of Loire 

 (Gnin.), Saxony (salines of Diirrenberg) ! 



N. crucigera, which occurs in gelatinous tnbe.s and for tbat reason has been regarded as a 

 Scliizonema, is closely connected with N. Spiciän, which (ahvays?) occurs free. The striation is 

 mucli coarser in N. crticigera than in N. Spicula. 



12. N. balearica Cl. (1881). — V. narrow lanceolate, with acute ends. L. 0,ii; B. 0,oi3 

 mm. Central nodule dilated to a short stauros. Transverse strife 26, longitndinal 23 in 0, 01 mm. 

 — Sfauroneis balear. Cl. N. R. D. p. 14 Pl. ni f. 41. 



Marine: Balearic Islands! 



13. N. quarnerensis Grun. Ms. — V. membranaceous, linear-lanceolate, gradually tapering 

 from the middle to the subacute ends. L. 0,i4; B. O, o 2 mm. Central nodule small, transversely 

 dilated to a very narrow stauros, reaching half way to the margins. Transverse strise 24, longi- 

 tndinal 18 to 20 in 0,01 mm. — Pl. III f. 14. 



Marine: Adriatic (Grun.), Seychelles (V. H. CoU.)! Sumatra (Deby Coll.)! 



Grunow has sent me a sketch of this diatom with the name Sfauroneis quarnerensis. As 

 it evidently belongs to this group I have changed the name to Navicula quarii. It is true that 

 this name has been used by Grcnow for an other form, but as that is probably identical with 

 N. cuspidafa var. ambigua, I think it admissible to use the name N. quarnerensis for this species. 



14. N. Yitrea Cl. (1880). — V. narrow lanceolate acute. L. 0, 15 to 0,2. B. 0,22 mm. 

 Transverse strite 19 to 20, longitndinal 21 in 0, 01 mm. — Pleurosigma vitrea Cl. A. D. p. 15 

 Pl. IV f. 78. Grun. A. D. p. 60. Péragallo Pleur. VIII f. 9. 



Marine: Sea of Kära! Cape Wankarema! Adriatic (Grun.). 



15. N. 0'Meaiii Grun. (1880). — V. narrow-lanceolate, with rounded ends. L. 0,or>9 to 

 0,068; B. 0,009 to 0,01 i.i mm. Transverse strite 17; longitudinal 19 in 0, 01 mm. — Grun. A. D. 

 p. 61. Cl. Vega p. 496. Pleur. ffM. Pérag. Pleur. VIII f. 10. 



Marine: Seychelles (Grun.), Australia (Grun.). 



Var. minor Cl. (1883). — L. O, os; B. O,oii mm. Transverse striaä slightly radiate, 16 in 

 0,01 mm. Longitudinal stritB 18 in O.oi mm. — Cl. Vega p. 496. 

 Marine: Port Jackson! 



16. N. Kjellmaiiii Cl. (1880). — V. linear lanceolate, with subacute ends. L. O, les; 

 B. 0,026! mm. Transverse strise 15 in 0, 01 mm.; longitudinal of equal number, slightly inflexed 

 towards the central nodule. — Pleurosigma (Nav.?) Kjelhn. Cl. A. D. p. 14 Pl. IV f. 80. Pleur. 

 Kjellm. Pérag. Pleur. Pl. VIII f. 8. Nar. Vegce. Cl. Vega p. 474. 



Brackish water: Sea of Kära. 



Var. siihconstricta Grun. (1883). — V. linear, slightly constricted in the middle, with sub- 

 cuneate ends. L. 0,i56; B. 0,oi5 mm. Transverse striee 15,3; longitudinal 14,3 in 0, 01 mm. — 

 Nar. Vega v. subc. Vega p. 474. - 'f/ib' ^r 



Marine: North Siberian Sea, Cape Wankarema (Grun.). 



N Kjelhnanii, 0'Mearii and vitrea are closely connected and form a peculiar group inter- 

 mediate between Gyrosigma and Navicula, having the structure of the former and the straight 



