KONGL. SV. VET. AKADEMIENS HANDLINGAE. BAND 26. N:0 2. Ill 



XII p. 290 (according to V. H. Syn.). V. B.. Syn. p. 68 PI. IV f. 9. Staur. hyalina Dannf. Bait. 

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



Marine and brackish water: Arctic America! Cape Wankarema! Sea of Kara! England 

 (V. H. T.). 



11. N. crucigera W. Sm. (1856). — V. narrow lanceolate, with acute end.s. L. 0,o8 to 

 0,1,1 ; B. 0,01 mm. Central nodule dilated to stauros, reaching the margin. Transverse strise 12, 

 longitudinal 25 to 28 in 0,oi mm. Frustule free or enclosed in gelatinous tubes. — Sehizonema 

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



Marine: and brackish water: Gulf of Bothnia! Firth of Tay! Bohuslan! Mouth of Loire 

 (Grun.), Saxony (salines of Dllrrenberg)! 



N. crucigera, which occurs in gelatinous tubes and for that reason has been regarded as a 

 Schisonema, is closely connected with N. Spiculn, which (always?) occurs free. The striation is 

 much coarser in N. crucigera than in N. Spicula. 



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

 mm. Central nodule dilated to a short stauros. Transverse strise 26, longitudinal 23 in 0,oi mm. 

 — Stauroneis balear. Cl. N. R. D. p. 14 PI. ni f. 41. 



Marine: Balearic Islands! 



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

 from the middle to the subacute ends. L. 0,i4; B. 0,02 mm. Central nodule small, transversely 

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

 tudinal 18 to 20 in 0,01 mm. — PI. Ill f. 14. 



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



Gkunow has sent me a sketch of this diatom with the name Stauroneis quarnerensis. As 

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

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

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



14. N. vitrea Cl. (1880). — V. narrow lanceolate acute, L. 0,i5 to 0,2. B. 0,22 mm. 

 Transverse strise 19 to 20, longitudinal 21 in 0,oi mm. — Pleurosigmd vitrea Cl. A. D. p. 15 

 Pi: IV f. 78. Grun. A. D. p. 60. Pi^ragallo Pleur. VIII f. 9. 



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



15. N. O'Mearii Grun. (1880). — V. narrow-lanceolate, with rounded ends. L. 0,0 5 9 tq 

 0,068; B. 0,009 to 0,ou5 mm. Transverse strise 17; longitudinal 19 in 0,oi mm. ^- Grun. A. D. 

 p. 61. Cl. Vega p. 496- Pleur- O'M. P^rag. Pleur. VIII f. 10. 



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



Var. minor Cl. (1883). — L. 0,o5; B. 0,oii mm. Transverse strise slightly radiate, 16 in 

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

 Marine; Port Jackson! 



16. N. Kjellmanii Cl. (1880). — V. linear lanceolate, with subacute ends. L. 0,i68; 

 B. 0,0264 mm. Transverse strise 15 in 0,oi mm.; longitudinal of equal number, slightly inflexed 

 towards the central nodule. — Fleurosigma (Nav.?) Kjellm. Cl. A. D. p. 14 PI. IV f. 80. Fleur. 

 Kjellm. P^RAG. Pleur. PI. VIII f. 8. Nav. Vegce Cl. Vega p. 474. 



Brackish water ^ Sea of Kara. 



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

 cuneate ends. L. 0,i56; B. 0,oi5 mm. Transverse strise 15,3; longitudinal 14,3 in 0,ormm. ^-r 

 Nav. Vegce v. subc-. Vega p. 474. 



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



N. Kjellm&kii, O'Mearii and vitrea are closely connected and form a peculiar group inter-i 

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



