126 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



. ( Frnstnie globose A. hyalina Ktjtz. 



\ — rectangular 5. 



/Divisions of the zone olose (10 in 0,0 1 mm.) A. lineolata Ehb. 



'I — — — less — (7 in 0,01 mm.) A. bacillaris Greg. 



„ ( Strise on the ventral side as close as on the dorsal side 7. 



I — — — — closer than — — — 8. 



_ ( L. 0,0.5 to 0,08 mm A. Arens Gebg. 



\ L. 0,13 to 0,26 mm A. rhombica Kitt. 



Strise of distant puncta (5 to 6 in 0,oi mm.) ' ..... A. mmandrina Cl. 



— — close — (10 to 12 in 0,oi mm.) 0. 



J Rows of puncta reaching to tho median line A. groenlandica Cl. 



' \ — — not — — - — A. aspera Pet. 



..„ j Striae oblique A. decussata Getjn. 



\ — transverse 11. 



{' 



^^ ■ Median line straight 12. 



— arcaate 15. 



^g f Median line close to the margin 13. 



distant from — 14. 



, f Median line 



M - - 

 I' 



,„ ■ Striffi of very distant puncta (4 to 5 in 0,01 mm.) A. micans A. S. 



not very distant puncta (10 in 0,01 mm.) A. acuta Greg. 



StrijE 14 to 17 in 0,oi mm., of distant puncta A. Lunula Cl. 



20 — — iinely punctate A. staurophora Cl. 



... , Strise coarsely punctate A. ostrearia Beéb. 



finely — A. Icevis Greg. 



1. A. lineolata Ehb. (1838). — Frustnle rectangular or elliptical with broad, truncate ends, 

 membranaceous. L. O, osa to 0,o4.'); B. 0,oi5 to 0, 02.3 mm. Zone with nnmerous divisions, 10 in 

 0,01 mm. Central nodule not dilated into a stauros. Dorsal part of the valve finely striate. 

 Stria; 20 to 23 in 0,oi mm. — Inf. Pl. XIV f. 4(?) Kutz Bac. p. 107 Pl. V f. 36. V. H. Syn. 

 p. 57 Pl. I f. 13, 23. A. S. Atl. XXVI f. 51. Ä. plicata Greg. T. M. S. V p. 70 Pl. I f. 31 

 (1857). A. S. Atl. XXVI f. 50. A. Bulnheimii Rabh. Alg. Eur. N:o 1,934 (1866). A. hyalina 

 H. L. Sm. Types N:o [614. A. sulcata Dannf. Baltic D. Pl. I f. 8 (1882). A. tenuis Flögel Pom- 

 merania Exp. p. 90 f. 13 (1873)? 



Brackish water: Sea of Kära! Coasts of Scotland, England and Sweden, Belgium! Baltic! 

 Saxony, Halle! Caspian Sea ((jrrnn.), Adriatic! Java! China! California! 



Var. chinensis A. S. (1875). — Frustnle with more convex margins. Central nodule slightly 

 transversely dilated. — A. chinensis A. S. Atl. XXVI f. 42. 



Marine: China. 



Var. undata H. L. Sm. (1873). — Frustule slightly constricted in the middle. L. 0,043; 

 B. 0,019 mm. Strise 21 in 0,oi mm. — A. undata H. L. Sm. Lens II p. 70 Pl. I f 21. 



Brackish water: Baltic at Westervik! New Haven Conn. Sm. 



According to H. L. Smith (Lens 1873 p. 74) Ehrbnberus name denotes partly A. ovalis and 

 partly another species. A. lineolata KtJTZ seems me to be this species, but A. lineolata Donk. is 

 another species, or Psainmamphora arenaria var. A. incurva Greg. (M. J. III p. 39 Pl. IV f. 5) 

 may represent detacbed valves of this or some other species, impossible to decide. A. tenera 

 W. Sm. (B. 1). I p. 20 Pl. XXX f. 252) may be a small form of A. lineolata or Cymbamphora 

 cymhclloidcs, impossible to decide without original specimens. Prof. Hamilton Smith believes it 

 to represent some Navicula. It seems questionable whether A. hi/pcrborea Grun. (Franz Josefs 

 Land D. p. 55 Pl. 1 f. 10, 1884) may be a variety of yl. lineolata, or belong to Navicula coniplanata. 



2. A. magnifica Grbv. (1863). — Frustule quadrate. L. 0,102; B. 0,1 4 mm. V. very 

 narrow. Median line arcuate. Zone with nnmerous divisions, about 4 in 0, 01 mm. dotted with 

 large siattercd puncta. - Edin. N. Ph. J. XVIII p. 1«2 f. 1. 



Marine: Queensland ((irev.). 



