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



. ( Frnsi 



Frnstnle globose ... -A. hyalina KtJTz. 



rectangular . . . . 5. 



p. I Divisions of the zone close (10 in 0,0 1 mm.) . .A. lineolata Ehb. 



' ( — — — less — (7 in 0,oi mm.) A. bacillaris Gbbg. 



„ i Striae on the ventral side as close as on the dorsal side . . . . . . 7. 



I — — — — closer than — — — . . 8. 



_ I L. 0,0 6 to 0,08 mm. . . ... . . A. Arcus Gebg. 



\ h. 0,13 to 0,26 mm ... -A. rhomhica Kitt. 



„ ( Striffi of distant puncta (5 to 6 in 0,0 1 mm.) . . A. maandrina Ol. 



■ \ — — close — (10 to 12 in 0,01 mm.) . .... 9. 



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



' \ — — not — — - — . . . . A. aspera Pet. 



..„ J Striae oblique .... . .A. decussata Grtjn. 



\ — transverse . . . . . . . . . 11. 



.. ., f Median line straight .... 12. 



' \ — — arcuate . . 15. 



ian line close to the margin 13. 



12. 



distant from — . . 14 



..„ 1 Striae of very distant puncta (4 to 5 in 0,oi mm.) . A. micans A. S. 



\ — not very distant puncta (10 in 0,oi mm.) . . A. acuta Gebg. 



I . j Striae 14 to 17 in 0,oi mm., of distant puncta . A. Lunula Cl. 



( Media 



1 Striffi 



f Striae , , , 



\ - 20 — — finely punctate ... . . A. staurophora Cl. 



.., ( Striae coarsely punctate . A. ostrearia Bk^^b. 



\ — finely — . A. Iwvis Gbbg. 



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

 membranaceous. L. 0,o32 to 0,04.^; B. 0,oi5 to 0,023 mm. Zone with numerous divisions, 10 in 

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

 StriiB 20 to 23 in 0,oi mm. — Inf. PL XIV f. 4(?) KtJTZ Bac. p. 107 PL V f. 36. V. H. Syn. 

 p. 57 PL I f. 13, 23. A. S. AtL XXVI f. 51. A. 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 1614. A. sulcata Dannf. Baltic D. PL I f. 8 (1882). A. tenuis Flogel Pom- 

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



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

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



Var. chinensis A. S. (1875). — Erustule 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. 0,04 3; 

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



Brackish water: Baltic at Wester vik! New Haven Conn. Sm. 



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

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

 another species, or Psammamphora arenaria var. A. incurva Greg. (M. J. Ill p. 39 PL IV f. 5) 

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

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

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

 to represent some Navicula. It seems questionable whether A. hyperborea GauN. (Franz Josefs 

 Land D. p. 55 PL 1 f. 10, 1884) may be a variety of A. lineolata, or belong to Navicula complanata. 



2. A. magniiica Grev. (1863). — Frustule quadrate. L. 0,102; B. 0,i4 mm. V. very 

 narrow. Median line arcuate. Zone with numerous divisions, about 4 in 0,oi mm. dotted with 

 large scattered puncta. — Edin. N. Ph. J. XVIII p. 182 f. 1. 



Marine: Queensland (Grev.). 



