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



globose A. 



rectangular 5 



. I Frustale globose A. hyalina Kutz. 



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



"' 1 — — less — (7 in 0,oi mm.) A. bacillaris Gbeg. 



„ I StrisB ou the ventral side as close as on the dorsal side 7. 



_ I L. 0,0.5 to 0,08 mm A. Arcus Greg. 



^^ , StricB of distant puncta (f^ to t) in ll.oi inm.) A. ma'andrina Cl. 



8. ^ 



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



closer than 



1 L. 0,13 to 0,26 mm A. rhonibicn Kitt. 



\ — — close (10 to 12 in U,oi mm.) !l. 



I — — not — — - — A. aspera Pet. 



j Striae oblique A. decussata Grun. 



I 



2. [ 



\ — — distant from — 14. 



, I Strise 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 Greg. 



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



1 20 — — finely punctate A. staurophora Cl. 



10- > f 11 



transverse 11 



11 



Median line straight 12. 



— arcuate 15. 



..,, I Median line close to the margin 13 



... j Striae coarsely punctate A. osfrearia Breb. 



' \ — finely — . . A. lavis Greg. 



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

 membranaceous. L. 0,();<o to 0,u45; B. O,oi,'i to 0,o2.3 mm. Zone with numerous divisions, 10 in 

 0,0 1 mm. Central nodule not dilated into a stauros. Dorsal part of the valve finely striate. 

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

 p. 57 PI. I f. 13, 23. A. S. Atl. XXVI f. 51. A. pUcata (Ireg. T. M. S. V p. 70 PI. I f. 31 

 (1857). A. S. Atl. XXVI f. 50. A. BidnheimH Rabh. Alg. Eur. N:o 1,934 (1866). .4. hyalina 

 H. L. Sm. Types N:o i614. A. sulcata Dannf. Baltic D. PL I f. 8 (1882). .4. 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 (drun.), Adriatic! Java! China! California! 



Var. chiricnsis A. S. (1875). — Frustule with more convex margins. Central nodule slightly 

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



Marine: China. 



Var. iDidata H. L. Sm. (1873). — Frustule slightly constricted in the middle. L. 0,o4.3; 

 B. 0,0 19 mm. Strice 21 in 0,oi mm. — A. niuhifa H. L. Sm. Lens II p. 70 Pi. I f. 21. 



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



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

 partly another species. A. lineolata Ktixz seems me to be this species, but .4. 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. I). I p. 20 PL XXX f. 252) may be a small form of A. lineolata or Gymhamphora 

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

 to represent some Navicula. It seems questionable whether A. Iiypcrhorea Grun. (Franz Josefs 

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



2. A. magnifica 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.). 



