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



24 in 0,01 mm. forming longitudinal, fine rows. — KuTZ Bae. p. 92 Pl. III f. 43. V. H. Syn. 

 p. 88 Pl. VII f. 18. -A^. viridula forma major A. S. Atl. XL VII f. 53, 54. 



Fresh water: Sweden! Finland! Ireland (Loiigh Mourne)! Domblitton, fossil! Arctie Ame- 

 rica! Grreenland! Michigan! New Zealand! 



Var. oregonica Cl. — Linear with broad, troncate ends. L. 0, 09.5; B. O,oi.'i mm. Strise 

 11 in 0,01 mm. — A. S. Atl. XL VII f. 55, 56 (witliout name). 

 Fresh water: Oregon, fossil! 



7. N. costnlata Grun. (1880). — V. rliombic-lanceolate, with acute ends. L. 0,oi5 to 0,02; 

 B. 0,0045 to 0,00.5 mm. Axial area narrow; central area a transverse fascia. Striee 8 to 10 in 

 0,01 mm., sliglitly divergent in the niiddle, distant. Terminal strife not more strongly marked 

 than the others. — A. D. p. 27. V. H. Syn. p. 85 Suppl. A. f. 15. Geun. Foss. D. Öst. Ung. 

 p. 156 Pl. XXX f. 45. 



Slightly brackish water: Sweden (Gulf of Bothnia)! Holstein (Grnn.), Belgium (V. H.). 



8. N. luingaric.a Grun. (1860). — V. linear lanceolate, with broad, obtuse ends. L. 0,oi.'i 

 to 0,02; Br. 0,00!) to 0,oo(i mm. Axial area very narrow; central area small. Strite 8 to 9 in 

 0,01 mm., distant, slightly divergent in the middle and convergent in the ends, where there are 

 on both sides of the terminal nodnle one or two more strongly marked strife. — Pinnul. pygmfea 

 Ehb. M. g. X: 1 f 9 (1854). Nav. hungarica Grun. Verb. 1860 p. 539 Pl. III f. 30. Foss. D. 

 Öster. Ung. p. 156 Pl. XXX f. 42. A. D. p. 27. 



Slightly brackish water : Gnlf of Bothnia (Torneå) ! Holstein ! Franzenbad (fossil) ! Neusiedler- 

 see (Grun.), Dakota! Illinois! Ecuador! Argentina! 



Var. capitata Ehb. (1848). — V. gibbous in the middle and with subcapitate ends. — Finn. 

 capit. Ehb. Ber. 1848 (accord. to Chase) M. G. XXXVII: 3 f. 9; XXXV A. I f. 4. Finn. signata 

 Ehb. M. g. XXXIV 6 A. f. 7 (1854). Finn. garganica Eabh. Slissw. D. VI f. 41 (1853). Nav. 

 rnflata W. Sm. B. D. I Pl. XVII f. 158 (1853). Nav. glohiceps Lagst. Spitsb. D. p. 27 Pl. II f. 5 

 (1873). Nar. humilis Donk. B. D. p. 67 Pl. X f. 7 V. H. Syn. p. 85 Pl. XI f. 23. 



Fresh water: Beeren Eiland (Lagst.), Sweden; England! Belgium (V. H.). Japan! 



Var. lunehurgensis Grun. (1882). — V. lanceolate, with subacute ends. — Foss. D. Öster. 

 Ung. p. 156 Pl. XXX f. 43-44. 



Brackish water: Finmark (Tana Elf)! Holstein (Grun.), Germany (Domblitten, Oberrohe, 

 fossil)! Bombay (Grun.). 



The var. liinelurgensis is very similar to Nav. costulata. Probably Gomphoncma naricu- 

 loides Ströse Kliecken D. Pl. I f. 18 is this form. 



9. N. cincta Ehb. (1854). — V. linear-lanceolate, with obtuse ends. L. 0,02 to 0,(m ; B. 0,005 

 to 0,006 mm. Axial area indistinct; central area small, transverse. Stria^ 12 to 17 in 0,oi mm. 

 .strongly radiate in the middle, slightly convergent at the ends. The median sti'ia! are more 

 distant and more strongly marked than the others. — Finnul. cincta Ehb. M. G. X: 2 f. 6. iV^. cincfa 

 V. H. Syn. p. 82 Pl. VII f. 13, 14. F. Heuflcri Pedicino Ischia Pl. II f. 17. N. Kiihrugiana H. L. 

 Smith Am. Q .1. M. 1878 p. 13 f. 3. Finnul. nana Greg. accord. to Grun. A. S. N. S. D. II 

 f. 23, 24 (without name)? 



Fresh and brackish water: Sweden! Finland! Holstein! England! Belgium (V. H.), Bavaria! 

 Switzeiland! East ('ape! Japan! N. America, Kansas! Vancouver Island! 



Var. Jfeufleri Gkun. (1860). — L. 0,022 to 0,o;)2; B. 0, 004 mm. Central area small. Strise 

 K) in 0,01 mm. — Nav. Hcuflrri GlUiN. Verh. 1860 p. 528 Pl. III f. 32. N. cincfa v. Jlnifl. V. H. 

 Syn. p. 82 PL VII f. 12, 15. 



Fresh and brackisli water: Sweden (Malmö)! Belgium (V. H.), Triest! Ecuador! 



