16 p. T. CLEVE, SYNOPSIS OF THE NAVirULOID DIATOMS. 



24 in 0,01 mm. forming longitudinal, fine rows. — KtJTZ Bac. p. 92 PI. Ill f. 43. V. H. Syn. 

 p. 83 PI. VII f. 18. N. viridula forma major A. S. Atl. XLVII f. 53, .54. 



Fresh water: Sweden!- Finland! Ireland (Lough Mourn e)! Domblitton, fossil! Arctic Ame- 

 rica! Greenland! Michigan! New Zealand! 



Var. oregonica Cl. — Linear with broad, truncate ends. L. 0,09 5; B. 0,oi.3 mm. Strise 

 11 in 0,01 mm. — A. S. Atl. XLVII f. 55, 56 (without name). 



Fresh water: Oregon, fossil! 



7. N. costulata (Jrun. (1880). — V. rhombic-lanceolate, with acute ends. L. 0,oi5 to 0,02; 

 B. 0,0045 to 0,003 mm. Axial area narrow; central area a transverse fascia. Strise 8 to 10 in 

 0,01 mm., slightly divergent in the middle, distant. Terminal strise not more strongly marked 

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

 p. 15fi PL XXX f. 45. 



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



8. N. hungarica Grun. (1860). — V. linear lanceolate, with broad, obtuse ends. L. 0,oi5 

 to 0,02; Br. 0,005 to 0,006 mm. Axial area very narrow; central area small. Strise 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 nodule one or two more strongly marked strise. — Pinnul. pygmcsa 

 Ehb. M. G. X: 1 f. 9 (1854). Nav. hungarica Grun. Verh. 1860 p. 539 PL III f. 30. Foss. D. 

 Oster. Ung. p. 156 PL XXX f. 42. A. D. p. 27. 



Slightly brackish water: Gulf of Bothnia (Tornea)! 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. XXXVIl: 3 f. 9; XXXV A. I f. 4. Finn, signata 

 Ehb. M. G. XXXIV 6 A. f. 7 (1854). Finn, garganica Rabh. Stissw. D. VI f. 41 (1853). Nav. 

 inflata W. Sm. B. D. I PL XVII f. 158 (1853). Nav. globiceps Lagst. Spitsb. D. p. 27 PL II f. 5 

 (1873). Nav. humilts 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. lUneburgensis Grun. (1882). — V. lanceolate, with subacute ends. — Foss. D. Oster. 

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



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

 fossil)! Bombay (Grun.). 



The var. lUneburgensis is very similar to Nav. costulata. Probably Goniphonema navicu- 

 loides Strose Kliecken D. PL I f. 18 is this form. 



9. N. cincta Ehb. (1854). — V. linear-lanceolate, with obtuse ends. L. 0,02 to 0,04; B. 0,oo5 

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

 strongly radiate in the middle, slightly convergent at the ends. The median strise are more 

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

 V. H. Syn. p. 82 PL VII f. 13, 14. P. Heufleri Pedicino Ischia PL II f. 17. N. Kutdngiana H. L. 

 Smith Am. Q J. M. 1878 p. 13 f. 3. Pinnul. 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! 

 Switzerland! Bast Cape! Japan! N. America, Kansas! Vancouver Island! 



Var. Heufleri Grun. (1860). — L. 0,022 to 0,032; B. 0,oo4 mm. Central area small. Strise 

 10 in 0,01 mm. — Nav. Heufleri Grun. Verh. 1860 p. 528 PL III f. 32. N. cincta v. Heufl. V. H. 

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



Fresh and brackish water: Sweden (Malmo)! Belgium (V. H.), Triest! Ecuador! 



