16 p. T. OLEVE, SYNOPSIS OK THE XAVK'ULOII) DIATOMS. - 



•24 ill 0,0 1 ram. 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, lA. 



Fresh water: Sweden! Finland! Ireland (Longh Monriie)! Doml)litton, fossil! Arctic Ame- 

 rica! Greenland! Michigan! New Zealand! 



Var. oregonica Cl. — Linear with broad, truncate ends. L. O.o-ir, ; P). (),(ii:5 mm. Strise 

 11 in 0,0 1 mm. — A. S. Atl. XLVII f. 55, 56 (without name). 

 Fresh water: Oregon, fossil! 



7. N. costnlata Grun. (1880). — V. rhombic-lanceolate, with acute ends. L. 0,oi.^> to 0,02; 

 B. 0,0045 to 0,00.-, mm. Axial area narrow; central area a transverse fa.scia. Stria; 8 to 10 in 

 ((,01 mm., slightly divergent in the middle, distant. Terminal .stritie not more strongly marked 

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

 p. 15(5 PI. XXX f. 45. 



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



8. N. Iniiig-arica Grun. (1800). — V. linear lanceolate, with broad, obtuse ends. L. O.oi.'i 

 to 0,(12; Br. 0,(10.-, to 0,006 mm. Axial area very narrow; central area small. Striae 8 to 9 in 

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

 on both sides of the terminal nodule one or two more strongly marked stria'. — Pinnnl. pyiim(ea 

 EnB. M. G. X: 1 f. 9 (1854). Nar. hmujurica Grun. Verb, "i860 p. 539 PI. Ill f. 30. Foss. D. 

 Cster. Ung. p. 156 PI. XXX f. 42. A. D. p. 27. 



Slightly brackish water: Gulf of Bothnia (Tornea)! Holstein! Franzen bad (fos.sil)! Neusiedler- 

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



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

 capit. Ehb. Ber. 1848 (accord, to Chase) M. G. XXXVII: .3 f. 9; XXXV A. I f. 4. Vinn. sic,nafa 

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

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

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



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



Var. liinehurgensis Grun. (1882). — V. lanceolate, with subacute ends. — Foss. D. Oster. 

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



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

 fossil)! Bombay (Grun.). 



The var. liinehurgensis is very similar to Nav. costnlata. Probably Gomphoicma naririt- 

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



9. N. ciiicta Ehb. (1854). — V. lineai'-lanceolate, with obtuse ends. L. 0,02 to 0,o.i; B. 0,oo.^) 

 to 0,006 mm. Axial area indistinct; centi-al area small, transverse. Striu' 12 to 17 in 0,oi mm. 

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

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

 V. H. Syn. p. 82 PI. VII f. 13, 14. F. Heuficri Pedicino Ischia PI. II f. 17. N. Kiitsingiana H. L. 

 Smith Am. Q J. 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! 

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



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

 10 in 0,01 mm. — Nav. Heuficri Grun. Verb. 1860 p. 528 PI. Ill f. 32. N. cincta v. Heufl. V. H. 

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



Fresh and brackish water: Sweden (Malino)! Belgium (V. H.), Tricst! Ecuador! 



