140 F. T. CLEVE, SYXOPSIS OF THE NAVICUEOID DIATOMS. 



central areas indistinct. .Stritt' alxmt l(i in O.di mm. tlie median stronger and more distant, very 

 slightly radiate, at tlie ends parallel. all tineh' puuctate. — Siauroncin Cntciaila W. Sm. B. D. 

 I p. 60 Pl. XIX f. 192. Ldt. Spitsb. i), p. 37 " Pl. 11 f. U. K cruc. Doxk. B. D. p. 44 Pl. VI 

 f. 14. V. H. Syn. p. 9li Pl. X f. 15. Stauronew clilatata W. Sm. B. IJ. 1. u. f. llil'/ 



Brackish water: Spitsbergen! Baltic! Coasts of the North Sea (Swedeul England! Belgium 

 V. H.), Atlantic coasts of North America! 



Var. obtitsufa Grun. (1880). — Smaller, broadly lanceidate, witii rounded obtuse ends. L. 

 0,025 to 0,05; B. 0,0 1 to (),oib mm. Striu' 17 in 0,ui mm. — A'at'. Cructc. car. oht. Grux. A. L). 

 p. 35 Pl. II f. 37. 



Brackish water: Grnn. 



Var. mbudd Grix, (1860). — V. broadly lanceolate, with slightly rostrate ends. — L. 0,02; 

 B. 0,01 mm. StricB 19 in 0, 01 mm. — Staur. Crucicula var. minuta Grun. Verh. 1860 p. 567 

 Pl. VI f. 15. 



Marine: Adriatic (Grnn.). 



7. N. gibbiila Cl. N. Sp. — V. linear, slightl}' gibbous in the middle. with broad, truncate 

 ends. L. 0,o3:! to 0,043; B. 0,oo85 to 0, 01 mm. Axial area indistinct. Central area verj" small, 

 i'ounded. Striee 16 (middle) to 21 (ends) radiate in the middle, where they are of eqnal length, 

 slightly radiate in the ends, distinctly punctate, puncta (about 22 in O.oi mm.) forming longi- 

 tiidinal rows. — N. gihbcrula Lägst. Spitsb. D. p. 30 Pl. I f. 7 (1873). — A^. gibhulu Icon. n. Pl. "\' f. 17. 



Fresh water (moist earth etc): Spitsbergen! Beeren Eiland (Ldt.). 



Var. ohlonga Lägst. (1873). — V. linear not gibboiis in the middle. — Xac. rjibberula car- 

 obJonga Lagst. 1. c. p. 31. 



Fresh water: Spitsbergen (Lagst.). 



Var. capitafa Lagst. (1873). — V. strongly gibbous in the middle. with dilated, rounded 

 truncate ends. — A^. gibberida car. capilaia Lagst. 1. c. p. 31 Pl. I f. 7 «'. 



Fresh water: Spitsbergen (Ijagst.), Beeren Eiland (Lagst.). 



8. N. Limdströniii Cl. (1880). — V. linear-lanceolate, with subrostrate, broad ends. L. 0,034 

 to 0,05 1; B. 0,011 to 0,0 13 mm. Median line with the terminal fissures in the same direction. 

 Axial area narrow, slightly dilated aronnd the central nodule. Stria? 16 (middle) to 20 (ends) in 

 0,01 mm., radiate throughout, finely punctate, in the middle of equal length. — Cl. A. D. p. 13, 

 36, Pl. 11 f. 39. 



Brackish water: Sea of Kära (Jamal)! 



Var. Friesenna Grun. (1879). — V. with broad rostrate-capitate ends, slightly as^^mmetrical. 

 L. 0,032 to 0,048; B. 0,012 to 0, 015 mm. Stria?, 16 to 18 in 0, 01 mm. (middle) or 20 to 22 in 0,oi 

 mm. at the ends, in the middle radiate and of equal length, at the ends radiate, distinctly piinctate, 

 puncta (about 20 in 0, 01 mm.) forming undulating longitudinal rows. — Ci/iiibdht Frieseana Grux. 

 in Cl. M. I). N:o 261. Icon. n. Pl. V f. 18. 



Brackish water: Finmark (Tana Elf)! 



9. N. prolracta (jrun. (1880). — V. linear, with rostrate and truncate ends. L. 0,022 to 

 0,035; B, 0,008 to 0,01 mm. Axial area very narrow; central very small. Stria; 12 (middle) to 20 

 (ends) in 0, 01 mm., slightly radiate in the middle, transverse at the eiuls, coarsel}- punctate, puncta 

 about 17 in 0,oi mni. — X. (Jriu: car.':' prof. Grun. A. D. p. 35 PL II f. 38. V. H. Syn. p. 96 

 Suppl. Pl. B f. 27. Foss. I). Öster. Ung. j). 146 Pl. XXX f. 47. A. Troglndgivs Pant. II p, 54 

 Pl. XI f. 184 (1889)? 



Brackish water: Salines of the mainland of Europé (Grun.), Belgium (V. H.), Hungary, 

 foss. (Pant.) — Cameroon! 



Var. maxhua Cl. — L. 0,o8; B. 0,oi6 mm. Stria; about 14 to 15 in O.oi mm. 

 Fresh water: Rio Purus, Br'azil (Deby CoU.)! 



