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



median stri» of unequal length. — T. M. S. IV p. 40 Pl. V f. 4, 4*. Ralfs in Pritch Inf. VII 

 f. 70. A. S. N. S. D. I f. 30. Atl. VI f. 7. Donk. B. D. p. 17 Pl. III f. 2. Pant. III Pl. XLI 

 f. 568. Pinnul divaricata 0'Mbara M. J. VII p. 116 Pl. V f. 7 (1867). 



Marine: Finmark! North Sea! Naples! Sebastopol! Ceylon! China! Japan! Htingary, foss.! 



Var. capitata Pant. (1889). — V. with capitate ends. L. 0,io9; B. 0,o48 mm. Strise 10,5 

 in 0,01 mm. — Pant. II p. 49; III Pl. XXXII f. 461. 



Marine: Hungary, fossil (Pant.). 



Var. minor Pant. (1889). — V. elliptic-elongated, with capitate ends. L. 0,o7 5; B. 0,o3 

 mm. Strise 10,5 in 0,oi mm. — Pant. II p. 49. 



Marine: Hungary, fossil (Pant.). 



Var. elongata Pant. (1889). — V. elliptic-lanceolate. L. 0,i4; B. 0,0 6 mm. Strife 10 to 11 

 mm. Puncta 10 to 11 in 0,oi mm. — N. humerosa v. elongata Pant. II p. 48 Pl. X f. 175. 



Marine: Hungary, fossil: 



21. N. Alpha Cl. (1893). — V. broadly lanceolate, with obtuse, subrostrate ends. L. 0,o62; 

 B. 0,0 3 mm. Median line with incrassate central pores, and the terminal fissures turned in contrary 

 directions. Striae 7 in 0,oi mm., a little closer at the ends (9 in 0,oi mm.), radiate, coarsely 

 punctate; puncta 8 in 0,oi mm. Median striee of unequal length. — Diatomiste II p. 13 Pl. I f. 4. 



Marine: Japan! 



22. N. Jentzschii Grun. (1882). — V. elliptical, with rounded ends. L. 0,oi7 to 0,02; 

 B. 0,009 to 0,0 u 5 mm. Axial and central areas indistinct. Strise 8 or 10 (middle) to 12 or 16 

 (ends) in 0,oi mm., frequently closer on one side of the valve, radiate throughout, punctate; puncta 

 22 in 0,01 mm. — Foss. D. Österr. Ung. p. 156 Pl. XXX f. 64. 



Fresh or slightly brackish water: Domblitten, fossil (Grun.), Finland, Abo! Sweden, Mäla- 

 ren! Gulf of Bothnia! 



This species seems to connect the] Punctatce with iV. lucidula and N. Atomiis among the 

 MinusculcB. 



23. N. torneeusis Cl. (1891). — V. lanceolate, with obtuse ends. L. 0,017 to 0,024; B. 0,oo8 

 to 0,01 mm. Axial area indistinct, central area small. Strise 14 in 0, 01 mm., radiate at the ends, 

 coarsely punctate; puncta about 14 in 0,oi mm. — D. of Finl. p. 33 Pl. II f. 6. 



Slightly brackish water: Gulf of Botbnia (Torneå, Piteå)! 



Var. aboensis Cl. (1881). — V. elliptical. L. 0,012; B. 0,oo8 mm. — 1. c. f. 7. 



Fresh water: Finland, Lake Lojo near Åbo! 



24. N. lacnstris Greg. (1856). — V. lanceolate, with subacute or subrostrate ends. L. 0,035 

 to 0,055; B. 0,016 to 0,018 mm. Axial area narrow; central area small, but distinct, orbicular. 

 Terminal fissures seem to be turned in contrary directions. Strise 14 to 16, radiate at the ends, 

 distinctly punctate; puncta about 18 in 0,oi mm., larger near the areas. — M. J. IV Pl. I f. 23. 

 Cl. D. of Finl. p. 34 Pl. II f. 14. 



Fresh water: Scotland, Loch Leven! Lule Lapmark! Finland! Germany, Oberrohe! Canada, 

 Port Hope! 



25. N. Toiilaae Pant. (1893). — V. lanceolate. L. 0,o56; B. 0,021 mm. Axial area in- 

 distinct. Central area small, rounded. StritB 10 in 0, 01 mm. radiate throughout, composed of 

 somewhat elongated puncta (9 in 0, 01 mm.) arranged in almost straight longitudinal rows. Median 

 strise shortened. -- Pant. III Pl. XII f. 196. 



Fresh water?: Hungary, Köpecz (Pant.). 



26. N. Gaiuina Cl. (1893). — V. lanceolate, with subrostrate ends. B. 0,o36; B. 0,oi4 mm. 

 Terminal fissures in contrary direction. Axial area indistinct; central area large, orbicular or 



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