84 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Forma minuta. — L. 0,035; B. 0,oi4; at the constr. 0,oi3 mm. Costse 13 in 0,oi mm. 



Marine: Madagascar! 



Var. distans Cl. — Horns of the central nodule divergent. 



Marine: Norway! (L. 0,052; B. 0,02; constr. 0,oi8 mm. Costse 9 in 0,oi mm.) Hungary, 

 Szakal! (L. 0,04; B. 0,oi6 constr. 0,oi5 mm. Costaj 10 in 0,oi mm.) Galapagos Islands! (L. 0,032; 

 B. 0,013; constr. O,oii mm. Costse 12 in 0,oi mm.). 



19. D. incurvata Greg. (1856). — V. elongated, panduriform. L. 0,o6 to 0,o7; B. 0,oi3 to 

 0,017; constr. 0,01 to 0,oi2 mm. Central nodule small, quadrate; its horns parallel. Furrows broad, 

 'linear, not costate or punctate. Costse 11 to 12 in 0,oi mm., parallel, slightly radiate at the ends. 



— Nav. inc. Greg. T. M. S. IV p. 44 PL V f. 13. Donk. B. D. p. 49 PL VII f. 4. A. S. N. 

 S. D. PL I f. 10, 11; II f. 6. 



Marine: Finmark! North Sea! Morocco! Florida! Galapagos Islands! Cape of Good Hope! 



20. D. interrupta Kutz (1844). — V. deeply constricted, its segments broadly elliptical to 

 orbicular, with rounded ends. L. 0,029 to 0,072; B. 0,oi2 to 0,024; at the constr. 0,oo 7 to0,oi3 mm. 

 Central nodule elongated, quadrate, its horns parallel. Furrows linear, narrow. Costse 8 to 12 in 

 0,01 mm., divergent, usually interrupted or not reaching the margin in the middle of the valve. 



— Nav. interr. KiJTZ Bac. p. 100 PL XXIX f. 93. Donk. B. D. p. 47 PL VII f. 2. Grun. Verh. 

 1860 p. 531 PL V f. 20. Lagst. Spitsb. D. p. 28 PL II f. 6. A. S. N. S. D. PL I f. 8. Atl. Xn 

 f. 3, 4, 5, 11; LXIX f. 24. V. H. Syn. p. 89 PL IX f. 7, 8. Diploneis didyma Ehb. Abh. Berl. 

 1870 PL II f. 13. W. Sm. B. D. XVII f. 154 a'. Nav. Fiiella A. S. Atl. LXIX f. 25. Nav. interr. 

 V. Novae, ZealandicB A. S. Atl. XII f. 12. 



Brackish w^ater: Spitzbergen! Beeren Eiland (Lagst.), Kara! Finmark! North Sea! Baltic 

 (Tornea to Rugen)! Mediterranean Sea! Eed Sea (Grun.), Java! Samoa! Australia! Auckland (Grun.), 

 Cape Good Hope (Atl.), Atlantic coast of America! Greenland! Arctic America! Franzenbad! Halle! 

 Great Salt Lake! 



Var. Tallyana Grun. (1882). — Costse interrupted in the middle, outside the furrow. — 

 Nav. interr. v. Tall. Grun. F. D. Ost. Ung. p. 150 PL XXX f. 59. 



Brackish water: Tallya, Hungary, fossil (Grun.). 



Var. zanziharica Grun. (1875). — V. deeply constricted. L. 0,o5 to 0,07; B. 0,02 to 0,033; 

 at the constr. 0,oo9 to 0,oi7 mm. Segments nearly orbicular. Horns of the central nodule diver- 

 gent. Costse 7 to 8 in 0,oi mm. (according to A. S. Atl. alternating with rows of puncta). — 

 Nav. interr. v. zanz. A. S. Atl. XII f. 1, 2. 



Brackish and marine: Zanzibar (Atl.), Carpentaria, Australia (Atl.). 



Var.? Weisneri Pant. (1886). — V. less constricted. L. 0,021 to 0,032; B. 0,oi to 0,oi4; at 

 the constr. 0,oi2 mm. Segments tongue-shaped. Horns somewhat divergent. Costse 10 to 12,5 in 

 0,01 mm. — Nav. Weisneri Pant. I p. 29 PL XVIII f. 158. Nav. interr. var. fossilis Pant. II 

 p. 48 PL VI f. 112; PL XII f. 208, 215 (1889). 



Brackish water: Hungary fossil! 



Var.? Gorjanovicii Pant. (1886). — V. gently constricted, with elliptical segments. L. 0,022 

 to 0,036; B. 0,012 to 0,014; at the constr. 0,oo7 to 0,oo9 mm. Horns slightly divergent. Costse 

 8 to 12,5 in 0,01 mm. not interrupted in the middle. — Nav. Gorjanovicii Pant. I p. 25 PL IX 

 f. 81. Nav. Heerii Pant. II p. 47 PL XI f. 195; PL XII f. 210 (1889). ?Nav. Gorjanov. var. major 

 Pant. II p. 46 PL V f. 78.? Nav. suspecta? var. Gzekehazensis Pant. II p. 44 PL IV f. 56. 



Brackish water: Hungary, fossil (Pant.)! 



Var. clancula A. S. (1875). — V. deeply constricted, with almost orbicular segments. L. 0,o36; 

 B. 0,018, at the constr. 0,oo9. Costse 8 to 9 in 0,oi mm. not interrupted in the middle — Nav 

 clanc. A. S. Atl. XII f. 33, 34. 



Marine: Australia (Atl.). 



