KONGL. SV. VET. AKADEMIENS HANDLINGAE. BAND 26. N:0 2. 107 



fig. 7 in A. S. shews two longitudinal lines crossing the strife on each side of the median line, 

 "which suggests some aflfinity to Caloneis, if this character is not due to an optical illusion. 



6. N. lucida Pant. (1893). — V. narrow, lanceolate, subacute. L. 0,2; B. 0,022 mm. Axial 

 area very narrow, not dilated in the middle. Transverse striae 12 in 0,oi mm. almost parallel 

 throughout. — Pant. Ill PI. XVIII f. 264. 



Habitat? »Bodas» fossil (Pant.). 



Under the name N. inculta Pantocsek figures (III iPl. XIV f. 216) a similar, but smaller and 

 more finely striate form, with subrostrate ends. 



7. N. parallelistriata Pant. (1889). — V. linear, attenuated towards the broad, obtuse ends. 

 L. 0,069; B. 0,017 mm. Central pores approximate, terminal in contrary directions. Axial area 

 linear, narrow. Striae 17,5 in 0,oi mm. parallel. — Pant. II p. 52 PL II f. 26. 



Brackish water: Hungary, fossil (Pant.). 



8. N. heteroflexa Pant. (1889). — V. linear-lanceolate, with broad, rounded ends. L. 0,074 

 to 0,11; B. 0,011 to 0,013 mm. Median pores approximate; terminal in contrary directions. Axial 

 area very narrow, linear. Striae 22 (28 accord, to Pant.) in 0,oi mm. (the median shorter than 

 the others) radiate in the middle, parallel towards the ends. — Pant. II p. 47 PL II f. 34. 



Brackish water: Hungary, fossil! 



Var. constricta Pant. (1889). — V. slightly constricted in the middle, with cuneate ends. 

 L. 0,05 to 0,06; B. 0,oii to 0,012 mm. Striae 25 to 30 in 0,oi mm. — Pant. PL II f. 27, 33. 



Brackish water: Hungary, fossil (Pant.). 



Var. minor Pant. (1889). — V. linear-lanceolate. L. 0,o4 8; B. 0,oo9 5 mm. Striae 22 to 25 

 in 0,01 mm. — Pant. II PL IX f. 162. 



Brackish water: Hungary, fossil (Pant.). 



This species is one of the most remarkable Naviculae. Although in some respects divergent 

 from the rest of this group, especially by its radiate median striae, I have placed it here, as it 

 seems to be more akin to N. parallelistriata than to any other speeies. 



9. N. crassirostris Grun. (1880). — V. linear, with prolonged, rostrate and obtuse ends. 

 L. 0,048; B. 0,0073 mm. Median line with approximate central pores. Areas indistinct. Striae 

 transverse, 27 in 0,oi mm. — GrRUN. A. D. p. 45 PL III f. 57. 



Brackish water: Kara (Grrun.). 



Var. Maasoensis Grun. (1880). — More elongated and with narrower ends. Striae about 25 

 in 0,01 mm. — Grun. A. D. p. 46. 

 Marine: Finmark (Grun.). 



10. N. Lineola Grun. — (1884). — V. linear with rounded ends. L. 0,oi6 to 0,o5i; 

 B. 0,0025 to 0,003 mm. Central pores approximate. Striae extremely fine(?) — Grun. Franz Jos. 

 Land D. p. 104 (52) PL I f. 45, 46. 



Marine: Franz Josephs Land (Grun.). 



Var. perlepida Grun. (1884). — V. with somewhat constricted ends. L. 0,02 to 0,034; 

 B. 0,002 to 0,0033 mm. — N. perlepida Grun. Franz Jos. Land, D. p. 104 (52) PL I f. 44. 

 Marine: Franz Josephs Land (Grun.). 



Naviculse Ortliosticlise Cl. 



Valve usually elongated, lanceolate to linear. Median line with small or elongated central 

 nodule, sometimes transversely dilated into a stauros, and with small or indistinct terminal iissures. 



