KONGL. SV. VICT. AKADEMIENS HANDLINGAR. BAND 26. N:() 2. 107 



fig. 7 in A. S. sliews two longitudinal lines crossing the striaj on eauh aiclo of the median liiie, 

 which suggests some affinity 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 strite 12 in 0, 01 mm. almost parallel 

 throughout. — Pant. III Pl. XVIII f. 264. 



Habitat? »Bodas» fossil (Pant.). 



Under the name 3^. inculta Pantocsek figures (III Pl. 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. 0,0 17 mm. Central pores approximate, terminal in contrary directions. Axial area 

 linear, narrow. Strise 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. 0,0 74 

 to 0,1 1; B. 0,0 11 to 0,0 13 mm. Median pores approximate; terminal in contrary directions. Axial 

 area very narrow, linear. StriiE 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,oi2 mm. Strife 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. 0,048; B. 0, 0095 mm. Strite 22 to 25 

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



Brackish water: Hungary, f'os.sil (Pant.). 



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

 from the rest of this group, especially by its radiate median strite, 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. Strise 

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



Brackish water: Kära (Grun.). 



Var. Maasöensis Grun. (1880). — More elongated and with narrower ends. Strite about 25 

 in 0,01 mm. — Grun. A. D. p. 46. 

 Marine: Finmark (Grun.). 



10. N. Lineola (xrun. — (1884). — V. linear with rounded ends. L. 0,oi6 to 0,05i; 

 B. 0,0025 to 0,003 mm. Central pores approximate. Strife 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. perlcpida Grun. Franz Jos. Land, D. p. 104 (52) Pl. I f. 44. 

 Marine: Franz Josephs Land (Grun.). 



Naviculse Orthosticliae 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 fissures. 



