KONGL. SV. VET. AKADBMIENS HANDLINGAR. BAND 26. N:0 2. 127 



Var. maxima H. L. Smith (1886). — L. 0,3?; B. 0,04 mm. Forks 0,oi mm. Striee 32 in 

 0,01 mm. — A. maxima "Walkek and Chase N. R. D. p. 2 PI. II f. 5. 



Fresh water: Oregon, fossil. 



Var. Truani V. H. — V. fusiform, acute. L. 0,26; B. 0,023 mm. Forks 0,oo6 mm. Terminal 

 nodules elongated. Transverse and longitudinal striae 26 in 0,oi mm. — A. Lindheimeri var. Truani 

 V. H. T. N:o 166. Truan D. Astur. PI. II f. 34, 35 (according to De Toni). A. pell. var. Tr. 

 Icon. n. PI. VI (Part. II PL I) f. 1. 



Fresh water: Spain! 



Var. recta Kitton (1-884). — V. linear, with gently cuneate ends. L. 0,226; B. 0,oi9 mm. 

 Forks 0,0 5 mm. Terminal nodules elongated. Striis 26 in 0,oi mm. — Kitton J. Quekett M. C. 

 (2) 11 p. 21 PI. IV f. 4. 



Marine: Japan (Kitton). 



Var. Schumannii Grun. (1877). — L. 0,i8 to 0,02; B. 0,oi4 mm. Strige 16 in 0,oi mm. — 

 A. pellucida Schum. Preuss. 1). II N. p. 53 PL I f. 9. A. Schum. Grun. T. R. M. S. 1877 p. 180. 



Brackish water: Baltic (Schum.) 



4. A. Weissilogii Grun. (1877). — V. linear, with rounded ends. L. 0,i9 to 0,25; B. 0,012 

 to 0,013; Forks 0,06 to 0,08 mm. Strite 25 in 0,oi mm. — Grun. T. R.M. S. 1877 p. 180 PL CXCVf. 14. 



Fresh water: Oregon, fossil (Grun.). 



5. A. hungarica Pant. (1889). — V. narrow fusiform, obtuse. L. 0,o8 to 0,i; B. 0,oi4 mm. 

 Forks a third as long as the valve. Striae 11 in 0,oi mm. — BerTteleya hung. Pant. II p. 55 

 PL IX f. 165. 



Marine: Hungary, fossil (Pant.). 



A similar form, but with a longitudinal line (?) on each side of the median line is Berheleya 

 neogradensis Pant. Ill PL XXXVI f. 508 (1893). 



6. A. Debyi Lbud. Fortm. (1892). — V. gibbous in the middle and with very long and 

 narrow protracted ends, of unequal length. L. 0,22; B. 0,02 mm. Forks very elongated. Margin 

 of the valve with coarse »pearls» (loculi?). Strise not seen. — Lbud. Fortm. D. de la Malaisie 

 p. 22 PL II f. 10. 



Marine: Sumatra (Lend. Fortm.). 



I have had no opportunity of examing this very curious diatom, which to judge from the 

 figure seems .to have a loculiferous marginal rim as in Mastogloia, 



Naviculse Mesoleise Cl. 



Valve symmetrical, linear to elliptical, with usually obtuse or rostrate ends. Axial area 

 narrow or indistinct. Central area large, quadrate, or a transverse fascia. Strise usually fine, 

 punctate and radiate throughout. Connecting zone not complex. 



This Section comprises a number of usually small forms, inhabiting fresh, rarely salt water. 

 By N. Pupula and N. bacilliformis this section is closely connected with Naviculte iacillares. 

 There is alsa some relation between some species of this group and of the section Navicula; punctata. 



Artificial hey. 



I Valve constricted in the middle N. hinodis EhB. 



\ — not — — — 2. 



o I Length about 0,12 mm . ■ . N. Szaboi Pant. 



\ — — 0,04 mm. or less .... 3. 



Terminal nodnles with lateral expansions . . N. Pupula KtJTZ. 



-■ without — — . . . . 4. 



M' 



