KONCL. SV. VET. AKADEMIKNS IIANDLINiiAU. I5AN1) 26. N:() 2. 127 



Var. maxima H. L. Smith (188()). — L. 0,3?; B. 0,04 nun. Forks 0,01 mm. Htriii- 152 in 

 0,0 1 mm. — A. maxima Walker and Chase N. R. D. p. 2 PI. II f. ;'). 



Fresh water: Oregon, fossil. 



Var. Truani V. H. — V. fusiform, acute. L. 0,2o; B. 0,02."$ mm. Forks 0,006 mm. Terminal 

 nodules elongated. Transverse and longitudinal striae 2() in 0,oi mm. — A. Linilhcimeri var. Truani 

 V. H. T. N:o 16(). Truan D. Astur. PI. II f. 84, 35 (according to I)e Toni). A. pell. car. Tr. 

 Icon. n. PI. VI f. 1. 



Fresh water: Spain! 



Var. recta Kitton (1884). — V. linear, with gently cuneate ends. L. 0,226; B. 0,oi9 mm. 

 Forks 0,05 mm. Terminal nodules elongated. Strite 2() in 0,(ii mm. - Kitton J. Quekett M. C. 

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



Marine: Japan (Kitton). 



Var. Schumannii Gtrun. (1877). — L. 0, is to 0,02; B. 0,oi4 mm. StricB 16 in 0,oi mm. — 

 A. pellucida Schum. Preuss. D. II N. p. 53 PI. I f. 9. A. Schum. Grun. T. R. M. S. 1877 p. 180. 



Brackish water: Baltic (Schum.) 



4. A. Weissflogii Grun. (1877). — V. linear, with rounded ends. L. 0,i9 to 0,25; B. 0,oi2 

 to 0,0 13; Forks 0,06 to 0,o8 mm. Strife 25 in 0,oi mm. — Grun. T. R. M. S. 1877 p. 180 PI. CXCV f. 14. 



Fresh water: Oregon, fossil (Grun.). 



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

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

 PI. IX f. 165. 



Marine: Hungary, fossil (Pant.). 



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

 neogrademi.s Pant. Ill PI. XXXVI f. 508 (1893). 



(). A. Debyi Leud. 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 coar.se »pearls' (loculi?). Strise not seen. — Leud. Fortm. D. de la Malaisie 

 p. 22 PI. II f. 10. 



Marine: Sumatra (Leud. 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, ([uadrate, or a transverse fascia. Stria' 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 A'. Fupula and N. hncilliformis this section is closely connected with Naviculce hacillares. 

 There is also some relation between some species of this group and of the section Naviculce punctatts. 



Artificial key. 



j Valve (.onstricted in the middle N. binodis Ehb. 



1 — not — — - 2. 



j Leiigtli about 0,i2 mm X. Szaboi Pant. 



1 — — 0,04 mm. or les.s 3. 



„ . Terminal nodules with lateral expansions N. Pupula Kdtz. 



- without — — i ij.i 4. 



( Termi 



