KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 26. N:0 2. 12,7 



Var. maxima H. L. Smith (1886). — L. 0,37; B. 0,04 mm. Forks 0, 01 mm. Stria; 32 in 

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



Fresh water: Oregon, fossil. 



Var. Truani V. H, — V. fusiform, acute. L. 0,20; B. 0,023 mm. Forks 0,oo6 mm. Terminal 

 nodules elongated. Transverse and longitudinal strise 26 in 0, 01 mm. — A. Lindheimeri var. Truani 

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

 Icon. n. Pl. VI f. 1. 



Fresh water : Spain ! 



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

 Forks 0,o.T mm. Terminal nodules elongated. Strite 26 in 0, 01 mm. — Kitton J. Quekett M. C. 

 (2) II p. 21 Pl. IV f. 4. 



Marina: Japan (Kitton). 



Var.' Schiimämiii Grun. (1877). — L. O, is to 0,02; B. 0,oi4 mm. StriiS 16 in 0,oi mm. — 

 A. peUucida Sghum. Preuss. D. II N. p. 53 Pl. I f. 9. A. Schimi. Grun. T. R. M. S. 1877 p. 180. 



Brackish water: Baltic (Schum.) 



4. A. Weissflogii Grun. (1877). — V. linear, with ronnded ends. L. 0, 19 to 0,25; B. 0,oi2 

 to 0,013; Forks 0,06 to 0,o8 ram. 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,u8 to 0,i; B. 0,oi4 mm. 

 Forks a third as long as the valve. Strite 11 in 0, 01 mm. — Berheleya hung. Pant. II p. 55 

 Pl. IX f. 165. 



Marine: Hungary, fossil (Pant.). ^^ , ^_ ,, 



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

 neogradensi^ Pant. III Pl. XXXVI f. 508 (1893). 



6. 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.=;e »pearls; (loculi?). Strife not seen. — Leud. Fortm. D. de la Malaisie 

 p. 22 Pl. 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. 



VJV',H»Vi ./^ .1: 



NaviJulse Mesoleise Cl. 



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

 narrow or indistinct. Central area large, quadratej or a transverse,- fasöia,. Stri» usually fine, 

 punctate and radiate throughout. Connecting ZQue 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 Naviculce hacillares.. 

 There is also some relation between some speeies of this group and of the section Navicula: punctatce. 



-- , : ;-/;«! , 

 Arfificial Jcey. ,.. ■ 



j Valve constricted in tlie middle ,7., ....;.,., .'. N.binodis EhB. 



,\ — not — — — ...ji ,.-!;-: . . ,.<^. ._■. . 2. _-'- 



i Length about 0,12 mm '.''.".■■ '." . 5V. ' giaSoi Pant. „ ___, 



' \ — — 0,04 mm. or less . .^^ 3. ' '--'- 



{ 



Terminal nodules with lateral expansions . . . ■.• ." ^. :- . .('!^'0-.- ... .. 'N. Piipula KtiTZ. 

 — - without — — . . -• i. ,.1't -JC-ö-.i? !.;j'-"! -.iVJ- • . •, ■ 4. 



