92 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



49. D. elliptica Kutz. (1844). — V. elliptical, with broad and rounded ends. L. 0,o2 to 

 0,037; B. 0,011 to 0,02 mm. Central nodule of medium size quadrate. Furrows narrow, of the same 

 breadth throughout. Transverse rows of puncta 10 to 13 in 0,oi mm. Alveoli 10 to 14 in 0,oi mm. 

 forming irregular longitudinal rows. — Nav. elliptica KtJTZ. Bac. p. 98 PL XXX f. 55? V. H. 

 Syn. PI. X f. 10 (upper figure). A. S. Atl. VII f. 29, 32. Nav. elliptica var. minor Grxjn. Foss. 

 D. Osterr. Ung. p. 145. Nav. ovalis W. Sm. B. D. I p. 48 PI. XVIII f. 153 a'? Nav. elliptica 

 W. Sm. B. D. II p. 93. 



Fresh water: Iceland! Sweden! Finland! Germany! England! New Zealand! North America 

 (New York)! Ecuador! 



Var. grandis Grun. (1882). — L. 0,065 to 0,i3; B. 0,033 to 0,o45 mm. Transverse and longi- 

 tudinal rows of alveoli 10 in 0,oi mm. — Nav. ellipt. var. grandis Grun., Foss. D. Osterr. Ung. 

 p. 145. Nav. prceclara Pant. Ill PL XI f. 182 (1893). 



Brackish water: Hungary, fossil! 



Ya,T.^ladogensis Cl. (1891). — L. 0,o6; B. 0,o25 mm. Transverse costse 9 in0,oi mm. irregu- 

 larly anastomosing with a few longitudinal undulating costse. — Cl. D. of Finland p. 43 PL II f. 9. 



Fresh water: Ladoga! 



Var. Ostracodarum Pant. (1893). — ■ V. elliptical, tapering from the middle to the ends. 

 L. 0,045; B. 0,027 mm. Transverse rows of alveoli 6 in 0,oi mm. — Nav. ostrac. Pant. Ill 

 PL IX f. 145. 



Habitat:? KSpecz, Hungary, fossil (Pant.). 



50. D. Puella (Schum. 1867?) Cl. — V. elliptical. L. 0,oi3 to 0,025; B. 0,oo8 toO,oi4 mm. 

 Central nodule large, quadrate. Furrows narrow, of the same breadth throughout. Costse 12 to 

 18 in 0,01 mm. Alveoli indistinct. — Nav. Puella Schum. Preuss. D. II Nachtr. f. 39? Nav. 

 elliptica var. minutissima V. H. Syn. p. 92 PL X f. 11. 



Fresh water: Spitzbergen! Sweden! Finland! Berlin! Hungary, fossil (Grun.). 

 This species, differing only in its small size and indistinct alveoli, is closely connected by 

 intermediate forms with D. elliptica. Navicula Puella A. S. is quite another form (see page 88). 



51. D. Boldtiaua Cl. (1891). — V. elongate-elliptical. L. 0,03; B. 0,0012 mm. Central 

 nodule small, quadrate. Furrows of equal breadth throughout. Costse 14 in 0,oi mm. No distinct 

 alveoH. — Cl. D. of Finl. p. 43 PL n f. 12. 



Fresh water: Finland! 



52. D. oculata Br^b. (1854). — V. elongate-elliptical. L. 0,015 to 0,02; B. 0,oo6 to 0,oo7 

 mm. Central nodule small. Furrows very narrow. Costse 23 in 0,oi mm. Alveoli very small. — 

 Nav. oculata Br^b. in Desm. Crypt. N:o 110. Journ. Quek. M. Cl. 1870 f. 5. V. H. Syn. PL IX f. 10. 



Fresh water: France. 



53. D. ovalis Hilsb (1861). — V. broadly elliptical, not constricted in the middle. L. 0,035 

 to 0,043; B. 0,02 to 0,026 mm. Central nodule very large, rounded. Furrows very narrow, closely 

 following the central nodule and its horns. Transverse rows of alveoli 13 to 19 in 0,oi mm. 

 radiate at the ends. Puncta 13 to 20 in 0,oi mm. forming irregular longitudinal rows. — Finnu- 

 laria ovalis Hilsb in Rab. A. E. 1025. Nav. ovalis A. S. Atl. VII f. 33, 34, 35, 36. W. Sm. B. 

 D. XVII f. 153 a? Cl. D. of Finland p. 44 PL II f. 13. Nav. elliptica A. S. Atl. VII f. 30. 

 V. H. Syn. PL X f. 10 (lower fig.). Nav. Carpathorum Pant. Ill PL XVII f. 246 (1893)? 



Fresh water: Sweden (Lapland, Gotland, Billingen)! Finland (Russian Lapland)! Norway 

 (Dovre)! Saxony! Alps of Switzerland! Australia, Daintree River! 



Var. pumila Grun. (1882). — L. 0,02 to 0,022; B. 0,oo8 to 0,o85 mm. Rows of alveoli 16 

 to 18 in 0,01 mm. — Nav. ovalis var. pum. Grun. Foss. D. Osterr. Ung. p. 150 PL XXX f. 61. 

 Nav. Parmula BuikB. (according to Grunow). 



Fresh water: Hungary, foss. (Gruuj), Baku (Grun.). 



