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 

 0,0:37; B. 0,011 to 0,02 mm. Central nodule of medium size quadrate. Furrows narrow, of the same 

 lireadth 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 PI. XXX f. 55? V. H. 

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

 D. Osterr. Ung. p. 145. Nav. oralis 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! (rermany! England! New Zealand! North America 

 (New York)! Ecuador! 



Var. fjrandis Grun. (1882). — L. 0,065 to 0,13; B. 0,03.3 to 0,o45 mm. Transverse and longi- 

 tudinal rows of alveoli 10 in 0,oi mm. — Nav. ellipt. var. (jrandis (tRUN., Foss. D. Osterr. Ung. 

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



Brackish water: Hungary, fossil! 



Var. ladoyensis Cl. (1891). — L. 0,06; B. 0,025 mm. Transverse costfe 9 in 0,o 1 mm. irregu- 

 larly anastomosing with a few longitudinal undulating costpe. • — Cl. D. of Finland p. 43 PI. II f. 9. 



Fresh water: Ladoga! 



Var. Ostracodaruni 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 

 PI. IX f. 145. 



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



50. D. Puella (Schum. 1867?) Cl. — V. elliptical. L. 0,oi3 to 0,025; B. 0,oo8 to0,oi4 mm. 

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

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

 elliptica var. minntissima V. H. Syn. p. 92 PI. X f. 11. 



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

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

 intermediate forms with I), elliptica. Navicula Fiiella 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. CosttE 14 in 0,oi mm. No distinct 

 alveoli. — Cl. D. of Finl. p. 43 PL II f. 12. 



Fresh water: Finland! 



52. D. oculata Br^b. (1854). — V. elongate-elliptical. L. 0,oi5 to 0,02; B. 0,oo6 to 0,oo- 

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

 Nav. oculata Breb. in Desm. Crypt. N:o 110. Journ. Quek. M. Cl. 1870 f. 5. V. H. Syn. PI. IX f. 10. 



Fresh water: France. 



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

 to 0,043; B. 0,02 to 0,0 2 6 mm. Central nodule veiy large, rounded. Fxirrows 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 0,01 mm. forming irregular longitudinal rows. — Finnu- 

 laria ovalis Hilse 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 PI. II f. 13. Nav. elliptica A. S. Atl. VII f. 30. 

 V. H. Syn. PL X f. 10 (lower fig.). Nav. CarpatJwrum 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 ram. — Nav. ovalis var. pum. Grun. Foss. D. Osterr. Ung. p. 150 PL XXX f. 61. 

 Nav. Parniula Br^b. (according to Grunow). 



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



