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



49. I). oUiptica Kutz. (1844). — V. elliptical, with broad and rounded ends. L. 0, 02 to 

 0,037; B. 0,011 to 0,02 mm. Central nodiile of medium size quadrate. Fnrrows narrow, ofthesame 

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

 forming irregular longitudinal rows. — Nav. elUptka KtJTZ. Bac. j). 98 Pl. XXX f. 55? V. H. 

 Syn. Pl. X f. 10 (upper figure). A.. S. Atl. VII f. 29, 32. Nav. ellijttica var. minor Gtrdn. Foss. 

 D. Österr. Ung. p. 145. Nav. ovalis W. Sm. B. D. I p. 48 Pl. XA^II f 153 0'? Nav. elliptica 

 W. Sm. b. D. Il p. 93. 



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

 (New York)! Ecuador! 



Var. grandis Grun. (1882). — L. 0,o6 5 to 0,13; B. 0, 033 to 0, 04 5 mm. Transverse and longi- 

 tudinal rows of alveoli 10 in 0, 01 mm. — Nav. ellipt. var. grandis Grun., Foss. D. Österr. Ung. 

 p. 145. Nav. prtedara Pant. III Pl. XI f. 182 (1893). 



Brackish water: Hungary, fossil! 



Var. ladogensis Cl. (1891). — L. 0,o6; B. 0,025 mm. Transverse costpe. 9 in 0,oi mm. irregu- 

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



Fresk water: Ladoga! 



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

 L. 0,045; B. 0,02 7 mm. Transverse rows of alveoli 6 in 0,oi mm. — Nav. osfrac. Pant. III 

 Pl. IX f. 145. 



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



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

 Central nodule large, quadrate. Furrows narrow, of the same breadtli tlirougkout. Costa? 12 to 

 18 in 0,01 mm. Alveoli indistinct. — Nav. Puella Schum. Pi^euss. D. II Nacktr. f. 39? Nav. 

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



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

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

 intermediate forms witk D. elliptica. Navicula Fuella A. S. is quite anotker form (see page 88). 



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

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

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



Fresk water: Finland! 



52. D. oculata Bréb. (1854). — V. elongate-elliptical. L. 0,oi5 to O.02; B. O.ooe to 0,oo7 

 mm. Central nodule small. Fui-rows very narrow. Costai 23 in 0, 01 mm. Alveoli very small. — 

 Nav. oculata Bréb. in Desm. Crypt. N:o 110. Journ. Quek. M. Cl. 1870 f. 5. V. H. S}ti. Pl. IX f. 10. 



Fresk water: France. 



53. D. ovalis Hilse (1861). — V. broadly elliptical, not constricted in tke middle. L. O.os.t 

 to 0,043; B. 0,02 to 0,02 6 mm. Central nodule very large, rounded. Furrows very narrow, closely 

 foUowing tke central nodule and its horns. Transverse rows of alveoli 13 to 19 in 0, 01 mm. 

 radiate at the ends. Puncta 13 to 20 in 0, 01 mm. forming irregular longitudinal rows. — Fiiuia- 

 laria ovalis Hilse in Pab. A. E. 1025. Nav. ovalis A. S. Atl. VII f. 33, 34, 35, 36. AV. Sm. B. 

 D. XVII f. 153 a? Cl. D. of Finland p. 44 Pl. II f. 13. Nav. ellip>tica A. S. Atl. VII f. 30. 

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



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

 (L)ovre)! Saxony! Alps of Switzerland! Australia, Daintree Biver! 



Var. puniila Grun. (1882). — L. 0,02 to 0,022; B. 0,oos to 0,o85 min. Eows of alveoli 16 

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

 Nnp. Parmula Bréb. (according to Grunow). 



Fresk water: Hungaiy, foss. (Grun^), Baku (Grun.). 



