78 p. T. CLEVE, SYNOPSIS OF THE NAVICULOII) DIATOMS. 



li. P. Brebissoiii Kutz (1844). — V. linear-elliptical, with rounded ends. L. 0,o4 to 0,06; 

 B. 0,(111 to 0,0 1 mm. Area narrow,, gradually widened in the middle to a transverse fascia, 

 broader towards the central nodule. Strite 10 to lo in 0,oi mm., divergent in the middle and 

 convergent towards the ends. — Nav. Brehisaonii Kutz Bac. p. 93 PI. Ill f. 41). A. S. Atl. 

 XLIV f. 17, 18. V. H. Syn. p. 77 PI. V f. 7. Ldt Spitsb. D. PI. 1 f. 2 a'. Wolle D. of Am. X 

 f. 26? Finn, stauroneiformis W. Sm. Br. D. I p. 57 PI. XIX f. 178 a' (1853). Pedicino, Ischia 

 PI. II f. 21. Nav. Mormonorum Grun. in A. S. Atl. XLIV f. 24 to i^. Nav. Brehissonii var. fostiili.>> 

 Pant. Ill PI. XIX f. 279 (1893). 



Fresh water, (earth and mosses): Beeren Eiland (Ldt), Spitsbergen! Iceland! Norway (Dovre)! 

 Sweden! Scotland! England (W. Sm.), Finland! Belgium (V. H.), Germany (Harz, Atl.), Switzer- 

 land! Italy! Greenland! Utah! 



Var. diminuta V. H. (1880). — Smaller, with gradually narrowed ends. — Syn. \). 77 PI. V f. 8. 



Fresh water: Finland! Scotland! Belgium (V. H.). 



Var. notata HSrib. a. Perag. (1893). — V. more narrow, slender. L. 0,o.') to 0, 055; B. 0,oo8 

 to 0,009 mm. Strite 10 to 15 in 0,oi mm. strongly radiate. — Nav. notata H^rib. D. d'Auvergne 

 p. 87 PL IV f. 11. P. stauroncif. Sm. B. D. XIX f. 178 (i. A. S. Atl. XLIV f. 19. 



Fresh water: Iceland! Norway (Romsdalen)! Finland! Germany (Franzenbad, Atl.), Puy dc 

 Dome (foss. Herib.), Santa Rosa, Cal. ! 



P. Brehissonii is a very variable species, closely connected with smaller forms of P. dicer- 

 gens and with P. microstauron. Nearly allied also is P. uppendiculata. 



15. P. karelica Cl. (1891). — V. linear, gibbous in the middle, with broad, truncate ends. 

 L. 0,045 to 0,o.t; B. 0,011 to 0,012 mm. Median line straight, with moderately approximate median 

 pores and hook-shaped terminal fissures, turned in the same direction. Axial area indistinct; 

 central area large, orbicular. Striaj divergent in the middle, convergent at the ends 15 to 16 in 

 0,01 mm. — Diat. of Finl. p. 28 PI. I f. 6. 



Fresh or slightly brackish water: Norway (Mouth of Tana-elf)! Sweden (Lule Lappmark, 

 Wenern, Rosslangen in Smaland, Umea, fossil)! Finl., Karelen! 



16. P. Leglimeil Ehb. (1843). — V. linear-lanceolate, with triundulate margins and sul)- 

 rostrate, broad ends. L. 0,o7 to 0,oii; B. 0,01.5 to 0,oi8 mm. Median line filiform, with comma- 

 like terminal fissures. xVxial area broad, nearly '/j of the breadth of the valve, dilated in the 

 middle. Striae 10 to 12 in 0,oi mm., strongly divergent in the middle, convergent at the ends. — 

 Am. 1. 1. f. 7? Nar. Leg. Ehb. M. G. II: 2 f. 12. A. S. Atl. XLIV f. 44 to 47. V. H. Syn. p. 80 

 PI. VI f. 16. Nav. undulata Schum. P. D. p. 188 f. 37. 



Fresh water: Sweden! Norway (Stavanger, foss.)! Scotland! Belgium (V. H.), France! Italy 

 (S:ta Flora, foss.)! Bengal! New Zealand! Australia (Murray River, Australian Alps)! Japan! 

 Congo (V. H. Coll.)! North America (Port Hope, Crane Pond, French Pond, Waltham Mass., 

 Illinois)! 



Var. florcntina Grun. (1877). — L. 0, 1 to 0,13; B. 0,oi8 mm. Central area dilated to a 

 transverse fascia. Strise 8 in 0,oi mm. — Nav. {Esox var.'t') florcut. Grun. in Cl. M. I). N:o 44. 

 A. S. Atl. XLIV f. 8. Nav. dirergens var. undulata Hi5rib. a. Perag. U. d'Auvergne p. 89 

 PL IV f. 2 (1893). 



Fresh water: Livorno (Atl.), S:ta Flora! 



Var. ornata Cl. — L. 0,o-; B. 0,012 mm. Central area a transverse fascia with a row of 

 puncta on each side of the central nodule. Striic 11 in 0,01 mm. 



Fresh water: Bengal! 



Finn, or Nav. Legumen Ehb. seems to comprise several different species with triundulate 

 margins, so that it is impossible to say what species may be the true P. Lcgumcti. I have adopted 

 the opinion expressed in Van Heurcks synopsis. P. Legumen is most variable, the undulations of 



