78 



14. P. Brébissoiii Kutz (1844). — V. linear-elliptical, with rounded ends. L. 0,o4 toO,o6; 

 B. 0,0 1 1 to 0,0 1 mm. Area narrow, gradually widened in the middle to a transver.se fascia, 

 broader towards the central nodule. Striaj 10 to 13 in 0,oi mm., divergent in the middle and 

 convergent towards the ends. — Nuv. Brébissonii Kutz Bac. p. 93 Pl. Ill f. 49. A. S. Atl; 

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

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

 Pl. II f. 21. Nav. Mormonoruni Grun. in A. S. Atl. XLIV f. 24 to 26. Nav. Brébissonii var. fossilis 

 Pant. III Pl. XIX f. 279 (1893). 



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

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

 land! Italy! Greenland! Utah! 



Var. diminuta V. H. (1880). — Smaller, with gradvially narrowed ends. — Syn. p. 77 Pl. V f. 8. 



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



Var. notata Hérib. a. Perag. (1893). — V. more narrow, slender. L. 0,o.'5 to O, oss; B. 0,oo8 

 to 0,009 ram. Strise 10 to 15 in 0,oi mm. strongly radiate. — Nav. notata Hérib. D. d'Auvergne 

 p. 87 Pl. IV f. 11. F. stauroneif. Sm. B. D. XIX f. 178 /I A. S. Atl. XLIV f. 19. 



Fresh water: Iceland! Norway (Romsdalen)! Finland! Germany (Fraiizenbad, Atl.), Puy de 

 Döme (foss. Hérib.), Santa Rosa, Cal. ! 



F. Brébissonii is a very variable species, closely connected with smaller forms of F. diver- 

 gens and with F. microstauron. Nearly allied also is F. appeyidiculata. 



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

 L. 0,045 to 0,os; B. 0,oii to 0,oi2 mm. Median line straight, with moderately approximate median 

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

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

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



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

 Wenern, Rosslängen in Småland, Umeå, fossil)! Finl., Karelen! 



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

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

 like terminal fissures. Axial area broad, nearly ','3 of the breadth of the valve, dilated in the 

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

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

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

 transverse fascia. Strife 8 in (),oi mm. — Nav. {Esox var.'^) florcnt. Grun. in Cl. M. D. N:o 44. 

 A. S. Atl. XLIV f. 8. Nav. divergens var. undulata Hérib. a. Perag. D. d'Auvergne p. 89 

 Pl. IV f. 2 (1893). 



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



Var. ornata Cl.' — L. 0,07; B. 0,012 mm. Central area a transverse fascia with a row of 

 puncta on each sidc of the, central nodule. Striic 11 in 0,oi mm. 



Fresh water: Bengal! 



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

 margins, sf) that it is impossible to say what species may be the true F. Legumen. 1 have adopted 

 the oi)iiiion expressed in Van Heurcks synopsis. F. Legumen is most variable, the undulations of 



