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



14. P. Br^bissoni Kutz (1844). — V. linear-elliptical, with rounded ends. L. 0,o4 toO.oe; 

 B. 0,0 11 to 0,01 mm. Area narrow, gradually widened in the middle to a transverse fasoiaj 

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

 convergent towards the, ends. — Nav. Brebissonii Kutz Bae. p. 93 PL 111 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). PBDicma,; Isohia 

 PL II f. 21. Nav. Mormonorum Gkun. in A. S. Atl. XLIV f. 24 to 26. Nav. Brebissonii var. fossilis 

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



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

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

 land! Italy! Greenland! Utah! 



Var. diminuta V. H. (1880). -^ Smaller, with gradually narrowed ends. — Syn. p. 77 PL V f. 8. 



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



Var. notata HiniB. a. Peras, (1893). — V. more narrow, slender. L. 0,05 to0,o55; B. 0,oo8 

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

 p. 87 PL IV f. 11. P. stauroneif. Sm. B. D. XIX f. 178 /J. A. S. AtL: XLIV f. 19. 



Fresh water: Iceland! Norway (Romsdalen)! Finland! Germany (Franzenbad, AtL), Puy de 

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



P. , Brebissonii is a very variable species, closely ebnnected with smaller forms of F. d'iver- 

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



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

 L. 0,0 4 5 to 0,05; 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. 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 (Mouth of Tana-elf)! Sweden (Lule Lappmark, 

 Wenern, Rosslangen in Smaland, Umea, fossil) !-FinL, Karelen! 



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

 rostrate, broad ends. L. 0,o7 to 0,oii; B. 0,oi5 to 0,oi8 mm. Median line filiform, with comma- 

 like terminal fissures. Axial area broad, nearly '/a 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. II: 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 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. florentina Grun. (1877). — L. 0,i to 0,13; B. 0,oi8 mm. Central area dilated to a 

 transverse fascia. Strise 8 in 0,oi mm. — Nav. {Esox var.?) florent. Gjiun.. in Cl. M. D. N:o 44. 

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

 PL IV f. 2 (1893). 



Fresh water: Livorno (AtL), S:ta Flora! 



Var. ornata Cl. — L. 0,07; B. 0,oiz mm. Central area a transverse fascik, with; a row of 

 puncta: on each side of the central nodtile. Strise 11 in 0,oi 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 F. Legurden: I have adopted 

 the apinion expressed' in Van: Hbubcks synopsis; - P. Legumen is most variable, the : dndulktions of 



