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



Var. curta G-run. (1880). — V. linear-elliptical, with cuneate ends. L. 0,03; B. 0,012 m.m. 

 Nav. Urn. v. curta Geun. in V. H. Syn. PI. XII f. 23. 



Var. capitata Lagst. (1873). — V. strongly inflated in the middle and with broad, sub- 

 truncate ends. L. 0,o6; B. 0,oo75 mm. — Lagst. p. 31. PL I iig. 7 a. 



Fresh water: Spitsbergen (Lagst.). 



In Yerh. 1860 Grunow describes two more varieties, named truncata and bicuneata, which 

 however seem to be forms of Neidium. 



B. Forms with transverse fascia. 



Var. minuta Grun. (1880). — V. strongly gibbous in the middle, with clavate or cuneate 

 ends. L. 0,022 to 0,033; B. 0,oo6 mm. Axial area indistinct. Strise 21 to 22 in 0,oi mm. — 

 Nav. ventricosa var. minuta? G-run. in V. H. Syn. PL XII f. 26. 



Fresh water: Spitsbergen! Finland, Kuopio! Belgium (V. H.). 



Var. ventricosa [Ehb. 1830?] Donk. (1873). — Linear gibbous in the middle and at the 

 rounded ends. L. 0,04 to 0,06; B. 0,oo9 to 0,oii mm. Axial area narrow. Striae 18 to 20 in 0,oi 

 mm. parallel or slightly radiate. — Nav. ventricosa Ehb. Abh. 1830 p. 67? Donk. B. D. p. 74 

 PL XII f. 7. V. H. Syn. p. 103 PL XII f. 24. Nav. Horvathii Grun. Verh. 1860 PL VI f. 18. 

 Var. Haslinssliyi Pant. II p. 47 PL XI f. 193 (1889). — Nav. ventricosa var. subundulata 

 Grun. A. D. p." 29 PL I f. 16. Nav. neogena Pant. Ill PL XVII £ 252; PL XXV f. 372 (1893)? 



Fresh or brackish water: Sweden! Finland! Sea of Kara (Grun.), England (Donk.) Japan! 



Var. truncatula Grun. (1880). — V. elliptical, with rounded ends, not gibbous. L. 0,o4; 

 B. 0,01 mm. Axial area narrow. — Nav. ventric. v. truncat. Grun. V. H. Syn. PL XII f. 25. 



Var. Kjellmaniana Grun. (1880). — V. gibbous in the middle with more narrow and rounded 

 ends. L. 0,o63; B. 0,oii5 mm. Axial area narrow. Strise 16 to 17 in 0,oi mm., slightly radiate. 

 — Nav. vent. v. Kjellm. Grun. A. D. p. 29 PL I f. 17. 



Marine: Finmark! 



V. Jenisseyensis Grun. (1880). — V. slightly gibbous in the middle. Ends rounded. L. 0,0445; 

 B. 0,01 mm. Strise 19 in 0,oi mm., parallel, slightly divergent at the ends. — Nav. ventric. v. 

 Jeniss. Grun. A. D. p. 29 PL I f. 18. 



Fresh water: Jenissey (Grun.). 



Var.? subventricosa Grun. (1880). — V. gibbous in the middle, with broad, rounded ends. 

 L. 0,066; B. 0,0095 mm. Central nodule slightly dilated transversely. Axial area very narrow. 

 Strise 22 to 23 in 0,oi mm., convergent at the ends. — Nav. subventricosa Grun. A. D. p. 29 

 PL I f. 19. 



Brackish water: Sea of Kara (Grun.). 



9. C. tahitensis Grun. (1863). — V. lanceolate, inflated in the middle, with obtuse ends. 

 L. 0,054 to 0,065; B. 0,002 mm. Axial and central areas indistinct. Strise 12 to 13 in 0,oi mm., 

 slightly radiate, finely punctate. Longitudinal lines median. — Nav. Tah. Grun. Verh. 1863 p. 152 

 PL V. f. 15. Nov. p. 19. 



Fresh water: Tahiti (Grun.). 



This species is unknown to me, perhaps it is only a variety of N. Silicula. 



10. C. patagonica Cl. (1881). — V. convex, linear with cuneate ends. L. 0,o5 7 to O.o9- 

 B. 0,009 to 0,013 mm. Axial area narrow, but distinct. Central area a broad fascia, reaching to 

 the margins. Strise 13 to 14 in 0,oi mm., almost parallel, but radiate at the ends, crossed near 

 the margin by a faint longitudinal line. — Nav. viridis var. patag. Cl. Farskv. D. fran Gronl och 

 Arg. p. 12 PL XVI f. 3. 



Fresh water, on moist rocks: Sierra Famatina, Rep. Arg.! Pichincha, Ecuador! 

 This remarkable freshwater-species may easily be mistaken for a Pinnularia, but the termi- 

 nal strise are radiate, not convergent as in the last named genus, 



