52 P. T. CLEVE, SYNOPSIS OF THE NAVICULUll; JJIATOMS. 



Var. curta G-run. (1880). — V. linear-elliptical, with cuneate ends. L. 0,o:i; B. O,oi-j mm. 

 Nav. lim. v. curta Grun. in V. H. Syn. Pl. XII f. 28. 



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

 truncate ends. L. 0,o6; B. 0,oo75 mm. — Lägst. p. 81. Pl. I tig. 7 a. 



Fresh water: Spitsbergen (Lägst.). 



In Verb. 1860 Grdnow describes two more varieties, named truncutu and hicuneata, whicb 

 however seem to be forms of Neidium. 



B. Forms ivitli transverse fascia. 



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

 ends. L. 0,022 to 0,03.3; B. 0,oo6 mm. Axial area indistinct. Striae 21 to 22 in 0, 01 mm. — 

 Nav. ventricosa var. minufa? Grun. in V. H. Syn. Pl. XII f. 26. 



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



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

 rounded ends. L. 0, 04 to 0,o6; B. 0, 009 to 0,oii mm. Axial ai'ea narrow. Strite 18 to 20 in O.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. Haslins.shji Pant. II p. 47 Pl. XI f. 193 (1889). — Nav. ventricosa var. subnndidata 

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



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



Var. truncatula Grun. (1880). — V. elliptical, with rounded ends, not gibbous. L. O.04; 

 B. 0,01 mm. Axial area narrow. — Nav. ventric. v. Iruncat. Grun. V. H. Sj^n. Pl. XII f. 25. 



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

 ends. L. 0,063; B. 0,ou5 mm. Axial area narrow. Strife 16 to 17 in 0, 01 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 transverselj'. Axial area very nari'ow. 

 StricK. 22 to 23 in 0,01 mm., convergent at the ends. — Nav. subventricosa Grun. A. D. p. -2^ 

 Pl. I f. 19. 



Brackish water: Sea of Kära (Grun.). 



9. C. tahitonsis 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. Stria' 12 to 13 in 0,oi mm., 

 slightly radiate, finely punctate. Longitudinal lines median. — Nav. TaJi. 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 onlj'- a variety of N. Silicula. 



10. C. patagonicii Cl. (1881). — V. convex, linear with cuneate ends. L. O.os: to O.oa; 

 B. 0,009 to 0,0 13 mm. Axial area narrow, but distinct. Central area a broad fascia, reaching to 

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

 the margin by a faint longitudinal line. — Nav. viriäis var. påtar/. Cl. Färskv. D. frän Grönl. och 

 Arg. p. 12 Pl. XVI f. 3. 



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

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

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



