66 p. T. CLEVE, SYNOPSIS OF THE NAVICl'LOH) DIATOMS. ■ 



Var. versicolor (tRun. (1(S74). — Lateral areas broader, nut cunstricted in the middle. Stria- 

 10 in 0,0 1 mm. punctate, puiiota 17 t« 20 in 0,01 mm. — i\^ versicolor Grun. A. S. N. S. D. II 

 f. 17. Atl. LXX f. 18 to 22. V. H. Syn. PI. X f. (i. N. roviynenMs Grun. in Cl. M. I). N:o 2W 

 (1879). N. seductilis car. Perag. Villefr. D. p. 49 PI. II f. 20. 



Marine: North Sea! Mediterranean Sea! Adriatic! Snmati'a! 



Var. vummitlaria Grev. (1859). — V. nearly orbicular. L. 0,o2.^ to 0,04.5; B. 0,017 to 0, 038 

 mm. Strite 10 in 0,oi mm. finely punctate, puncta about 18 in 0,oi mm. — iV. nunim. (tREV. 

 Edinb. N. Ph. J. X p. 29 PL IV f. (>. X. forci2). var. nnmmidaroides Grun. A. S. Atl. LXX f. 30, 

 31, 39, 40 (1881). 



Marine: Adriatic (Atl.), Bab el Mandeb! Madagascar! Cape of (xood Hope (Atl.), Java! 

 California guano ((irev.), Florida! 



Var. suhorhicularis Grun. (1880). — A.s var. nummularia, but with closer .striai, 13 to 14 

 in 0,01 mm. L. 0,oi8 to 0,o36; B. O,oi'i to 0,024 mm. — V. H. Syn. PI. X f. 5. 



Marine: Spitsbergen! North Sea! Balearic Islands! Seychelles! Zulu Sea (Deby Coll.)! (irala- 

 pagos Islands! 



Var. densestriafa A. S. (1881). — Eliptical. L. 0,0,3 to 0,og; B. 0,oi2 to 0,oi8 mm. Stria 

 15 to 22 in 0,oi mm. — Atl. LXX f. 12 to Ki. .V. fore. rar. minor A. S. Atl. LXX f. 32. A. S. 

 N. S. D. I f. 44. 



Marine: North Sea! Corsica! Cape of Good Hope! Java! Japan! Campeachy Bank (Atl.). 



This variety connects N. forripatu and -A^. ^^//^»/fea, so that the latter might be I'egarded as 

 a variety of N. forci2>ata. 



Var. balnraris Grun. (1880). — V. linear-elliptical. L. 0,037; B. 0,oi mm. Lateral areas 

 not constricted in the middle, and foi'ming by their junction a broad stauros. Stria; 18 in 0,oi 

 mm. — N. pjjgtii. rar. halnearis Grun. in V. H. Syn. X f. 8. 



Slightly brackish water: Sweden, Ronneby, fossil! 



Additional. 



N. seriosa Pant. (Ill PL XXXII f. 464). — Elliptical, rostrate-acuminate. L. 0,047; B. 0,033 

 mm. Lateral areas moderately broad, with scattered linear markings, very slightly constricted in 

 the middle and convergent at the ends. Strife 12 in 0,0 1 mm. distinctly punctate. 



Marine: Hungary, fossil (Pant.). 



Naviculse Lgevistriatse Cl. 



Valve in outline more or less lanceolate. Axial area linear, abrnjjtly dilated around the 

 central nodule to an orbicular space, or transverse fascia, or uniting with the central ai-ea in a 

 more or less broad, lanceolate space. Stri<e usually coarse, radiate, not distinctly punctate or 

 lineate, not crossed by longitudinal lines or furrows. Terminal fissures of the median line usually 

 small and indistinct. Connecting zone not complex. 



This section is remarkable for its apparently smooth stiise, and might on that account have 

 been placed in the genus Finniilaria. But most of the species bear a closer relationship to the 

 true Navicula; than to the Pinnulariai, and, besides, it is possible that the striee may be only 

 apparently smooth. Nav. palpehralis, which I place in the section, is usually described and figured 

 as having distinctly punctate striai, but I have never been able to detect any punctate character 

 in its stria;. It does however contain several forms (as for instance Nav. hifuminosa) which are 

 closely related to species of Pinnularia, belonging to the section divergcntes of that genus. On 

 the other hantl several species shew a close afiinity to those of the .section Entoleice of Navicula. 



