148 P. T. CLEVE, SYNOPSIS OF THE NAVICULOII) DIATOMS. 



Var. ohtn.ia GriiUN. Ms. — V. linear, with broad, rostrate ends. L. 0,024; B. 0,006 mm. 

 Striffi 21 in 0, 01 mm. closer towards tlie ends (24 in 0,oi mm.). 



Fresh water: Sandwich Islands, Mauna Kea (Cl. M. D. N:o 141). 



Var.? nohilis Schum. (1867?). — V. lanceolate, rostrate. L. 0,ii; B. 0,023 mm. Stauros 

 narrowed towards the margins. StriiB 16 in 0, 01 mm., .slightlj^ radiate, eomposed of coarse, elongate 

 puncta, 15 in 0, 01 mm., arranged in oblique, somewhat undiilating rows. — S. nohilis ScuuM. P. 

 D. II Nachtr. p. 59 Pl. II f. 60? 



Slightly brackisli water: Kläckeberga, Kalmar län, Sweden, fossil (Ancylus-epoch)l 



I am not convinced that this form is really the same as Schiimann's, the puncta of whicli 

 are iignred as arranged in obliquely decussating rows as in Pleurosigma Else the outline and the 

 size agree pretty well with ScHUMAN]Sf's figure. 



B. Forms ivith capitate ends. 



Var. eloiigata Cl. — V. narrow linear-lanceolate. L. 0,055; B. 0, 000 mm. Striae 26 in 

 0,01 mm. — S. linearis var. in Cl. M. D. N:o 56. 



Fresh water: Germany! 



Var. aniphicephala Kutz. (1844). — V. lanceolate. L. 0,o4 to 0,o8; B. 0,oo9 to 0,oi5 mm. 

 Strite 21 to 22 in 0,oi mm. distinctly punctate. — S. anvph. KtiTz. Bac. p. 105 Pl. XXX f. 25. 

 S. anccps W. Sm. B. D. I Pl. XIX f. 190. V. H. Syn. p. 69 Pl. IV f. 4, 5. S. linearis Grux. 

 Verh. 1860 Pl. VI f. 11. 



Fresh water: Spitsbergen! Sweden (Westerbotten to Småland)! Belgium (V. H.), England 

 (W. Sm.), Switzerland (Brun), Japan! Bengal! Greenland! Maine! California! Brazil! Ecuador! 



Var, recta Cl. — V. linear. L. 0,045; B. 0,oo9 mm. StritB 23 in 0, 01 mm. 



Fresh water: Kuopio, Finland! 



Var. fossilis Cl. (1891). — V. lanceolate, with flattened, capitate ends. L. 0,o9; B. O.oie 

 mm. Striai 23 in 0,oi mm. — Cl. D. of Finland p. 40 Pl. II f. 18. 



Fresh water: Sweden (Degernäs in Westerbotten, fossil; Lake Rosslängen)! Finland (Savi- 

 taipale, foss.)! 



Var. argentina Cl. (1881). — V. lanceolate. L. 0,06 5; B. 0,oi3 mm, Stauros not reaching 

 to the margins. Strife 16 in 0, 01 mm. — S. qracilis var. arg. Cl. D, frän Grönl. och Argentina 

 p. 12 Pl. XVI f. 4. 



Fresh water: Sierra de Velasco, Argentina! 



16. S, Phyllodes Ehb. (1843). — V. lanceolate, with protracted, obtuse ends. L. 0,105; 

 B. 0,02 5 mm. Stauros narrower towards the margins. Strife 15 (iniddle) to 18 (ends) in 0,oi mm. 

 radiate throughout, punctate; puncta about 15 in 0,ni mm., arranged into irregularly nndulating 

 rows. — Ehb. Am. Pl. II: 1, f 16 etc? Icon. n. Pl. III f. 27. S. Sicbolclii Ehb. M. G. Pl. 

 XXXIV: 8, f. 12? 



Fresh water: Demerara River! 



17. S. (lllatiitii Ehb. (1843). — V. with parallel margins and rostrate, truncate ends. L. 

 0,065 to 0,068; B. 0,018 to 0,02 mm. Stauros broad, linear, reaching near to the margin. Striye 

 18 in 0,01 mm., radiate throughout, distinctly punctate, puncta 24inO,oi mm., forming nndulating, 

 longitudinal rows. — Ehb. Am. I: 2 f. 12. Cl. A. 1). p. 48 Pl. III f {V2. 



Fresh water (larger lakes): Sweden, Mälaren! Finland, Ladoga! Siberia, Mouth of Jenissey! 



18. S. Phoenicenteroii Ehb. (1843). — V. lanceolate, usually with slightly protracted, 

 obtuse ends. L. 0, 07 to 0,2; B. 0,028 to 0,o4 mm. Stauros linear. Strire radiate throughout 

 13 to 21 in 0,0 1 mm. distinctly punctate, puncta forming nndulating, longitudinal lines, — 

 Ehb. Am. Pl. II: 5 f. 1 etc. 



