118 1'. T. CLEVE, SYNOl'SLS OK THE NAVICULOII) DIATOMS. 



17. (t. Orovei Cl. (DSiU). — V. linear, sigmoid at tho attenuated, obli([ueiy nnuided, ends. 

 L. 0,4 to 0,6; B. 0,03 to 0,06 mm. Central nodule oblicpiely elliptical. Median line central, scarcely 

 flexuose. T.S. : L.S. 7,3 in 0,oi mm. — Fleur. Grovcii Pkr. p. 22 PI. VllI f. 1. 



Brackish water: Java! Singapore! 



18. G. spectabile Grun. (1891). — V. sigmoid, linear, obtuse. L. 0,3 to 0,34; B. 0,u4 mm. 

 Median line central, sigmoid, enclosed between two siliceous strings. Central nodule small, elongated. 

 Terminal areas large. T.S. : L.S. 'V23 ^^ ^'i^" ^'^^- — fh-iir. sjxct. Per. p. 21 PI. VII f. 14. 



Brackish water: Brazil! 



This isolated species is very interesting, as the central nodule and the median line recall 

 those of Frustulia and Navicular Orthosticlue. 



19. (j. sc.alproides Rabh. (1861). — V. slightly sigmoid, linear, with obliquely rounded 

 ends. L. 0,05 8 to 0,o68; B. 0,oi mm. Median line straight. Central nodule elongated. Median 

 transv. strite somewhat radiate. T.S. : L.S. --/og in 0,oi mm. — Flcur. scalproidcs Rabh. Alg. Eur. 

 N:o 1101. Grun. A. D. p. 60. V. H. Syn. 'p. 119 PI. XXI f. 1. P. Spencerii var. scalpr. 

 Per. VIII f. 31. 



Fresh water: Germany! U. States, Kansas River! ('ameroon, Africa! 



Var. {Endosigma) eximia Th\v. (1856). — V. linear, obli({uely truncate. L. 0,o6 to 0,o8; 

 B. 0,009 to 0,01 mm. Median line straight, somewhat excentric in the ends. T.S. : L.S. -727) '"/'og 

 in 0,01 mm. Frustules enclosed in gelatinous tubes. - CoJIctoHcuia cxim. Thw. in W. Sm. B. D. 

 II p. 69 PI. LVI f. 350. Fleur. cxim. V. H. Syn. p. 119 PL XXI f. 2. Per. VIII f. 47. 



Fresh water: Sweden (Gulf of Bothnia, Upsala)! England (W. Sm.), Belgium (V. H.), Bengal! 



Var. ohliqna Grun. (1880). — V. linear, obliquely truncate. L. 0,o69; B. 0,o i4.-) mm. Central 

 area elongated, oblique. Median line straight, curved at the ends, central. T.S. : L.S. -'-/.,, in 

 0,01 mm. — Plcur. ohl. Grun. A. I), p. 56. Per. VII f. 34. 



Brackish water: Sierra Leone (Grun.), LT. States! Savannali, Ga.! 



20. CJ. Temperei Cl. (1893). — V. linear, with obliqely truncate and rounded ends. L. 0,i4; 

 B. 0,014 mm. Median line central, straight, curved only at the ends. Central nodule small, 

 elongated. T.S. : L.S. '''j^^. — Diatomiste II p. 55 PI. Ill f. 3. 



Brackish water: Connecticut! 



This form has nearly the same outline as F. halficxiit, Init is smallei' and has closer striation. 



21. G. plagio-stomum Grun. (1880). — Y. linear, with obliquely rounded ends. L. 0,i; 

 B. 0,0 13 mm. Median line central, slightly Hexuose. Central nodule large, elongated and oblique. 

 Transv. and longit. stride equidistant, 18 to 19 in 0,oi mm. — Fleur. play. Grun. A. D. p. 56. 

 Per. VII f. 33. 



Marine: Seychelles (Grun.), Sierra Leone! Barbados! 



Fleur. sciofeme Sulliv. (1854 Sillim. J. XXVII p. 251; Grun. A. D. p. 59), which seems to 

 be the same as Fl. Wansbeckii Per. VII f. 25, 26, is probably only a variety of (r. plagiostomum. 

 Specimens from Hudson River (Icon. nost. Part II PI. I f. 5) differ from that form in their some- 

 what larger size (L. 0, u to 0,i6; B. 0,oi6 to 0,oi8 mm. T.S. : L.S. i^',g, '%,, in 0,01 mm.). 



22. G. balticuin Ehb. (1830). — V. linear, with obliquely truncate and obtuse ends. 

 L. 0,2 to 0,4; B. 0,024 to 0,040 mm. IMedian line slightly excentric and somewhat flexuose. Cen- 

 tral area small, o})li(iue. Transv. and longit. stria?, equidistant, 11 to 16 in 0,oi mm. — Nav. 

 haltica Ehb. Abh. 1830 p. 114 (accord, to Chase). Flenr. hajfintm W. Sm. B. D. I 66 p. XXII 

 f. 207. Jan. Rabh. Hcmdnras D. PI. Ill f. 3. V. H. Syn. ]>. 117 PI. XX f. 1. I'er. VII f. 19, 20. 

 P. Mal-ron Johnst. M. .1. VIII p. 15. 



Brackish and marine: Baltic! North Sea! Caspian Sea (Grun.). Mediterranean Sea! Adriatic! 

 Red Sea! Java! Sumatra! Sandwich Islands! Samoa! Magellans Strait! Brazil! West Indies! At- 

 lantic coasts of U. States! 



