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



Var. Fulgur Bkun (1891). — Almost orbicular. L. 0,o3 to 0,04; B. 0,o27 to 0,036 mm. 

 Upper V. with narrow axial area, and large irregular central area. Strise 12 in 0,oi mm. radiate, 

 punctate; puncta 11 in 0,oi mm. Lower V. with sigmoid median line and transverse, outwardly- 

 dilated, central area. Strise 14 in 0,oi mm., radiate, coarsely punctate; puncta 13 in 0,oi mm. 

 becoming larger towards the margin. — C Fulgur Brun D. espfeces nov. p. 17 PI. XVIII f. 3. 



Marine: Mogador, Cabenda (Western Africa), Magellan's Straits (Brun). 



Var. Sigma Pant. (1886). — Almost orbicular. L. 0,o4 to O.oes; B. 0,o3 to 0,05 mm. Upper 

 V. with sigmoid axial area, in the middle dilated to a rhomboidal, or irregularly orbicular, central 

 area. Striee radiate 12 to 13 in 0,oi mm. coarsely punctate; puncta about 9 in 0,oi m'm. forming 

 irregular zig-zag-lines. Lower V. with sigmoid median line and transversely dilated central area. 

 Strise 12 to 14 in 0,oi mm. radiate. — C. Sigma Pant. I p. 32 PI. VIII f. 68. C. Oculus Gatis 

 Brun Diat. esp. nouv. p. 18 PL XVIII f 5 (1891). U. sigmo-radians Temp. Brun D. foss. du Japon 

 p. 33 PI. VIII f. 4 (1889). A. S. Atl. CXCVI, 11. 



Marine: Ceylon (Le Tourneur Coll.)! Fos.sil: Japan (Brun Coll.)! S:ta Monica, Calif. (Brun), 

 Atlantic City (Brun). 



Var. sparsipunctata Brun (1891). — Broadly elliptical. L. 0,05 to 0,09; B. 0,o4 to 0,o7 mm. 

 Upper V. with not well defined lanceolate area, large and distant puncta, forming 3 to 4 ir- 

 regular, undulating longitudinal rows. Margin with a row of close puncta (10 in 0,oi mm.). 

 Lower V. with sigmoid median line and narrow, transverse, central area. Axial area indistinct. 

 Striee 11 in 0,oi mm. punctate; puncta 14 in 0,oi mm. equidistant. — C. spars. Brun D. especes 

 nouv. p. 18 PI. XVIII f. 8. A. S. Atl. CXCVI, 13 to 15. 



Marine: Japan, fossil (Brun Coll.)! 



6. C. notata Petit (1877). — Upper V. elliptical. L. 0,02 to 0,o26; B. 0,oi to 0,ni3 mm. 

 with sigmoid axial area, in the middle dilated into a fascia, on f)ne side branched near the 

 margin as to form a horseshoe-like marking. Striee about 17 in 0,oi mm. coarsely piinctate; 

 puncta forming about 5 longitudinal rows on each side of the area. — D. de Campbell p. 10 

 PL IV f. 1. 



Marine: New Zealand (Petit), China! 



7. C. Letourneuri Cl. N. Sp. — Outline elliptical. L. 0,04 to 0,o5; B. 0,03 to 0,o33 mm. 

 Upper V. with straight, linear axial area, separated by two rows of puncta from the narrow, 

 lunate lateral areas. Strise marginal, 9 in 0,oi mm., of coarse puncta, 7 to 8 in 0,oi mm. Lower 

 Valve with straight median line, ending at some distance from the ends. Axial and central areas 

 indistinct. Strise 10, radiate at the ends, punctate; puncta about 16 in 0,oi mm. — PL III f. 10, 11. 



Marine: Colombo, Ceylon (Le Tourneur Coll.)! 



8. C. arctica Cl. (1873). — Elliptical. L. 0,o3 to 0,o4; B. 0,o2 mm. Upper V. with 

 slightly sigmoid axial area. Strise 11 in 0,oi mm., coarsely punctate, crossed on each side of the 

 area by large, lunate depressions, across which the striae continue faintly. Lower V. with sigmoid 

 median line, and transversely dilated central area. Strise 12 in 0,oi mm. radiate, coarsely punc- 

 tate; puncta becoming larger towards the margin. — D. of arctic sea p. 14 PL II f. 11 b (Upper 

 v.). Vega p. 460 PL XXXV f. 4. C. inflexa A. S. Atl. CXCVI, 10? 



Marine: Arctic America! Greenland! Finmark! 



9. C. prsecellens Pant. (1886). — Broadly elliptical. L. 0,0299 to 0,045; B. 0,oi87 to 0,o34 

 mm. Upper V. with broad axial area and large lateral areas separated by three longitudinal rows 

 of large puncta. Strise 16 in 0,oi marginal, composed of about three puncta. Lower V. with 

 straight median line, reaching to the margin, otherwise similar to the upper valve, except that there 

 are two rows of small puncta divergent from the central nodule across the lateral areas. — Pant. 

 I p. 31 PL VIII f. 69. 



Marine: Hungary, fossil (Pant.). 



