176 r. T. OLEVE, SYNOPSIS OF THE NAVICIILOID DIATOMS. 



Var. Fulgur Brun (1891). — Almost orbicular. L. 0,03 to 0,04; B. 0,027 to 0,o;iO mm. 

 Upper V. with narrow axial area, and large irregular central area. Stria* 12 in (),oi mm. I'adiate, 

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

 dilated, central area. Stria; 14 in (),oi mm., radiate, coarsely punctate; jmneta 13 in O.oi mm. 

 becoming larger towards the margin. — C. Fulgur Brun D. espeees nov. p. 17 PI. XVIII f. 8. 



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



Var. Sigma Pant. (188()). — Almost orbicular. L. 0,04 to 0,06.5; B. 0,0:5 to 0,o.t mm. Upper 

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

 area. Striae radiate 12 to 18 in (),oi mm. coarsely punctate; punt^ta about 9 in 0,oi mm. forming 

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

 Striae 12 to 14 in 0,oi mm. radiate. - C. Sigma Pant. I p. 32 PI. VIII f. 68. C. Ocuhis Cafis 

 Brun Diat. esp. nouv. p. 18 PI. XVIII f. 5 (1891). C. sigmo-radians Temp. Brun D. foss. du .Ta])()n 

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



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

 Atlantic City (Brun). 



Var. sparsijmncfaia Brun (1891). — Broadly elliptical. L. 0,or> to 0,09; B. 0, 04 to 0.07 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. 

 Strife 11 in 0,oi mm. punctate; puncta 14 in 0,oi mm. eqiiidistant. — (L spars. Brun D. espeees 

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



Marine: Japan, fossil (Brun Coll.)! 



(5. C. iiotjita Petit (1877). -- Upper V. elliptical. L. 0,02 to 0,020; B. 0,oi to 0,01:5 mm. 

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

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

 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. €. Letoiiriieuri Cl. N. Sp. — Outline elliptical. L. 0,o4 to 0,0.5; B. 0,o3 to 0,0.3:? mm. 

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

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

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

 indistinct. Strife 10, radiate at the ends, punctate; puncta about 16 in 0,oi mm. — PI. Ill f. 10, 11. 



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



8. C. arctica Cl. (1873). — Elliptical. L. 0,03 to 0,04; B. 0,02 mm. Upper V. with 

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

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

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

 tate; puncta l)ecoming larger towards the margin. — D. of arctic sea p. 14 PI. II f. 11 h (Upper 

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



Marine: Arcstic America! Greenland! Finmark! 



9. C. praecelleiis Pant. (1886). — Broadly elliptical. L. 0,0299 to 0,04.'-,; 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. Strife 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 PI. VIII f. 69. 



Marine: Hungary, fossil (Pant.). 



