176 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID BIATOMS. 



Var. Fulgur Brun (1891). — Almost orbicular. L. 0,o3 to 0,o4; B. 0,027 to 0, 03 6 mm. 

 Upper V. with narrow axial area, and large irregular central area. Strise 12 in 0, 01 mm. radiate, 

 pnnctate; puncta 11 in 0, 01 mm. Lower V. with sigmoid median line and transverse, ontwardly 

 dilated, central area. Strise 14 in 0, 01 mm., radiate, coarsely pnnctate; pnncta 13 in 0, 01 mm. 

 becoming larger towards the margin. — C. Fulgur Brun D. espéces nov. p. 17 Pl. 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, 03 to 0,o.'i 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, 01 mm. coarsely pnnctate; puncta about 9 in 0, 01 mm. 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 Pl. VIII f. 68. C. Oculus Catis 

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

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



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

 Atlantic City (Brun). 



Var. sparsipunctata Brun (1891). — Broadly elliptical. L. 0,o5 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, 01 mm.). 

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

 Striai 11 in 0,oi mm. pnnctate; puiicta 14 in 0, 01 mm. equidistant. — C. spårs. Brun D. espéces 

 nouv. p. 18 Pl. 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,o2 to 0,o26; B. 0, 01 to 0,oi3 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. Strise about 17 in 0, 01 mm. coarsely pnnctate; 

 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 0,033 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, 01 mm., of coarse puncta, 7 to 8 in 0,oi ram. 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, 01 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. 0,02 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 strise continue faintly. Lower V. with sigmoid 

 median line, and transversely dilated central area. Striai 12 in 0, 01 mm. radiate, coarsely pimc- 

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

 V.). Vega p. 460 Pl. XXXV f. 4. C. infl.cxa A. S. Atl. CXCVI, 10? 



Marine: Arctic America! flreenland! Finmark! 



9. C. prjeceliens Pant. (1886). — Broadly elliptical. L. 0,0299 to 0,o4r); B. 0,oi8" to 0,o34 

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

 of large pnncta. Striic 16 in 0,01 marginal, composed of about tliree puncta. Lower V. witli 

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

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

 I p. 31 Pl. VIII f. 69. 



Mai'inp: Hungary, fossil (F'ant.). 



