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



Var. densestriata A. S. (1881). — Smaller. Costte 11 inO,oi mm. — Nav. subnudav. densestr. 



A. S. Atl. LXIX f. 45. 



Marine: California (Atl.). 



9. D. laciniosa A. S. (1875). — V. strongly constricted in the middle, with rostrate ends. 

 L. 0,033; B. 0,012; at the constr. 0,oo76 mm. Central nodule very small; its horns parallel. 

 FiTrrows narrow, not dilated in the middle. Costee strongly divergent towards the margins, 12 in 

 0,01 mm. — Nav. lac. A. S. Atl. XTI f. 54. 



Marine: Java (Atl.). 



10. D. congrua Jan. (1881). — V. linear, with broad, capitate ends. L. 0,06; B. 0,oi36 

 mm. Central nodule small; its horns parallel, approximate. Furrows very narrow, slightly dilated 

 in the middle. Costse 12 in 0,oi mm. — Nav. congr. Jan. A. S. Atl. LXX f. &&. 



Marine: ? 



This species is unknown to the author. The fig. in Atl. does not show the structure. Pro- 

 bably akin to D. litoralis. 



11. D. Cynthia A. S. (1875). — V. narrow, elliptical, with rounded ends. L. 0,05 to 0,075; 



B. 0,018 to 0,025 mm. Central nodule small; its horns parallel, approximate. Furrows broad, 

 linear, forming a narrow elliptical space, a third as broad as the valve. Costse 7 in 0,oi mm., 

 parallel, radiate at the ends, continued across the furrows. — Nar. Cynthia A. S. Atl. VIII f. 41. 



Marine: Red Sea (Van Heurck Coll.)! Seychelles (Van Heurck Coll.)! Madagascar! Java! 

 Tahiti! West Indies! 



Var. elongata Cl. — L. 0,13; B. 0,038 mm. Costse 13 in 0,oi mm. 



Marine: Java! 



Var. sihirica Cl. — L. 0,05; B. 0,oi7 mm. Costse 11 in 0,oi mm. 



Marine: Cape Wankarema! 



Var. minuta Cl. — L. 0,035; B. 0,oi mm. Costse 15 in 0,oi mm. — A. S. Atl. VIII f. 28. 



Marine: Cape Good Hope (Atl.) Galapagos Islands! 



12. D. mediterranea Gkun.. (1875). — V. linear with rounded or cuneate ends. L. 0,053; 

 B. 0,021 ram. Central nodule small; its horns parallel. Furrows broad, with a row of puncta. 

 Costse 7 in 0,oi mm. — Nav. gemmata v. mediterranea Grun. in A. S. Atl. VIII f. 42. 



Marine: ? 



13. D. munda Jan. (1881). — V. linear, with rounded ends. L. 0,047; B. 0,oi5 mm. 

 Central nodule very small; its horns parallel, approximate. Furrows broadest in the middle, 

 gradually tapering to the ends. Costse 7 in 0,oi mm. marginal, not reaching the furrows. — ■ Nav. 

 munda A. S. Atl. LXX f. 70. 



Marine: ? 



The costse are figured coarsely punctate, but nevertheless the general appearance of this 

 species agrees most with D. mediterranea. 



14. D. contigua A. S. (1875). — V. linear, with rounded or subcuneate ends. L. 0,0 6 6 to 

 0,14; B. 0,017 to 0,03 mm. Central nodule large, quadrate, with parallel, approximate horns. 

 Furrows very broad, linear, crossed by rudimentary costse or by a double row of large puncta. 

 Costse 6 to 7 in 0,oi mm. - Nav. cont. A. S. Atl. VIII f.43. Nav. Thumii Pant. I p. 29 PI. X 

 f. 85 (1886). 



Marine: Japan (Deby Coll.)! Fossil: Oamaru N. Zeal.! S:t Peter, Hungary! 



Var. Zechenteri Pant. (1886). — L. 0,072; B. 0,oi7 mm. Costse 8 in 0,oi mm. Nav. 



Zechenteri Pant. I p. 30 PL XIV f. 118. 

 Marine: Hungary, fossil (Pant.). 



