82 p. T. CLEVE, SYNOPSIS OF THE NAVICULOIl) DIATOMS. ■ 



Var. densestriata A. 8. (1881). — Smaller. Costa' 11 in Oji i mm. — Nav. snhnnda r. densesfr. 



A. 8. Atl. LXIX f. 45. 



Marine: California (Atl.). 



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

 L. 0,03.3; B. 0,012; at the constr. 0,oo7 6 mm. Central nodule very small; its horns parallel. 

 Fiirrows narrow, not dilated in the middle. Cost;e sti'ongly di\'ergent towards the margins, \'2 in 

 0,0 1 mm. — Nav. lac. A. S. Atl. XTT f. 54. 



Marine: Java (Atl.). 



10. I), coiigrua Jan. (1881). — V. linear, with broad, capitate ends. L. 0,o6; B. 0,oi36 

 mm. Central nodnle small; its liorns parallel, approximate. Furrows very narrow, slightly dilated 

 in the middle. Costte 12 in 0,oi mm. — N'av. rongr. Jan. A. S. Atl. LXX f. (1(1. 



Marine: ? 



This species is unknown to the autlioi-. The fig. in At). (h)es not show the structure. Pro- 

 bably akin to B. litoralis. 



11. D. Cynthia A. S. (1875). — V. narrow, elliptical, with rounded ends. L. O.o.-i toO,o7.'i; 



B. 0,0 18 to O-oa.") mm. Central nodule small; its horns parallel, approximate. FurroAvs In-oad, 

 linear, forming a narrow elliptical space, a third as broad as the valve. Costa; 7 in (),oi mm., 

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



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

 Tahiti! West Indies! 



Var. (iongata Cl. — L. 0, 13; B. 0,0 3 8 mm. Costee 13 in 0,0 1 mm. 



Marine: Java! 



Var. sihirica Cl. — L. 0,o.'j; B. 0,017 mm. Costa; 11 in 0,01 mm. 



Marine: Cape Wankarema! 



Var. minuia Cl. — L. 0,035; B. 0,oi mm. Costa 15 in 0,01 mm. — A. S. Atl. VIII f. 28. 



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



12. D. mediterraiiea Grfn.. (1875). — V. linear with rounded or cuneate ends. L. 0,o.')3; 

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

 Costa 7 in 0,oi mm. — Nav. gemmata r. medifrrraiiea Gri'N. in A. S. Atl. VIII f. 42. 



Marine: ? 



13. D. lUlinda Jan. (1881). — V. linear, with rounded ends. L. 0,047; B. O.oi.^ mm. 

 Central nodule very small; its liorns parallel, approximate. Furrows bi'oadest in the middle, 

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

 wuuda A. S. Atl. LXX f. 70. 



Marine: ? 



The costa are figured coarsely jiunctate, but nevertheless the general appearance of this 

 species agrees most with 7). incditcrranea. 



14. D. coutigiia A. S. (1875). — V. linear, with rounded or subcuneate ends. L. C,or.(i to 

 0,h; B. 0,0 17 to 0,03 mm. Central nodule large, quadrate, with parallel, approximate horns. 

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

 Costa () to 7 in (),oi mm. Nav. coni. A. S. Atl. VIII f.43. Nav. Tkmnn Pant. I p. 29 PI. X 

 f. 85 (188(i). 



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

 Var. Zechenteri Pant. (1880). — L. 0,072; B. 0,oi7 mm. Costa 8 in O.oi mm. — Nav. 

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

 Marine: Hungary, fossil (Pant.). 



