62 1'. T. CILEVE, .SYNOPSIS OF THE NAVICULOll) DIATOMS. - 



Marine: Balearic Islands! Seychelles (Van Heuruk Coll.)! Labuan! Gralapagos Islands! Flo- 

 rida! Campeachy Bank (Atl.). 



Var. rhomhica Cl. — V. rhomboid or broadly lanceolate. L. 0,io5 to 0,i2.'j; B. O,o:-,fi to 

 0,0 7 5 mm. Lateral areas broad, tapering from the middle to the ends, where they reach the 

 margin. Stria3 12 to 13, puncta 15 in 0,oi mm. — Part I PI. ,1V f. 11. 



Marine: Morocco! Galapagos Islands. 



Forma minida. — L. 0,055; B. U,o35 mm. StrijE 19, puncta 22 in U,oi mm., the latter 

 disposed in longitudinal rows. 



Marine: Snmbava (Kinker Coll.)! Seychelles (Van Heurck Coll.)! 



Var. proxima Jan. — V. broadly lanceolate. L. 0,io5 to 0,1.5; B. 0,o56 to 0,07 mm. La- 

 teral areas narrow, subparallel, gradually tapering towards the ends, where they reach the margin. 

 Stria- f) to 10 in 0,oi mm. — N. proxima A. S. Atl. LXX f. 49. Jan. Gazelle Exp. XV f. 5 to 7. 



Marine. 



This variet}^ is nearly akin to var. rhoinhica, but has nari'ow lateral areas and connects 

 N. clavata with certain forms of N. Lyra. 



Var. elongata Perag. (1888). — V. with rounded not rostrate ends. L. 0,ii; B. 0,o4 3 mm. 

 Striie 14 in 0,oi mm. — Villefr. D. p. 48 PI. V f. 87. 



Marine: Mediterranean Sea (Perag.). 



This variety connects N. clavata with N. Ucnnedyi. 



Var. indica Grev. (1862). — V. elliptical, rostrate. L. 0,i to 0,i6; B. O,()ofi to 0,068 mm. 

 Lateral areas broad, semilanceolate, with scattered dots. StriiB 12, puncta 16 to 17 in 0,oi mm. 

 — N. indica Grev. T. M. S. 1862 p. 95 PI. IX f. 13. Janisch Gazelle Exp. XV f. 15, 19, 20. 

 N. hihernica O'Meara M. J. VII p. 115 PI. V f . 1 (1867). N. Hmnedyi var. granulata Leud. Fortm. 

 D. de Ceylon IX f. 88. 



Marine: Honduras (Grun.), Ceylon! Snmbava (Kinker Coll.)! Macassar Straiis! Manilla! 

 Cebu (Rae Coll.)! 



27. N. diffluens A. S. (1874). — V. elliptical with broad rostrate and truncate ends. 

 L. 0,045; B. 0,023 mm. Lateral areas linear, slightly convergent. Strife 10 in 0,01 mm., distinctly 

 punctate. The axial striae form a band, broader than that of the marginal stri;B. Central area 

 dilated towards the lateral areas. — Atl. II f. 15. 



Marine: Campeachy Bank (Atl.). 



28. N. samoensis Grun. (1881). — V. linear with rounded ends. L. 0,o68; B. 0,012 mm. 

 Lateral areas narrow, more approximate to the margin than to the median line, convergent at 

 the ends. Strife 10 in 0,oi mm. — A. S. Atl. LXX f. 41. 



Marine: Samoa (Atl.). 



29. N. (listenta A. S. (1874). — V. elliptical, rostrate, with slightly convex margins, con- 

 stricted in the middle. L. 0,o6; B. 0,o2 7 mm. Lateral areas narrow, constricted in the middle. 

 Stria'. 10 in 0,oi mm. not distinctly piinctate. — Atl. II f. 14. 



Marine: Campeachy Bank (Atl.). 



Seems to be a variety of some of the forms intermediate between N. clavata and N. Lyra. 



30. N. approxiniata Grev. (1859). — V. lanceolate, frequently with cuneate or siibrostrate 

 ends, and witli parallel margins. L. 0,o7 5 to 0,15; B. 0,o4 to 0,o8 mm. Lateral areas narrow, 

 convergent at the ends. Striae 7,5 to 10; puncta 10 to 15 in 0,oi mm. 



Forma typica. Broadly linear with cuneate ends. L. 0,ii; B. 0,o4 6 mm. Strite 8, puncta 

 11 in 0,01 mm. — N. approximata Grev. Edinb. N. Ph. J. X p. 28 PI. IV f. 4. Cl. West. Ind. 

 D. p. 4 PI. I f. 1. A. Hennedyi var. niceeensis PeraOx. Villefr. 1). p. 47 PL V f. 39 (1888). 



Marine: California guano (Grev.), Florida! West Indies! Connecticut! (Jeylon! Madagascar! 

 Tahiti! 



