62 v. T. CLEVE, SYNOPSIS OF THE NAVIOULOID DIATOMS. 



Marine: Balearic Islands! Seychelles (Van Henrck Coll.)! Labuan! Galapagos Islands! Flo- 

 rida! Campeachy Bank (Atl.). 



Var. rhomhica Cl. — V. rhomboid or bi'oadly lanceolate. L. 0, 10.5 to 0,125; B. 0,o56 to 

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

 margin. Strise 12 to 13, puncta 15 in 0, 01 mm. — Part I Pl. IV f. 11. 



Marine: Morocco! Gralapagos Islands. 



Forma minuta. — L. 0,055; B. 0, 035 mm. Strise 19, puncta 22 in 0,o) mm., the latter 

 disposed in longitudinal rows. 



Marine: Sumbava (Kinker Coll.)! Seychelles (Van Henrck Coll.)! 



Var. proxima Jan. — V. broadly lanceolate. L. 0, 105 to 0,15; B. 0,o56 to 0, 07 mm. La- 

 teral areas narrow, subparallel, gradually tapering towards the ends, whei-e they reach the margin. 

 Striis 9 to 10 in 0,oi mm. — N. proxima A. S. Atl. LXX f. 49. Jan. Gazelle Exp. XV f. 5 to 7. 



Marine. 



This variety is nearly akin to var. rhomiica, but has narrow lateral areas and connects 

 N. clavata with certain forms of N. Lyra. 



Var. elongafa Pbrag. (1888). — V. with rounded not rostrate ends. L. 0,ii; B. 0, 043 mm. 

 Strite 14 in 0,oi mm. — Villefr. D. p. 48 Pl. V f. 37. 



Marine: Mediterranean Sea (Perag.). 



This variety connects iV. clavata with JSf. Henneäyi. 



Var. indica GrRBV. (1862). — V. elliptical, rostrate. L. 0,i to 0,i6; B. 0,o56 to 0,ofi8 ram. 

 Lateral areas broad, semilanceolate, with scattered döts. Strite 12, puncta 16 to 17 in 0, 01 mm. 

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

 N. hibernica 0'Meara M. J. VII p. 115 Pl. V f. 1 (1867). N. Hennedyi var. gramilata Leud. Fortm. 

 D. de Ceylon IX f. 88. 



Marine: Hondnras (Grun.), Ceylon! Sumbava (Kinker Coll.)! Macassar Straits! Manilla! 

 Cebu (Eae 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,o i mm., distinctly 

 punctate. The axial strite form a band, broader than that of the marginal strite. Central area 

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



Marine: Campeachy Bank (Atl.). 



28. N. sainoensis Grun. (1881). ^ V. linear with rounded ends. L. 0,o68; B. 0,oi2 mm. 

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

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



Marine: Samoa (Atl.). 



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

 stricted in the middle. L. 0,06; B. 0,027 mm. Lateral areas narrow, constricted in the middle. 

 Strite 10 in 0,oi mm. not distinctly punctate. — 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. approxiniatii Grev. (1859). — V. lanceolate, frequently with cuneate or subrostrate 

 ends, and with parallel margins. L. 0,i>75 to 0,15; B. 0,o4 to O, os mm. Lateral areas narrow, 

 convergent at the ends. Stri;e 7,5 to 10; puncta 10 to 15 in (),oi mm. 



Forma typica. Broadly linear with cuneate ends. L. 0, 11; B. 0,04 6 mm. Stiiic 8, puncta 

 11 ill 0,01 mm. - A^ a.pprn.iimuta Grev. Edinb. N. Ph. J. X p. 28 Pl. IV f. 4. Cl. West. Ind. 

 1). p. 1 l'l. rf. I. N. llcwcdyi var. niccecin^is Pkrao. Villefr. I), p. 47 Pl. V f. 39 (1888). 



Marine: ('alifornia guaiHi (Grev.), Florida! West Indies! Coiiiiccticiit! Ceylon! Madagascar! 

 Taliitj! 



