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



rows, 14 to 15 in 0,oi mm,, curved oblique rows and, near the slightly undulating median line, 

 almost longitudinal rows. — Mastogl. coccon. Grun. Verh. 1860 p. 578 PI. VII f. 14. A. S. Atl. 

 CLXXXVIII f. 43. Icon. n. PL II f. 20. 



Marine: Red Sea! Madagascar! Bahamas (Grove Coll.)! 



23. 0. oamarueiisis Cl. N. Sp. — V. elliptical. L. 0,o5; B. 0,03 mm. Loculi? Median 

 line undulating. V. with very distant large puncta, along the median line 5 in 0,oi mm. Margin 

 with double-rows (4 in 0,oi mm.) of small puncta. — PL II f. 19. 



Marine: Colombo, Ceylon (Le Tourneur Coll.)! Oamaru, New Zealand, fossil! 



Coccon. armata Grbv. (T. M. S. XIV p. 126 PL XI f. 13, 1866) is, to judge from the figure, 

 nearly akin to 0. oamaruensis and to 0. barbadensis. The »marginal tubercles* of this form, 

 mentioned by Gkeville are beyond doubt loculi. All these forms are only insuiHciently described 

 and figured. In this species the puncta are not arranged in decussating rows, so that it strictly 

 does not belong to this division, but in other respects is nearly akin to the latest described 

 species. 



24. M.? (Diadesmis) gallica "W. Sm. (1857). — V. linear elliptical, with rounded ends. 

 L. 0,09 to 0,015; B. 0,003 to 0,004 mm. Loculi small, about 12 in 0,oi mm. forming a band of 

 puncta along the margin. Striae about 28 in 0,oi mm. — Diad. gallica W. Sm. Ann. Mag. N. 

 Hist. XIX p. 11 PL II f. 16. V. H. Syn. PL XIV f. 39. Navicula parvula H. L. Smith Am. Q. 

 J. M. 1878 p. 14 PL III f. 4. 



Fresh water, moist earth etc.: Spetsbergen (Lagst.), Upsala! Brussells (V. H.), Havre ("W. 

 Sm.), America (H. L. Sm.). 



One of the smallest diatoms, characterized by the marginal granulation, which I believe to 

 be loculi. The frustules occur in long bands. 



25. M. marginulata Guun. (1867). — V. narrow lanceolate or linear, obtuse. L. 0,025 to 

 to 0,08; B. 0,0057 to 0,oii mm. Loculi 12 to 14 in 0,oi mm. Strise 22 in 0,oi mm. transverse. 

 — Novara p. 16 PL I f. 12. M. J. 1877 p. 175. A. S. Atl. CLXXXVI, 30. 



Marine: Adriatic, Australia, Samoa, Tahiti, New Zealand, Chile, Honduras (Grun.). 

 I have not seen this small form, which seems to be widely distributed. It may perhaps 

 be the same as M. inaqualis Cl. 



26. M. inae(][nali8 Cl. — V. narrow lanceolate, obtuse. L. 0,o5; B. 0,oi mm. Loculi in 

 one half (valve imagined cut along the transverse axis) of the valve quadrate, 10 in 0,oi mm., in 

 the other more narrow (15 in 0,oi mm.) forming a band along the whole margin. Striae parallel 

 about 30 in 0,oi mm. — PL II f. 15. 



Marine: Australia (Moller), Java! Rodriguez! 



I have seen many specimens all agreeing, so that the diff'erent size of the loculi seems to 

 be a characteristic feature. 



27. M. Rhombulus Cl. N. Sp. — V. rhomboid acute. L. 0,03; B. 0,oo8 mm. Loculi 4 in 

 0,01 mm. with straight interior margin, forming a narrow marginal band. Median line slightly 

 undulating. Striae 21 in 0,oi mm. not distinctly punctate. 



Marine Pensacola (Grove Coll.)! 



28. M. Lancettula Cl. (1892). — V. rhomboid, subacute. L. 0,o3 to 0,o45; B. 0,oo8 to 

 0,01 mm. Central area small, rounded. Median line undulating. Loculi 4 in 0,oi mm., narrow, 

 with somewhat convex interior margins, in a band along the whole margin. Striae 13 in 0,oi 

 mm. composed of distinct puncta forming longitudinal rows, 13 to 20 in 0,oi mm. — Diatomiste 

 I p. 163 PL XXIII f. 18. A. S. Atl. CLXXXVIII f. 24. 



Marine: Cebu, Philippines! Java! 



