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. l(S(iU p. 57(S PI. N\i f. 1-4. A. S. Atl. 

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



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



23. 0. oamaruensis Cl. N. Sp. — V. elliptical. L. 0,o5; B. 0,o3 mm. Loculi? Median 

 line undulating. V. with very distant large puncta, along the median line 5 in 0,0 1 mm. Margin 

 with double-rows (4 in 0,01 mm.) of small puncta. — PL II f. 19. 



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



Coccon. arniuta Grev. (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. harhadensis. The >marginal tubercles* of this form, 

 mentioned by Greville are beyond doubt loculi. All these forms are only insufficiently described 

 and figured. In this species the puncta are not arranged in decussating rows, so that it stri(;tly 

 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. 0,0'j to 0,015; B. 0,o().! to 0,()(t4 mm. Loculi small, about 12 in 0,oi mm. forming a band of 

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

 Hist. XIX p. 11 PL II f. 16. V. H. Syn. PL XIV f. 39. Navkula parvnla 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, margliiulsita Grun. (1867). — V. narrow lanceolate or linear, obtuse. L. 0,02.5 to 

 to 0,08; B. 0,0057 to 0,011 mm. Loculi 12 to 14 in 0,oi mm. Stria:". 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 31. incequcdis Cl. 



"IQ. M. inaequalis Cl. — V. narrow lanceolate, obtuse. L. 0,05; 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. Stria' 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 different size of the loculi seems to 

 be a characteristic feature. 



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

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

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



Marine Pensacola (Grove Coll.)! 



28. M. Lancetiula Cl. (1892). — V. rhomboid, subacute. L. 0,o3 to 0,045; B. 0,008 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. Striaj 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 £ 18. A. S. Atl. CLXXXVIII f. 24. 



Marine: Cebu, Philippines! Java! 



