160 1'. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. - 



81. M. obesa Cl. (1893). — V. broadly lanceolate, acuminate. L. 0,o4; B. 0,o24 mm. Me- 

 dian line slightly undnlate. Axial area very narrow. Central area quadrate, extending into 

 narrow, lunate lateral areas. Loculi 6 in 0,oi mm. equal, quadrate forming a band, ending near 

 the extremities. Strife 12 in O.oi mm. composed of coarse and distant puneta. Between the stria? 

 and the lateral areas are a few rows of elongated puneta. — Di^itomiste II p. 15 PI. I f. 16. 



Marine: Java! 



82. M. Temperei Cl. (1890). — V. elliptic-lanceolate. L. 0,ii; B. 0,o4 mm. Median line 

 undulate. Axial and central areas indistinct. Loculi? Lateral areas lunate with about 5 undu- 

 lating longitudinal rows of elongated puneta. Striffi 10 in 0,oi mm. punctate; puneta 10 in 0,oi mm. 

 forming undulate longitudinal rows. — Diatomiste I p. 23 PI. Ill f. 3. 



Marine: Japan, fossil! 



Nearly akin to 31. Jelincckii, probably a variety of it. 



83. M. Jelineckii Grun. (1863). — V. rhombical. L. 0,o6 to 0,ii; B. 0,025 to 0,o4r, mm. 

 Median line almost straight. Axial area small, transverse. Loculi 3 to 4 in 0,oi mm. delicate, 

 with rounded interior edges, forming a narrow band, reaching to the apices. Lateral areas large, 

 with faint prolongations of the strite. Strife 13 to 14 in 0,oi mm punctate; puneta 10 to 18 in 

 0,01 mm. forming irregular, oblique rows. — Navic. Jel. Grun. Verb. 1863 p. 151 PI. V f. 12. 

 Masiogl. Jel. Grun. Novara p. 99 PI. I f. U. T. M. Soc. 1877 p. 174 PI. CXCV f. 1. A. S. Atl. 

 CLXXXVII f. 49. Nav. quarnercnsis var. dilatata Petit D. Campbell p. 21 PL V f. 24? Nav. 

 snhrhomJxy'tdca Castr. Voyage challenger D. p. .30 PI. XX f. 4? Mastoql. Jel. var. ifaliea B. A. S. 

 Atl. CLXXXVII f. 48. 



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

 Java! Sumbava (Kinker Coll.)! Manilla (Deby Coll.)! China! West Indies! Brazil! 



Var. fossilis Cl. — L. 0,07; B. 0,03 mm. Striae 12 in 0,oi mm. the median alternately 

 longer and shorter. Puneta 14 in 0,01 mm. 



Marine: Russia, fossil (Deby Coll.)! 



Var. marina (Jan. a. E,abh.?) Cl. — V. rhomboid. L. 0,04 to 0,o7; B. O.oi? to 0,o25 mm. 

 Loculi 4 to 5 in 0,oi mm. Lateral areas narrow, frequently with a row of short strise at their 

 exterior edges. Striae 17 to 18 in 0,oi mm. finely punctate; puneta 25 in 0,01 mm. Nav. mar. 

 Jan. Rabh. D. Honduras p. 10 PI. II f. 16? Icon. n. PI. II f. 18. 



Marine: Honduras (Jan. Rabh.), Manilla (Deby Coll.)! Java! Philippines (Grove Coll.): 



84 M. subniarginatii (^'l. and Grun. (1881). — V. lanceolate subacute. L. 0,o4 to 0,05,5; 

 B. 0,017 to 0,0 18 mm. Median line stxaight. Central area quadrate, merging into the lunate, 

 structureless, or faintly striate, large lateral areas. Loculi rudimentary 5 to 8 in 0,oi mm. StritB 

 19 in 0,0 1 mm. punctate; puneta 23 in 0,oi mm. — N. R. D. p. 4 PI. 1 f. 2. 



Marine: Galapagos Islands! Campeachy Bay (Grun.). 



85. M. Kellerii Pant. (1889), — V. elliptic-lanceolate. L. 0,09 to 0,12; B. 0,o33 to 0,o36 

 mm. Median line undnlate. Central and axial areas small or indistinct. Loculi 4 in 0,oi mm., 

 equal, quadrate, forming a band extending along the whole margin. Depressed lateral areas lunate 

 with crowded longitudinal rows (6 in O.oi mm.) of short strife. StricE 14 to 15 in 0,oi mm. punc- 

 tate; puneta about 10 in 0,oi mm. — Natncula Kellerii Pant. II p. 49 PI. XXIII f. 351. 



Marine: Hungary, fossil, Bory! 



86. M. japoiiica V\.. (1892). — V. elliptic-lanceolate. L. 0,o45 to 0,o65; B. 0,02 to 0,027 

 mm. Median line strongly undulate. Axial area nai-row, distinct. Loculi 6 in 0,oi mm. equal, 

 quadrate, forming a band, ending in the apices. Striae 16 in 0,oi mm., of elongated puneta, 

 forming longitudinal parallel rows, 12 in 0,01 mm.; the two rows next to the median line more 

 distant. Diatomiste 1 p. 162 PI. XXIII f. Hi. 



Marine: Japan (Tempere)! 



