144 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



„„ f Rows of puncta 7 to 10 in 0,1 mm M. cribrosa Gktjn. 



'^"- t — — 14 to 15 — - 21. 



/ Loculiferous rim broad M. cocconeiformis Grun. 



■ \ — — narrow M. Hnnuathiana Grun. 



„„ ) Valve witli irregnlar large puncta , M. oamaruensis Cl. 



'I — — close striffl M. ovata Gedn. 



OJ. J ^^'^^ withont axial or lateral areas 25. 



"t — with — — — 65. 



„j. / Striae crossed by several longitudinal fnrrows 2G. 



'^^- \ - not - - - - - - 27. 



„„ J Valve elliptic-laneeolate or rhomboid M. qiiinquecostata Grun. 



g , Valve elliptical 23, 



lanceolate 24. 



( Valv^ 



\ — lanceolate, acnminate M. seriata Cl. 



uncta in straight longitudinal rows, stronger than the transverse 28. 



ransverse rows of puncta stronger tlian the longitudinal 31. 



j Puncta in straight longitudinal rows, stronger than the transverse 28. 



'^'- \T 



„„ I Transverse strise 12 in 0,oi mm M. lineata Cl. a. Grove. 



I — — 17 to 30 in 0,01 mm 29. 



(j„ J Loculiferous rim distant from the margin M. acuta Grun. 



"I — — marginal 30. 



„„ ■ Central area distinct M. arata Cl. 



— indistinct M. exarata Cl. 



I 



/ Valve with longitudinal lines parallel to the median line 32, 



■ I — without — — — — — — 38. 



j Longitudinal lines combined with the central area 33. 



• \ — — not — - — — 35. 



I Small. L. 0,025 to 0,028 mm M. piimila Grun 



I Larger. L. 0,04 to 0,09.1 mm 34. 



j Loculi abont 8 in 0,oi mm M. Dehyi Cl 



'( — — 5 — — M. Braunii Grun 



„,, I Longitudinal lines close to the median line 36. 



' ' \ — — distant from — — 37. 



■ Valve elliptic-laneeolate M. npicnlnta W. Sm. 



. , linear with cuneate ends M. Inbuensis Cl. 



' — broad, elliptical, rostrate M. Citrns Cl. 



— lanceolate, rostrate M. hältica Grun. 



„_ ( Loculi 4 in 0,oi mm M. Piscieulns Cl. 



t - 8 — - M. Peragalli Cl. 



„„ I Loculi of equal size 39. 



— — unequal — 61. 



•M i Valve very small. L. 0,oi mm M. gnllica W. Sm. 



\ — larger. L. 0,02 mm. and more 40. 



.„ f Loculi few 41. 



\ — numerous 42. 



... j Loculi 2 on each side M. capitata Brun. 



' \ — 4 — — M. exigua Lewis. 



.„ ( Loculiferous rim inside the margin M. paradnxa Grun. (M. Smithii vnr.). 



' \ — — marginal 43. 



.„ I Valve constricted in the middle M. constricfn Cl. 



■ I — not — — — 44. 



. , j Valve rostrate or apicnlate , 45. 



■ I — not - 51. 



,p I Puncta forming almost straight longitudinal rows 46. 



i — not — — — — — 48. 



.|, j Median line strongly undnlating M. wuhtlafn Grun. 



I — — slightly — or straight 47. 



. J Ends rostrate-capitate M. Onesii Cl. 



\ — slightly rostrate M. fallax Cl. 



^„ I Median line strongly flexunse 49. 



'I — — slightly — 50. 



