KONGL. SV. VET. AKADEMIENS HANDLINGAR. B \Nn 27. N:0 3. 145 



I StrlsB about 18 in 0,oi mm . . . . M. flexuosa Cl. 



I — — 25 — — ... . . . . M. cuspidata Cl. 



gQ I Valve aplculate . . .... .... . . . M. minuta Gbun. 



I — rostrate . . . M. Smithii Thwaites. 



f Valve rhomboidal .... ... 52. 



51. •; — linear with cnneate ends . M. elliptica v. Dansei. 



\ — elliptical to lanceolate ... 55. 



f.a i Locnli almost as close as the strise ... ... . . . . 53. 



' ' \ — less — than — .... 54. 



J L. abont 0,045 mm. . ... ... M. bahamensis Cl. 



I L. — 0,075 mm. . . M. affirmata Lbud. Foetm. 



iLoculi 4, strise 13 in 0,oi mm. . . . . . . M. Lancettula Cl. 

 — 4, — 21 — — . . . . . .M. Rhombulus Cl, 

 — 6, — 11 — — . , . . M. rhombica Cl. 

 — 8, — 14 ■ — — . . . . . M. pulchella Cl. 

 {Locnli less than 7 in 0,01 mm. . ... 56. 

 — more than 7 — — ... . 58. 



,„ ( Striae coarse, of distant puncta . . . M. affinis Cl. 



' \ — of close puncta . . ... 57. 



.„ j Locnli Innate . . . . M. notata Pant. 



" ' \ — rectangular M. laminaris Ehb. 



_„ I L. 0,09 mm M. Portieriana Gbdn. 



\ L. 0,05 mm. or Jess 59. 



p,„ I Strise about 15 in 0,oi mm . M. elegans Levpis 



^^- <■ _ 20 - - 60, 



„„ j Striae radiate in the ends M. elliptica Ag. (M Smithii var.). 



\ — convergent — — M. lanceolata Thwaites. 



53. 



54. 



55. 



■r 



Loculi closer in one end than in the other . M. incequalis Cl. 



Terminal loculi equal in both ends 62. 



Loculi between the middle and the ends largest M. erythrcea Geun. 



Median loculi largest . . 63. 



Locnli 3 in 0,oi mm. M. kariana Gbun. 



— abont 8 in 0,01 mm. 64. 



ve linear M. pusilla Gbun. 



e,.{ 



64 P"'' 



' \ — elliptical M. floridana Cl. 



„, ( Valve with axial area 66. 



■ \ — — lateral areas 68. 



„„ I Axial area narrow 67. 



■ I — — broad .... . . . M. entoleia Cl. 



I Loculi marginal ■ • M. japonica Cl. 



■ I — inside the margin ... M. antiqua Cl. 



-„ f Lateral areas structureless 69. 



■ I — — punctate or striate 74. 



„n f Lateral and central areas uniting 70. 



^^- i - _ - - not - 73. 



I Central nodule stauroid • 71. 



™- ^ _ _ not - 72. 



f Stris 9 in 0,0 1 mm. ... M. cruciata Letjd. Foetm. 



71, I 17 — M. euxina Cl. 



I 22 .3f. Maedonaldii Geev. 



I Strise finely punctate • ■ M. suhmarginata Cl. a. Geun. 



'*■ \ coarsely . . . . ... . . . M. baldjikiana Gbun. 



„„ ( Loculi 5 to 6 in 0,0 1 mm . . M. bisulcata Gbun. 



j 10 M. rimosa Cl. 



Areas with faint puncta • • • M. Jelineckii Geun. 



— longitudinal rows of elongated puncta ... 75. 



_, f Rows of puncta few -76. 



' \ — • — — numerous . . • • .78. 



K. Sv. Vet, Akademleiis Handlingar. Bd 27. Nio 3. 19 



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