I 



49, 



50. 



KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 145 



I Strise about 18 in 0,01 mm M. flexuosa Cl. 



25 — — M. mspidata Cl. 



Valve apiculate M. miniita Grhn. 



— rostrate M. Smithii Thwaitbs. 



Valve rliomboidal 53. 



— linear with cuneate ends M. elliptica v. Daiisei. 



elliptieal to lanceolate 55. 



almost as close as the stria 53. 



less — tlian — 54. 



P^„ J L. about 0,045 mm M. hahamensis Cl. 



' ■ \ L. — 0,075 mm M. affirmata Leud. Fortm. 



{ 



51 i 

 I 



52. [ ^°'^"^' 



' Loculi 4, striae 13 in 0,0 1 mm M. Lancetfula Cl. 



c , ; — 1, — 21 — — M. Rhombuhis Cl, 



(ijoculi 4, striae 

 , - 4' - 



6, — 11 — — M. rhombica Cl. 



\ ~ 8,-14 — — M. pulchella Cl. 



,^ ( Loculi less tlian 7 in 0,0 1 mm 56. 



55. < ^ 



( — more than / — — 58. 



p.p I Strise eoarse, of distant puncta M. affinis Cl. 



{■ 



of close puncta 57. 



„ I Loculi Innate M. notata Pant. 



' \ — rectangnlar M. laminaris Ehb. 



r„ t L. 0,09 mm M. Portieriana Grun. 



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



pj, J Striae about 15 in 0,oi mm M. elegans Lewis 



\ - - 20 - - 60. 



„, I Striae radiate in tlie ends M. elliptica Ag. (M. Smithii var.). 



\ — convergent — — M. lanceolata Thwaites. 



^, J Loculi closer in one end tlian in the otlier M. inwqualis Cl. 



\ Terminal loculi equal in botli ends 62. 



„^ I Loculi between the middle and tbe ends largest M. erythraa Grdn. 



\ Median loculi largest 63. 



„ J Loculi 3 in 0,0 1 mm M. kariana Grun. 



„. , Valye linear M. piisilla Grun. 



elliptieal M. fioridana Cl. 



„j. j Valve witb axial area 66. 



' \ — — lateral areas 68. 



'{ 



66. I 



„„ 1 jjo,K=ia. and central areas uniting 70. 



^^- ^ - not - 73. 



Axial area narrow 67. 



— — broad M. entoleia Cl. 



„^ I Loculi marginal M. japonica Cl. 



\ — inside the margin M. antiqua Cl. 



„ f Lateral areas structureless 69. 



' \ — — punctate or striate 74. 



J Lateral and 



Central nodule stauroid 71. 



not — 72. 



f Strise 9 in 0,01 mm M. cruciata Leud. Fortm. 



71. -j — 17 — — M. euxina Cl. 



\ — 22 — — M. Macdonaldii Geev. 



_„ J Striae flnely punctate M. submarginata Cl. a. Grun. 



I — coarsely — M. baldjikiana Grun. 



,.„ I Loculi 5 to 6 in 0,0 1 mm M. bisidcata Grun. 



■ ( — 10 — — M. rimosa Cl. 



„ . J Areas with faint puncta M. Jelineckii Grun. 



70. I 



j Areai 



longitudinal rows of elongated puncta 75. 



„_ ( Rows of puncta few 76. 



( — — — numerous 78. 



Sv. Vet. Akademieus Handlingar. Bd 27. N:; 3. 19 



