KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 27. N:0 3. 159 



A similar, not described, and insufficiently figured, form seems to be M. obtusa var. fluvia- 

 ilis Brun in A. S. Atl. CLXXXVIII f. 18. 



75. M. antiqua Cl. (1893). — V. rbomboid. L. 0,o8; B. 0,o3 mm, Median line slightly 

 undulating. Axial area a narrow, lanceolate space. Loculi 6 in 0,o i mm., equal, quadrate, forming 

 a band inside the margin and ending at some distance from the extremities. Striae 18 in 0,oi 

 mm. parallel, very slightly radiate at the ends, punctate; puncta 18 in 0,oi mm., forming undu- 

 lating longitudinal rows. — Diatomiste II p. 16 PL I f. 19. 



Marine: Karand, Hungary, fossU (Deby Coll.)! 



76. M. cruciata Leud. Fortm. (1879). - V. rhomboid. L. 0,o85 to 0,122; B. 0,053 to 0,o57 

 mm. Central nodule transversely dilated into a stauros, not reaching to the margins. Median 

 line slightly undulating. Loculi? Lateral areas large, semilanceolate, crossed by faint stria?. 

 Striae marginal and axial. Marginal striae 8 to 9 in 0,oi mm. punctate; puncta 12 in 0,oi mm. 

 Axial striae short. — Nav. cruc. Lecd. Fortm. D. Ceylan p. 25 PL II f. 19. Mast. cruc. Cl. Dia- 

 tomiste I p. 65 PL X f . 4 (1891). A. S. Atl. CLXXXVII f. 50. 



Marine: Ceylon (Le Tourneur CoU.)! Manilla (Deby Coll.)! Philippines! 



77. M. Craveni Leud. Fortm. (1879). — V. rhombic-lanceolate. L. 0,ui; B. 0,o56 to 0,o6 

 mm. Median line almost straight. Central area irregularly rounded, moderately large. Loculi? 

 Lateral areas large, with numerous and irregular longitudinal rows (about 7 in 0,oi mm.) of 

 elongated puncta. Striae marginal and axial. Marginal striae 12 in 0,oi mm. punctate; puncta 

 about 14 in 0,oi mm. — Navicula Crav. Leud. Fortm. D. Ceylan p. 25 PL II f. 20. Mastogl. 

 Crav. Cl. Diatomiste I p. 66 PL X f. 5. 



Marine: Colombo, Ceylon (Le Tourneur CoU.)! 



78. M. Leudugeri Cl. a. Grove (1891). — V. rhombic-lanceolate. L. 0,12; B. 0,06 mm. 

 Median line undulating. Central area small, subquadrate. Axial area very narrow. Loculi 3 in 

 0,01 mm., quadrate, equal, forming a band, reaching to the extremities. Lateral areas broad, semi- 

 lanceolate, with numerous longitudinal rows (about 7 in 0,o 1 mm.) of short striae. Striae marginal 

 and axial, 14 in 0,oi mm. punctate; puncta 15 in 0,oi mm. forming undulating, longitudinal rows. 

 — Diatomiste I p. 65 PL X f. 3. A. S. Atl. CLXXXVI f. 13. 



Marine: Macassar Straits! Singapore! Java! 



79. M. lemniscata Leud. Fortm. (1879). — V. rhombic-lanceolate. L. 0,05 to0,088; B. 0,025 

 to 0,04 3 mm. Median line slightly undulating. Loculi 5 to 6 in 0,oi mm. quadrate, forming a 

 band reaching to the ends. Central area small, quadrate. Lateral areas large, semilanceolate, 

 with a few (3 to 4) longitudinal rows of short striae. Striae 15 to 16 in 0,oi mm. punctate; puncta 

 15 to 20 in 0,01 mm. — D. de Ceylon p. 35 PL III f. 29. A. S. Atl. CLXXXVI f. 14. Icon. n. 

 PL II f. 26. M. decora Leud. Fortm. 1. c. f. 32. 



Marine: Madagascar (Van Heurck and Kinker Coll.)! Ceylon! Sumbava (Kinker CoU.)! 

 Manilla (Deby CoU.)! Macassar Straits (Grove CoU.)! Carpentaria Bay! Japan! Colon (Deby Coll.)! 



80. M. javauica Cl. (1893). — V. rhomboid-lanceolate. L. 0,ii; B, 0,032 mm. Median line 

 slightly undulating. No axial or central areas. Loculi 3 in 0,oi mm. equal, rectangular, forming 

 a narrow band, reaching to the ends. Striae 16 in 0,oi mm. parallel, sHghtly radiate at the ends, 

 composed of elongated puncta, forming longitudinal, paraUel, straight rows, 12 in 0,oi mm. Sur- 

 face of the valve with a shallow, narrow, longitudinal depression, close to the median line. The 

 longitudinal rows of puncta are more distant on the depression. — A. S. Atl. CLXXXVIII f. 38. 

 Icon. n. PL U f. 22, 23. 



Marine: Java! Sumatra (Grove Coll.)! 



