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



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

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



75. M. antiqua Cl. (1893). — V. rliomboid. L. 0,08; B. O, os mm, Median line slightly 

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

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

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

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



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



76. M. cruciata Leud. Fortm. (1879). — V. rhomboid. L. 0,o8 5 to 0,122; B. O.o^z to 0,057 

 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 striee. 

 Strite marginal and axial. Marginal strise 8 to 9 in 0, 01 mm. punctate; puncta 12 in 0, 01 mm. 

 Axial striee short. — Nav. cruc. Leud. Eortm. I). 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: Ceylou (Le Tourneur Coll.)! Manilla (Deby Coll.)! Philippines! 



77. M. Craveni Leud. Fortm. (1879). — V. rhombic-lanceolate. L. 0,iii; 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, 01 mm.) of 

 elongated puncta. Strise marginal and axial. Marginal striee 12 in 0, 01 mm. punctate; puncta 

 about 14 in O 01 mm. — Navicida Crav. Leud. Fortm. D. Ceylan p. 25 Pl. II f. 20. Mastogl. 

 Grav. Cl. Diatomiste I p. 66 Pl. X f. 5. 



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



78. M. Leudugeri Cl. a. Grove (1891). — V. rhombic-lanceolate. L. 0,12; B. 0,o6 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, 01 mm.) of short strise. Strise 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,o5 to 0,u88; B. 0,025 

 to 0,04 3 mm. Median line slightly undulating. Locixli 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 striee. Striee 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 CoU.)! 



80. M, javanica 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. Striee 16 in 0,oi mm. parallel, slightly radiate at the ends, 

 composed of elongated pixncta, forming longitudinal, parallel, 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 tbe depression. — A. S. Atl. CLXXXVIII f. 38. 

 Icon. n. Pl. II f. 22, 23. 



Marine: Java! Sumatra (Grove Coll.)! 



