158 p. T. 



69. M. Braunii Grun. (1863). — V. elliptic-lanceolate. L. 0,o4 to 0,095; B. 0,oi4 to 0,027 

 mm. Central nodule large, quadrate, prolonged into narrow horns, as to form a lyriform figure. 

 Loculi 4,5 to 6 in 0,oi mm. quadrate, equal, or the median larger, forming a band ending near the 

 extremities. Striae 18 to 22 in 0,oi mm. parallel, radiate towards the ends, finely punctate; puncta 

 about 25 in 0,o 1 mm. — Verh. 1863 p. 156 PI. IV f. 2. Dannf. Bait. D. PL I f. 4. V. H. Syn. 

 p. 71 PL IV f. 21, 22. A. S. Atl. CLXXXV f. 39, 40, 45; CLXXXVIII f. 4 to 12. M. Kins- 

 mannii Lewis Proced. Ac. Nat. Hist. Philad. p. 13 PL II f. 15 (1865). 



Brackish water: Spitsbergen! Baltic! Caspian Sea! Saxony! North Sea! Mediterranean, 

 Adriatic and Black Seas! Red Sea (Grun.), Japan! Pensacola! Cape May (Lewis). 



70. M. Debyi Cl. (1892). — V. narrow, rhombic-lanceolate. L. 0,055; B. 0,oi4 mm. Median 

 line strongly flexuose. Central area quadrate, expanded into narrow, linear lateral areas, parallel 

 to the median line. Loculi 8 in 0,oi mm. quadrate, forming a narrow band reaching to the ends. 

 Strise 15 in 0,oi mm. slightly radiate, finely punctate. — Diatomiste I p. 161 PL XXIII f. 11. 

 Nav. perduda Pant. Ill Pi. XVIII f. 262 (1893). M. rhomhoidalis Pant. Ill PL XLI f. 563 (1893)? 



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



71. M. Ibaltjikiana Grun. (188 ?). — V. elliptical to elliptic-lanceolate, subacute. L. 0,o42; 

 B. 0,02 mm. Median line undulating. Central area broad, transverse, merging into two narrow, 

 lunate lateral areas. Loculi 6 to 8 in 0,oi mm., equal, rectangular, forming bands, ending at some 

 distance from the apices. Strise 16 to 17 in 0,oi mm., slightly radiate, coarsely punctate; puncta 

 about 16 in 0,oi mm. — M. Braunii var. baltjikiana Grun. in V. H. Types N:o 545. M. haltj. 



A. S. Atl. CLXXXVIII f. 2. Icon. n. PL II f. 11. M. Pethoi Pant. Ill PL XXXVII f. 519 

 (1893). M. neogena Pant, in PL XLI f. 559 (1893). M. Kinherii Pant. Ill PL XLI f. 562 (1893). 

 Navicula Orphei Pant. Ill PL XLII f. 580 (1893). 



Marine: Baltjik, foss. ! 



Var. hullata Cl. — Areas with some few scattered, large puncta. L. 0,o9; B. 0,o24 mm. 

 Strise 17 in 0,oi mm. Puncta 16 in 0,oi mm. 

 Marine: Russia, fossil (Deby Coll.)! 



72. M. Macdonaldii Grev. (1865). — V. lanceolate to rhomboid, subacute. L. 0,035 to 0,045; 



B. 0,013 to 0,017 mm. Median line slightly undulating. Central nodule transversely dilated into 

 a broad stauros. Loculi 3 in 0,oi mm., decreasing in size towards the extremities and with slightly 

 rounded interior edges. Strise 22 in 0,oi mm. slightly radiate throughout, crossed by large, semi- 

 lanceolate areas, punctate; puncta about 22 in 0,oi mm. forming somewhat undulating longitudinal 

 rows. — T. Bot. Soc. Edinb. Vol. VIH p. 237 PL III f. 15. A. S. Atl. CLXXXVII f. 42, 43. 

 Icon. n. PL II f. 21. 



Marine: Corsica! Adriatic! Philippines! Australia (Grev.). 



73. M. euxina Cl. (1892). — V. lanceolate. L. 0,o7; B. 0,o26 mm. Median line undulating. 

 Axial area narrow. Central nodule transversely dilated into a short stauros. Axial area narrow; 

 central area prolonged into the narrow, lunate lateral areas. Loculi 5 in 0, 01 mm. equal, quadrate, 

 forming a band reaching nearly to the ends. Strise 17 in 0,oi mm. coarsely punctate; puncta 

 about 18 in 0,oi mm. forming undulating longitudinal rows. Axial strise short. — Diatomiste I 

 p. 160 PL XXIII f. 9. 



Marine: Baltjik, fossil! 



74. M. entoleia Cl. (1892). — V. lanceolate. L. 0,07; B. 0,025 mm. Loculi 4 in 0,oi mm. 

 of equal size, rectangular, forming bands ending at some distance from the extremities. Median 

 line undulating. Axial area lanceolate, moderately broad. Striae 17 in 0,oi mm. punctate; puncta, 

 about 14 in 0,oi mm., forming longitudinal undulating rows. — Diatomiste I p. 160 PL XXIII 

 f. 8. A. S. Atl. CLXXXVIII f. 15 to 17. 



Marine: Baltjik, foss.! 



