- 149 — 



Area: the main species: West Indies, Brazil, Mediterranean, Seychelles, 

 Madagascar, Java, Sumbava, Manilla, China. 



var marina: Honduras, Manilla, Java, Philippines. 



200. M. Kjellmani Gl. Gl. Vega Exp. tab. XXXV, fig. 6. 

 Found only in a sample from KKm. 



Area: Labuan. 



201. M. labuensis GI. Cl. Vega Exp. tab. XXXV, fig. 5. 

 KKt (14 samples). 



Area: Philippines, Labuan, Billiton. 



M. labuensis surely is very closely related to M. apiculata. 



202. M. lemniscata Lend. Fortm. A. S. Atlas tab. GLXXXVI, 

 figs. 14-15. 



KKm, KKt, LN (5 samples). 



Area: Colon, Ceylon, Sumbava, Manilla, Java, Macassar, Japan, Car- 

 pentaria Bay. 



203. M. Mac Donaldi Grev. Perag. Diat. de Fr. tab. VI, flg. 14. 

 KKm, KKt, KMn— CLt (5 samples). 



Area: Mediterranean, Adriatic, Philippines, Java, Australia. 



204. M. marginulata Grim. A. S. Atl. tab. GLXXXVI, fig. 30. 

 KKt (2 samples). 



Area: Chile, Honduras, Adriatic, Java, Samoa, Tahiti, New Zealand. 



205. M. pusilla Grim. Perag. Diat. de Fr. tab. VI, fig. 36. 

 KKt, s 1. (3 samples). 



Area: Adriatic, Caspian Sea. 



206. M. qvinqvecostata Grim. A. S. Atl. tab. GLXXXVI, figs. 1 — 7 

 & tab. GLXXXVII, fig. 1. 



KKm, KKt, KMn— CLt, KCg-KLm, TK (12 samples). 

 Area: Mediterranean, Adriatic, Cape of good Hope, Sumbava, Madagascar, 

 Ceylon, Labuan, Nicobar, Java, Samoa, Tahiti. 



— — var. elongata Leud. Fortm. A. S. Àtl. tab. GLXXXVI, fig. 12. 

 Found only in a sample from KKt. 

 Area: Madagascar, Ceylon. 



207. M. qvadrinotata sp. nov. Tab. nostr. II, fig. 33. 



L. 0,018 mm., b. 0,007 mm. Striæ 18—20 in 0,01 mm. 



Valve elliptical with very slightly cuneate apices. Striæ parallel 

 composed of punctae, apical area narrow. In the middle a stauros 

 owing to the want of striæ. In every quarter of the valve two 



