149 301 
_ Area: the main species: West Indies, Brazil, Mediterranean, Seychelles, 
Madagascar, Java, Sumbava, Manilla, China. 
var marina: Honduras, Manilla, Java, Philippines. 
200. M. Kjellmani Cl. Cl. Vega Exp. tab. XXXV, fig. 6. 
Found only in a sample from KKm. 
Area:- Labuan. 
201. M. labuensis Cl. 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 Leud. 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 ( samples). 
Area: Mediterranean, Adriatic, Philippines, Java, Australia. 
204. M. marginulata Grun. A.S. Atl. tab. CLXXXVI, fig. 30. 
KKt (2 samples). 
Area: Chile, Honduras, Adriatic, Java, Samoa, Tahiti, New Zealand. 
205. M. pusilla Grun. Perag. Diat. de Fr. tab. VI, fig. 36. 
K Kt, s 1. (3 samples). 
Area: Adriatic, Caspian Sea. 
206. M. qvinqvecostata Grun. A.S. Atl. tab. CLXXXVI, figs. 1—7 
& tab. CLXXXVII, 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. Atl. tab. CLXXXVI, 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. Striz 18—20 in 0,01 mm. 
Valve elliptical with very slightly cuneate apices. Striee parallel 
composed of punctae, apical area narrow. In the middle a stauros 
owing to the want of striez. In every quarter of the valve two 
