— 150 — 



marginal loculi, which are difficult to see, as this small form is very 

 hyaline. The specimens in which I could not see the four pair of 

 loculi otherwise agree in shape and structure with those where the 

 loculi are visible. 



KKt, LN, TK, KCg-KSm (4 samples). 



208. M. rhombica Gl. Gl. Vega Exp. tab. XXXV, fig. 9. 

 Found only in a sample from KCn. 



Area: Labuan. 



209. M. Smithi Thw. var. amphicephala Grim. A.S. Atl. tab. CLXXXV, 

 figs. 13 — 14 = M. capitata Grev. Gnfr. Gl. Syn. II, p. 152. 



KKm. 



Area: England, Baltic, Scotland , Morocco, Calcutta {M. capitata of G r e v i 1 1 e). 



210. M. parvula Östr. n. sp. Tab. nostr. II, fig. 35. 



L. 0,021 mm., b. 0,009 mm. Striæ 20 in 0,01 mm., loculi 5 — 6 

 in 0,oi mm. Valve elliptical with short rostrate apices. Apical area 

 narrow but present. 



KKt (2 samples). 



This small species reminds somewhat of M. Smithi Thw. var. conifera 

 Brun. (Perag. Diat. de Fr. tab. VI, fig. 41), but owing to the narrow central 

 area it ought to be considered a separate species. 



211. M. sp. Tab. nostr. II, fig. 36. Gnfr. A. S. Atl. tab. GLXXXVII, 

 fig. 41. 



L. 0,061 mm., b. 0,02 mm. Striæ 16—17 in 0,01 mm. towards 

 the apices slightly curved, loculi 10—11 in 0,01 mm. Raphe slightly 

 undulated, narrow transapical area. 



KKt (1 sample). 



The form figured by A.S. (from Baltschick) is referred to M. elegans 

 Lewis in the description of plates, but the present form does not agree 

 with any of the figures referred by GI. Syn. II, P. 154 to Mast, elegans. 



212. M. sp. Tab. nostr. II, fig. 32. 



L. 0,066 mm., b. 0,028 mm. Striæ 8 — 9 in 0,01 mm., loculi 4 

 in 0,oi mm.? 



Valve lanceolate with somewhat rostrate apices. Median line 

 straight. Apical area very narrow. Striæ composed of punctae 

 forming decussate lines. Loculi difficult to see. In one specimen 

 I have seen them near the apex, to which they reach. 



KKt, s.l. (2 samples). 



I think this species is nearest to M. asperula Grun. (Gl. Le Diat. I, 

 tab. IX, fig. 12), but I have preferred not to state it as a separate species, 

 as I have only seen specimens either without or with incomplete loculi- 

 ferous rim. 



Area of M. asp.: Baléares, Seychelles, Java, Gebu. 



