- 145 - 



Pleurosigma 



169. P. australe Grim. Perag. Diat de Fr. tab. XXXII, figs. 7-8. 

 Found only in a sample from KKm. 



Area: Baléares, Between Aden and Bab el Mandeb, Sumatra, Java, Ceylon, 

 Labuan. 



170. P. d i min util in Grun. Perag. Pleuros. tab. VI, fig. 31. 



Found only in a sample from TK. 

 Area: Baléares, Adriatic. 



171. P. elongatum W. Sm. W. Sm. Syn. tab. XX, fig. 199. 

 KKm, KKt (3 samples). 



Area: Arctic Oceans, Atlantic coasts of America, Europe, Caspian Sea, 

 Java, Sumatra, China, Tahiti. 



172. P. formosuui W. Sm. W. Sm. Syn. tab. XX, fig. 195. 

 KKt, KMn-CLt, LN (10 samples). 



Area: Arctic Oceans, West Indies, Europe, Red Sea, Madagascar, Java. 

 China, Ceylon, Labuan, Tahiti, Hawaii, Pacific Ocean, Galapagos. 



173. P. Grovei Gl. Perag. Pleuros. tab. VIII, fig. 1. 



Solitary in a sample from TK. 

 Area: Malay Archipelago. 



I have only found one moreover not complete specimen which dif- 

 ferred form the typical form in being proportionately broader and in its 

 more open striation. L. 0,43 mm., b. 0,051 mm., transversal striæ 7,4 

 in 0,01 mm., longitudinal striæ 11,1 in 0,01 mm. 



174. P. naTiculaceum Bréb. Gast. Ghali. Exp. tab. XXIX, fig. 14 

 (P. japonicum. Gast.). 



KKm (2 samples). 



Area: North Sea, Mediterranean, Ceylon, Labuan, Java. 



175. P. Normanni Ralfs. V. H. Syn. tab. XVIII, flg. 9. 

 Found only in a sample from KKm. 



Area: Arctic Oceans, Atlantic coasts of America, Europe, Madagascar, 

 Red Sea, Java, Sumatra. 



176. P. Nubecula W. Sm. var. intermedia W. Sm. Perag. Pleuros. 

 tab. V, figs. 27-28. 



KKt, KCg— KLm (8 samples). 



Area: North Sea, Mediterranean, Port Jackson, Rio Grande. 



— — — var. subrecta Gl. Perag. Pleuros. tab. V, fig. 30. 



KKt (3 samples). 



Area: Arctic Oceans, Baléares. 



Botanisk Tidsskrift. 26. Bind. 10 



