— 146 — 



177. P. obscurum W. Sm. W. Sm. Syn. tab. XX, fig. 206. 

 Found only in a sample from LN. 



Area: England, Baléares. Ceylon, Java. 



178. P. rigidum W. Sm. W. Sm. Syn. tab. XX, fig. 198. 



KKm, KKt, KMn-CLt (3 samples). 



Area: Magelhaens Strait, West Indies, Colon, Europe, Red Sea, Madagascar, 

 Borneo, Samoa, Tahiti. 



179. P. scalproides Rabh. var. eximia Thw. V. H. Syn. tab. XXI, 

 fig. 2. 



Solitary in a sample from LN. 



Area: Europe, the coasts of America, Demerara, Bengal. 



180. P. speciosum W. Sm. W. Sm. Syn. tab. XX, fig. 197. 



KKt (2 samples). 



Area: Barbadoes, Europe, Red Sea, China, Java, Sumatra, Labuan, Port 

 Jackson. 



— — — var. mediterranea Grim. Perag. Pleuros. tab. II, fig. 5. 

 Found only in a sample from KKt. 



Area: Mediterranean, Seychelles, Java. 



— — — var. pulchra Gran. Perag. Pleuros. tab. I, fig. 8. 



KKt (2 samples). 



Area: North Sea, Red Sea, Java, Sumatra. 



Scoliopleura Grun. 



181. S. siamensis Östr. n. sp. Tab. nostr. II, fig. 27. 

 L. 0,036 mm., b. 0,0075 mm. 



Valve linear with somewhat cuneate apices. Striæ very fine 

 at right angles to apical axis. In the middle a very slight stauros. 

 Central pores approximated. Terminal nodi inconspicuous. Raphe 

 towards the apices turned in contrary direction, no longitudinal 

 lines visible. 



Solitary in a sample from KKm. 



Tropidoneis Gl. 



182. T. elegans W. Sm. Perag. Diat. d. Fr. tab. XLI, figs. 2—3. 

 KKm (â samples). 



Area: North Sea, Europe, Mediterranean, Adriatic, Between Aden and 

 Bab el Mandeb. 



