298 
146 
177. P. obscurum W.Sm. W.Sm. Syn. tab. XX, fig. 206. 
Found only in a sample from LN. 
Area: England, Baleares, 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 Grun. Perag. Pleuros. tab. ll, fig. 5. 
Found only in a sample from KKt. 
Area: Mediterranean, Seychelles, Java. 
— — — var. pulehra Grun. Perag. Pleuros. tab. I, fig. 8. 
KKt (2 samples). 
Area: North Sea, Red Sea, Java, Sumatra. 
Scoliopleura Grun. 
181. §. siamensis Ostr. n.sp. Tab. nostr. Il, fig. 27. 
L. 0,086 mm., b. 0,0075 mm. 
Valve linear with somewhat cuneate apices.* Strie 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 K Km. 
Tropidoneis Cl. 
182. 1. elegans W.Sm. Perag. Diat. d. Fr. tab. XLI, figs. 2—3. 
KKm (2 samples). 
Area: North Sea, Europe, Mediterranean, Adriatic. Between Aden and 
Bab el Mandeb, 
