44 p. T. CLEVE, SYNOPSIIS OF THE NAVICI'LOID DIATOMS. - 



42. P, (Doukiiiiii) Ciiriiiatuni I)o\k. (1858). — V. very convex, unilaterally tapering from 

 the middle to the acute end.s. L. 0,i to 'K la; B. Ooi to 0,oi3 mm. iMedian line almost diagonal in 

 the middle and then closely following the convex margins. Transv. and obi. stri;e '7i8' ''Ad i" 

 0,0 1 mm. — DoNK. T. M. S. VI p. 23 PI. Ill f. 5. Bovkiina car. Ralf in Pritch. Inf. p.' 921 

 (1861). Per. IX f. (>. 



Marine: Sea of Kara! Davis Strait! North Sea! Balearic Islands! Japan, fossil (Brun coll.)! 



■43. P. speciosum W. Sm. (1852). — V. linear, with unilaterally rounded ends. L. 0,i8 to 

 0,27; B. 0,023 to (),o2.'b luui. Median line strongly excentric towards the ends. Transv. and obi. 

 striae ^Vib- ''7n' '"/n. ""i8' ""in in 0,oi mm. — ^^^ Sm. Ann. Mag. N. H. [2] IX p. 6 PI. 1 f. 3. 

 B. D. I p. (;3 PI. XX f. 197. Per. II f. 13 to IC. 



Marine: North Sea! Mediterranean Sea! lied Sea! .lava! Sumatra! Labuan! China! Port 

 Jackson! Barbados! 



Var. (jruciJis Pek. (1891). — More narrow. L. 0,2.^,; B. 0,oi5 mm. Transv. and obi. stri.e -"/',<, 

 in 0,0 1 mm. Per p. 6 PI. II f. 19. 



Marine: Sumatra (Per.). 



Var.? Jacatiica Per. (1891). — L. 0,07; B. 0,02 to 0,2:! mm. Transv. and obi. strire -"/,,| i" 

 0,01 mm. — Per. p. 6 PL 11 f. 17, 18. 



Marine: Java, Sumatra (Per.). 



Var.? ahrupia Per. (1891). — Same as var. jaxanica, but with ()l)li([uely truncate ends. — Per. 

 p. (3, PL II f. 11. 



Marine: Java, Sumatra (Per.). 



Var. mediterranea Grun. (1880). — Linear, with unilaterally rounded ends. L. 0,21 toO,;!2; 

 B. 0,0 18 to 0,0 2 6 ram. Median line strongly excentric, coincident for a considerable distance with 

 the convex margin. Transv. and obi. strite '^''/i.)..)' '^H' 'Vh ii^ ^Xoi mm. — F. ohscarum var. mcdit. 

 Grun. a. U. p. 49. Per. II f. 5. 



Marine: Mediterranean Sea! Seychelles (Grun.), Java! 



Var. pidchro, Grun. (1860). — V. and median line as in \ar. inedil. L. 0,3 to 0,6; B. 0,023 

 to 0,04 mm. Transv. and obi. strise '^/,o, '""/n, 'V,,, '%■> i" *''<'i ""n- — F. pahltr. Grun. Verb. 

 1860 p. 556 PL VI f. 2. Per. I f. 8. 



Marine: North Sea! Red Sea (Grun.), Java! Sumatra! 



Var.? iortuosa Cl. (1881). — V. lanceolate, slightly sigmoid, with unilaterally rounded ends. 

 L. 0,07 6; B. 0,012 to 0,0 13 mm. Median line strongly sigmoid and ver^^ excentric. Transv. and 

 obi. stride 22/20 "i <^'0' m™- — ^- ^«''''- <^L. N. R. D. p. 5 PL I f. 6. Per. II f. 12. 



Marine: Balearic Islands! 



44. P. inajus Grun. (1880). — • V. lanceolate, gradually tapering from tlie middle to the 

 obtuse ends, slightly sigmoid. L. 0,2 to 0,4; B. 0,024 to 0,o52 ram. Median line nearly straight 

 in the middle, excentric towards the ends. Oblique stri;e form in the middle of the valve an ob- 

 tuser angle than on other parts of the valve. Transv. and obL stria- '■'^,'i:(..-, (Grun.) '^',3, i^/\,, 

 i«/j., -"/,j, in 0,01 mm. — F. specio.snm var.? major Grun. A. D p. 49. F. a f fine var. inferrnptutn 

 Per. PL IV f. 1 to 3. Fl. majus Icon. n. PL IV f. 15. 



Marine: Mediterranean Sea! Sumatra! 



45. P. Heros Cu. N. Sp. — \ . lanceolate, slightly sigmoid, gradually tapering from the 

 middle to the obtuse ends. L. 0,4; B. 0,08.^ mm. J\Iedian line straight, somewhat excentric towards 

 the ends. Transv. and obi. striai 'Vin i'l 0,oi mm. — PL IV f. 20. 



Marine: Macassar Straits (Grove's Coll.)! 



This foi'in is closely allied to F. mciju.s, being somewhat broader. The striae are coarser and 

 in the same direction in the middle as elsewhere. It is also nearly akin to, P. formosnm v. lougis- 

 sinia, which is more sigmoid and has a more excentric median line. 



