120 P. T. CLEVE, SYNOPSIS OF TIIE NAVICULOIl) DIATOMS. 



and oblique stria;. almost equidistant, 19 to 20 in 0,oi mm. — Pleur. rectum DoxK. T. M. S. VI 

 p. 23 Pl. III f. 6. AmiMprora Ealfsii Arnott M. J. VI p. 91 (18Ö8) ad spec. authentica. Donlänia 

 reda V. H. Syn. p. 119 Pl. XVII f. 9. Per. IX f. 4. F. Lorenzii Grux. Veili. 1800 p. 5r)8 

 Pl. VI f. 4. Per. VII f. 17. 



Marine: Nortli Sea! Mediterranean Sea! Adriatic! Labuan! Cliina! Port Jackson! Florida! 



Var. intermedia Per. (1891). — V. more lanceolate, witli less asymmetrical ends. — Donhinifi 

 reda var. int. Per. p. 30 Pl. IX f. 7, 8. 



Marine: Cherbonrg (Per.), Firtli of Tay! 



Var. Thmmi Cl. (1891). — L. 0,i to 0,i3; B. O.oii to 0,ni2 mm. T.S. : L.S. -V.,,, ^s j^, " ..^ 

 in 0,(,i mm. — TJonUnia Thumii Per. p. 30 Pl. VII f. 28, IX f. 10. 



Marine: Balearic Islands! Seyclielles! Sumatra! 



Var. minuia Donk. (1858). — Smaller. L. 0,oc; B. 0,oi2 mm. Striae 19 in 0,oi mm. — 

 Fleur. minutum DoNK. T. M. S. VI p. 24, Pl. III f. 8. Donhma min. Ralfs in Pritcli. Inf. p. 921 

 (1861). Per. IX f. 9. 



Marine: Neweastle! Firtli of Tay! 



27. O. liiieave Grun. (1880). — V. narrow, linear, almost straight, nnilaterally narrowed 

 towards tlie ends. L. 0, 17 to 0,2 6; B. 0,oi to 0,oi5 mm. jMedian line sigmoid, strongly excentric. 

 T.S. : L.S. -0/,4, -V26 i" *^''0' 11"^^- ~ Plwc- lineare Grun. A. B. p. 59. Per. IX f. U (median line 

 incorrectly represented as central). 



Marine: Adriatic! Seychelles (Grun.), Port Jackson! Colon! 



Var. longissima Cl. (1881). — V. very narrow, witli obliquely rounded ends. L. O.ie to 

 0,1-; B. 0,007 mm. T.S. : L.S. «/.,,, 22 •.,,_ in 0,01 mm. — Plrnr. {Doid:?} Jong. Cl. X. R. D. p. i! 

 Pl. I. f. 8. Per. VII f. 16. 



Marine: Mediterranean Sea (Gulf of Naples, Balearic Islands)! 



28. Q. augustum Donk. (1858). — V. very convex, thin, linear, with uuilaterally attenuate. 

 acute ends. L. 0,iä6 to 0,14; B. 0,oi.-) mm. Median line diagonal in the middle and then marginal. 

 T.S. : L.S. -«/o.. in 0, 01 mm. — Plnir. angustum Doxk. T. M. S. VI p. 24 Pl. III f. 9. Bonhinia 

 angusta Ralfs "in Pritcli. Inf. p. 921 (1861). Per. IX f. 3. 



Marine: England (Donk.), Balearic Islands! 



Var. siimatrana Ch. — Less convex. L. 0,14; B. 0,oi8 mm. T.S. : L.S. '" .,, in O.oi mm. 

 Median line less excentric. 



Marine: Sumatra (Deby Coll.)! 



29. P. (Rhoicos.) compactiim Grev. (1857). — Frustule arcnate, witli dissimilar valves. 

 V. short, linear, nnilaterally attenuated to the obliquely rounded ends. L. 0,o89 to 0,4; B. O.oi:-, to 

 0,05 mm. Upper valve with straight diagonal, median line T.S. : L.S. "/'is. '^Aa- '^.21' ^'/lo i" f-'" """• 

 Lower valve witli strongly excentric and sigmoid median line. T.S. : L.S. "^ ...j, "/'jg, '".,.>, '^.i,, 

 '%) '7"4 in 0,01 mm. — Lotvcr valve: Pleur. comp. Grev. M. J. V. p. 12 Pl. III f. 9. Donhhiia 

 comp. Ralfs in Pritcli. Inf. p. 921 (1861). Rhoic. comp. Grun. M. M. J 1877 p. 182. Per. 

 p. 33 Pl. X f. 7, 8. Rhoic. oceanicum Per. 1. c. f. 5, 12, 15. Rhoic. corsicauum Per. 1. c. Rhoic. 

 Antillarum Cl. West. Ind. D. p. 9 Pl. II f. 14. Plenr. Smifhianum Castr. Voyage Cliallenger D. 

 p. 38 Pl. XXVIII f. 6? Donl-inia antiqua Grove and Sturt J. Queck. M. Cl. III [2] p. 133 (1887)? 

 — f/iy-ier valve: Rhoic. Reichardtianum Grun. Hedwigia VI p. 11 (1867). M. M. J. 1877 p. 181 

 Pl. CXCV f. 19. Rhoic. eompactum Per. p. 33 Pl. X f. 6, 8, 10, 13. 



Marine: La Rochelle (Petit Coll.)! Mediterranean Sea! Adriatic! Red Sea! Sumatra! Philip- 

 pines! Port Jackson! Samoa! Tahiti! Galapagos Islands! Honduras (Grun.). "West ludies! 



Var. constrida Grun. (1877). — V. slightly constricted in the middle, with subcuneate ends. 

 L. 0,13; B. 0,02 mm. TS. : L.S. '7,9, '% "^ 0,oi mm. — Rhoic. (Reichardtii var.?) eonsir. Grun. 

 M. M. J. 1877 p. 181. 



Marine: Honduras (Grun.)! Adriatic (Grun.)! 



