24 P. T. OLEVE, SYNOPSIS OF THE NAVIOHLOID DIATOM.S. 



4, 



Q I Valve thin . . ., ^. ^..^ ,| . ,. .,._,,,..,_.[..,. . j.; 4. 



\ — solid T. solidula Cl. 



Frustule in zonal view ulliptical T. antarctica Cl. 



— — reetangnlar T. memhranricen Cl. 



^ ) Valve iiearly flat T. Innga Cl. 



\ — elevated , 6. 



„ ) AVing close to tlie keel , T. approximnta Cl. 



I — not — 7. 



_ . Central area indistinct or small T. Lepidoptera Greg. 



~ distinct — T. maxima Greg. 



{ 



I 



II. Plagiatropis Pfitzer, median line exceiitrio; keels of tlie valvp.s in contrary direetions. 



J Striae coarse and distant T. Zebra Cl. 



■ \ — close — 2. 



(, j Strife crossed by blank, longitndinal bands T. seriata Cl. 



„ J Valve not striate along the margin 4. 



'I — striate to the margin 5. 



. I Transverse striae about 15 in 0,0 1 mm T. japmiica Cl. 



■ \ — — — 19 — T. semistriata Gkun. 



j, J Frustule constricted in the middle U. 



' \ — not or slightly 9. 



i 



^ / Valve broad T. sumbareihfis Cl. 



\ — narrow 8. 



„ J L. about 0,os ram T. gibherula Grun. 



) — 0,14 mm ;. i. T. chinensis Cl. 



Valve narrow, almost linear 10. 



„ , Wing or longitudinal band instinct T. såmoensis Grun. 



— — distinct 7. 



{ 



9. ^ 



broader, lanccolate 11. 



.,„ j L. 0,2 to 0,27 mm T. degans Greg. 



\ L. about 0,oe mm T. pusilla Greg. 



I L. 0,00 mm T. Van Heurckii Grun. 



\ L. 0,09 to 0,2 mm 13. 



..jj 1 Ijongitudinal band, if present, not interrupted 13. 



"' I — — interrupted in the middle T. lata Cl. 



.„ I Longitudinal strite slightly finer than the transverse T. Kinkeriana Cl. 



1 — — much ' — — T. ritrea W. Sm. 



III. Amphoropsis Grun., median line excentric; keel.? of the valves tnrned in the same 

 direetions. 



., ) Keels without coarse ribs T. recta Greg. 



I — with — — T. concerta Lewis. 



1. T. antarctica GtRUN. (1878). — Frustule membranaceous, elliptical in outline. L. 0,i 9 to 0,24; 

 B. 0,06 to (),u8 mm. Central ai^ea small, stauriforni (the central nodule proljablj- being a little 

 transversely dilated). Transverse and longitndinal strise 21 (16 to 18 Brun) in O.m mm., the me- 

 dian transverse strite more distant than the others. — Ampliipr.? antarctica Gkux. in Cl. ~S[. D. 

 No. 125. Navicula Challcncjeri Grun. A. D. p. (i4 (1880). Stuvroncis glacialis Castrae. Yoy. Ciialleng. 

 D., p. 25. Pl. XXVII f. il, 188(5? Amphipr. fragiUs Temp. u. Brun. D. fossile.s du Japon. p. U. 

 Pl. IX f. 14 (1889). 



Marine, pelagic: Antarctic Ocean! Japan, fossil (Brtin.). 



2. T. inembranacea Cl. (1873). Frustule membranaceous, rectangular, very slightly con- 

 stricted, with rounded angles. L. 0,25 to O.s.--.; B. 0,o7 to 0.12.=. mm. Central area indistinct. 

 Transverse .strite 20 to 24, longitudinal 30 to 32 in 0,01 mm. — Amphiprora mrmJirnnacrn Cl. D. 

 of the Sea of Java p. 12, Pl. II, f. 18. 



Marine, pelagic: Java! Sumbava (Kinker Coll.)! Colon (Deby CoU.)! 



