60 p. T. CLEVE, SYNOl^SIS OK THE NAVICULOID DIATOMS. 



Var. Icevis Cl. — L. 0,o7 to 0,n; B. 0,o5 to 0,o6 mm. Areas smooth. Marginal strife 10 

 to 13 and their puncta 11 to 16 in 0,oi mm. Axial striffi of 3 to 5 puncta. — N. Sandriana 



A. S. Atl. Ill f. 10; LXX f. 45. Pant. I p. 28 PL IX f. 82. 



Marine: North Sea (Bohuslan! Solswig, Atl.), S:t Brieuc (Atl.), Morocco! Balearic Islands! 

 Cannes! Red Sea (Deby Coll.)! Madagascar (Kinker Coll.)! Fossil, Hungary! 



22. N. spectabilis Greg. (1857). — V. elliptical. L. 0,o7 to 0,12; B. 0,o3 to 0,o6 mm. 

 Lateral areas broad, convergent, narrowed in the middle. Striae 6 to 14, puncta 10 to 23 in 0,oi 

 mm. - D. of Clyde p. 481 PL IX f. 10. A. S. Atl. Ill f. 20-21. Donk. B. D. p. 12 PI. II f. 5. 

 N. Hennedii Janisch Guano p. 28 PL II f. 13. N. mikado Pant. Ill PL XXIII f. 334 (1893)? 



Marine: Greenland! North Sea! Morocco! Mediterranean Sea! Adriatic! Red Sea! Bab el 

 Maiideb! Ceylon! Java! Philippines! Japan! Cape Horn (Petit), Colon (Deby Coll.)! Fossil: Au- 

 gamos Guano (Jan.), Hungary (Pant.), S:ta Monica, Calif.! 



N. spectabilis is extremely variable and comprises forms connecting N. Uennedyi and N. Lyra, 

 no absolute limit existing between these three species. 



Var. maxima Cl. — V. elliptical. L. 0,iii; B. 0,o8 mm. Areas linear. Strise 5 in 0,oi mm. 

 Puncta 7 in 0,oi mm. disposed in longitudinal rows. 



Marine: Macassar Straits (Grove Coll.)! 



Var. bullata Cl. — L. 0,ii; B. 0,o5 mm. Lateral areas with a row of large puncta. Striae 

 10, puncta 17 in 0,oi mm. — N. bullata var. obtusa Caste. Voy. Challenger p. 29 PL XXVIII f. 10. 



Marine: Singapore! 



Forma Molleriana Jan. (1881). — V. subhexagonal to elliptic-lanceolate. Lateral areas 

 narrow, scarcely narrowed in the middle. L. 0, i to 0,13; B. 0,o.5 to 0,o.^3 mm. Stria? 7, puncta 10 

 in 0,01 mm. — N. bullata var. Molleriana A. S. Atl. LXX f. 51, 52. 



Marine: Australia (Atl.). 



Var. madagascarensis Cl. — V. with subcuneate ends. L. 0,i25 to 0,155; B. 0,o62 to 0,o68 

 mm. Strise and puncta 13 in 0,oi mm.; the latter forming almost straight longitudinal rows. 



Marine: Madagascar (Van Heurck Coll.)! Nossi-Be (Tempere)! 



Var. controversa A. S. (1874). — L. 0,09; B. 0,035 mm. Lateral areas in the middle linear, 

 dilated and then narrowed towards the margins. Striae 10, puncta 13 in 0,oi mm. — N. Hennedyi 

 var. controversa A. S. Atl. Ill f. 5. 



Marine: Campeachy Bay (Atl.). 



Var. abbreviata Cl. — V. with slightly constricted middle and broad, cuneate ends. L. 0,083; 



B. 0,03 mm. Areas short not reaching to the ends of the valve. Striae 12 (axial and terminal 

 15), puncta 15 in 0,oi mm. 



Marine: Madagascar! 



Var. Rattrayi Pant. (1889). — V. elliptic-lanceolate. L. 0,0775; B. 0,o32 mm. Areas as in 

 var. abbreviata. Marginal striae 10, terminal 15 in O.ui mm. finely punctate. — N. Rattrayi 'Paj^it. 

 II p. 52 PL XXX f. 427. 



Marine: Hungary, fossil (Pant.). 



Var. emarginata Cl. — V. elliptical. L. 0,o7 to 0,n ; B. 0,03 to 0,042 mm. Areas broad, 

 notched in the middle. Striae 12, puncta 18 in 0,oi mm. Central nodule sometimes transversely 

 dilated. — N. excavata A. S. Atl. Ill f. 22—25. Janisch Gazelle Exp. XV f. 22. 



Marine: Sierra Leone (Deby Coll.)! Japan (Atl.), Campeachy Bay (Atl.), Nottingham, 

 Maryl. fossil (Rae Coll.)! 



Var. Angelorum Cl. a881). — V. elliptical. L. 0,o85 to 0,2; B. 0,04 7 to 0,o9 mm. Areas 

 broad sinuate in the middle, attenuate towards the ends, smooth. Striae 7 to 15, puncta 14 to 

 16 in 0,01 mm. Central nodule sometimes transversely dilated. — N. excavata var. Angdorum 

 Cl. N. R. D. p. 8 PL II f. 20. N. OsivaJdi Janisch, N. excavata var. mesoleia Grun. in A. S. Atl, 

 LXX f. 46 (1881). 



