110 p. T. CLEVE, SYXOPSIS OF THE NAVICULOII) DIATOMS. 



Yar. (lanuica Grun. Ms. — Smaller, with somewliat obtuse ends. \i. 0,(17 to 0,i)'.); H. 0,017 

 to 0,02 mm. Transverse strife 16 to 17, longitudinal 21 to 27 in 0,iii mm. 



Fresh water: (ireenland! Danas pond, Massachusetts (Clrun.). 



Var. ainhigna EiiB. (1843). — Lanceolate, rostrate. Strife finer. — Xar. (inih. Ehh. Am. II: 2, 

 f. 9? KuTZ. Bac. p. 95 PI. XXVIII f. 6G. W. Sm. B. D. I Pl. XVI f. U9. Donk. B. D. p. 39 

 PL VI f. 5. Pedicino Ischia D. PI. II f. 4, 6. V. H. Syn. p. 100 PI. XII f. 5. N. spha-rophora 

 Donk. B. D. PI. V f. 10? N. hirostrata Greu. M. J. Ill p. 40 PI. IV f. 15 (1S55). N. qiianicrenais 

 Grun. Verh. 1860 p. 530 PL III f. 8? VanheurcJcia amb. Bri5b. Ann. Soc. phyto. et micro, de 

 Belgique I p. 206 (1868). 



Fresh water: Sweden! Belgium (V. H.), Italy (Pedic), Japan! New Zealand! Argentina! 



Var. Heribaudi Perag. (1893). — Median strife somewhat radiate and more distant than in 

 the type. — Herib. D. d'Aiivergne p. 108 PL IV f. 16. 



Fresh water: Auvergne, fossil. 



As Bacillaria fulra Nitzscu is an older name than V. cusp'Khda, it would have been more 

 correct to name this species N. fulva, but on the other hand it is so extremely difficult to make 

 out what the names of the older authors denote, and the name N. cnspidata has been so commonly 

 adopted, that to do so would make the synonymy still more intricate. I prefer therefore the 

 generally accepted name. N. cuspidata is variable as to the outline, and it can hardly by doubted 

 that N. cHspidata and N. ambigna should be united into one species. It fre(j[uently occurs in the 

 forms of N. cuspidatn that the interior of the valve is provided with strong transverse costfe. 

 Such monstrosities have been named SurireUa craticula Ehr., Crafici'la Ehrenbngii Grun., Sticto- 

 desmis craficida L. Sm. Sticfodesmis Fchigerii (Deby Coll. == craticular state of the var. danaica). 

 Their true nature has been shewn by Pfitzer (Ban u. Entw. p. 104). See also Heribaud D. de 

 d' Auvergne p. 107 PL IV f. 15. 



7. N. Perrotettii Grun. (1867). — V. rhombic-lanceolate, with slightlj^ rostrate ends. L. 

 0,12 to 0,185; B. 0,03 to 0,04 mm. Transverse stria^ 13 to 14, longitudinal strife 11 to 12 in 0,oi 

 mm. — Craticula Fcrrotcttii Grun. Nov. p. 20 PL I f. 21. Nav. Perrotettii Grun. M. J. 1877 

 p. 172. — Icon. n. PL III f. 12. Nav. Pangeroni Leud. Forth. D. de la Malaisie p. 52 PL II f. 9. 



Slightly brackish water: Italy (Grun.), Philippines (Dr. Eae Coll.)! Java (Lend-. Fortm.), 

 New Guinea (Tempere)! Senegal (Grun.)! Rio Piirus, Brazil (Deby Coll.)! Lake Pistaku, Illinois 

 (Grove Coll.)! 



8. N. Stodderi Greenl. (1861). — V. lanceolate with acute ends. L. 0,oy; B. 0,01 4 mm. 

 Central nodule dilated to a stauros, reaching the margin; terminal nodules small; terminal fissures 

 nearly straight. Transverse strise 18 to 19 (22 according to Lewis) in 0,oi mm. longitudinal about 

 13 in 0,0 1 mm. — Stauroncis Stodderi Greenl. in Lewis Proc. Ac. Philad. 1861 PL II f. 6. 



Fresh water: French pond, Maine! Waltham, Mass.! 



Var. insignis Grun. Ms. — V. rhombic-lanceolate. L. 0,09; B. 0,021 mm. Transverse strife 

 16 in 0,01 mm.; longitudinal 7 to 8 in 0,oi mm. — Stauron. lineolata Ehh. Am. II: 1 f. 19? 

 N. Stodd. V. ins. PL III f. 13. 



Slightly brackish water: Bengal! 







9. N. sulcata Cl. (1881). — V. linear, with subacute ends. L. 0,088 to O,io'j; B. 0,oo8 to 

 0,0 9 mm. Central nodule transversely dilated to a stauros reaching the margin. Transverse strise 

 21, longitudinal 13 to 14 in 0,oi mm. — Stauron. sulcata Cl. N. R. D. p. 14 PL III f. 46. 



Marine: Balearic Islands! 



10. N. Spicula HiCKiE (1873). — V. narrow lanceolate, with subacute ends. L. 0,o5 to 0,1.3; 

 B. 0,004 to 0,013 mm. Central nodule dilated into a stauros, reaching the margin. Transver,se 

 strife 25 to 29, longitudinal finer. Frustules free. — Stauroneis Spicula Hickie Month. M. Journ. 



