110 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. danaica Grun. Ms. — Smaller, with somewiat obthse ends. L. 0,07 to 0,09; B. 0,oi7 

 to 0,02 mm. Transverse strise 16 to 17, longitudinal 21 to 27 in 0,oi mm. 



Fresh water: Greenland! Danas pond, Massachusetts (Grun.). 



Var. ambigua Ehb. (1843). — Lanceolate, rostrate. Striffi finer. — Nav. amb. Ehb. Am. II: 2, 

 f. 9? KuTZ. Bac. p. 95 PI. XXVIII f. 66. W. Sm. B. D. I PI. XVI f. 149. Donk. B. D. p. 39 

 PI. VI f. 5. Pedicino Ischia D. PI. II f. 4, 6. V. H. Syn. p. 100 PI. XII f. 5. JV. spkcBrophora 

 DoNK. B. D. PL V f. 10? N. birostrata Greg. M. J. Ill p. 40 PI. IV f. 15 (1855). N. quarnerensis 

 Grun. Verh. 1860 p. 530 PL III f. 8? VanheurcMfz amb. Br^b. Ann, Sop. phyto. gt micro, de 

 Belgique I p. 206 (1868). 



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



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

 the type. — H6rib. D. d'Auvergne p. 108 PL IV f. 16. 



Fresh water: Auvergne, fossil. 



As Bacillaria fulva Nitzsch is an older name than N. cuspidata, it would have been more 

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

 out what the names of the older authors denote, and the name N. cuspidata 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. cuspidata and N. ambigna should be united into one species. It frequently occurs in the 

 forms of iV. cuspidata that the interior of the Valve is provided with strong transverse costae. 

 Such monstrosities have been named Surireila craticula Ehr., Graticitla Ehrenbergii Grun., Sticto- 

 desmis craticula L. Sm. Stictodesmis Febigerii (Deby Coll. = craticular state of the var. danaica). 

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

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



7. N. Perrotettli Grun. (1867). — V. rhombic-lanceolate, with slightly rostrate ends. L. 

 0,12 to 0,185; B. 0,03 to 0,04 mm. Transverse strise 13 to 14, longitudinal striae 11 to 12 in 0,oi 

 mm. — Craticula Perrotettii 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. Fortm. D. de la Malaisie p. 52 PL II f. 9. 



Slightly brackish water: Italy (Grun.), Philippines (Dr. E,ae Coll.)! Java (Leud. Fortm.), 

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

 (Grove ColL)! 



8. N. Stodderi Grbenl. (1861). — V. lanceolate with acute ends. L. 0,o9; B. 0,oi4 mm. 

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

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

 13 in 0,01 mm. — Stauroneis 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 strise 



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 0,io9; B. 0,oo8 to 

 0,00 9 mm. Central nodule transversely dilated to a stauros reaching the margin. Transverse striae 

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



Marine: Balearic Islands! 



10. N. Spicula HiCKiB (1873). — V. narrow lanceolate, with subacute ends. L. 0,o5 toO.is; 

 B. 0,004 to 0,013 mm. Central nodule dilated into a stauros, reachirig the margin. Transverse 

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



