110 P. T. CLEVE, SYNOPSIS OF THE NAVICULOIIJ DIATOMS. 



Var. danaicu Grun. Ms. — Smaller, -vvitli somewliat obtuse euds. L. 0,o7 to 0,09; B. 0,i)it 

 to 0,02 mm. Transverse stritc Iti to 17, longitudinal 21 to 27 in 0, 01 mm. 



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



Var. ambigua Ehb. (1843). — Lanceolate, rostrate. Strise finer. — Nac. amh. Ehb. Am. II: 2, 

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

 Pl. VI f. 5. Pedicino IscMa D. Pl. II f. 4, 6. V. H. Syn. p. 100 Pl. XII f. 5. N. sphceropJiora 

 Donk. B. D. Pl. V f. 10? N. Urostrata Greg. M. J. III p. 40 Pl. IV f. 15 (1855). N. quarnercnsis 

 Grun. Verh. 1860 p. 530 Pl. III f. 8? VanheurcMa amh. Bréb. Ann. Soc. phyto. et micro. de 

 Belgique I p. 206 (1868). 



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



Var. Hérihauäi Perag. (1893). — Median strise somewliat radiate and more di.stant than in 

 the type. — Hérib. 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 wonld Iiave been more 

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

 ont what the names of the older authors denote, and the name N. cuspiäaia 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 doiibted 

 that N. cuspidata and N. amhigna should be united into one species. It frequentlj' occurs in the 

 forms of N. cuspidata that the interiör of the valve is provided with strong transverse costie. 

 Such monstrosities have been named Surirella craticnla Ehr., Craticula Ehrenliergii Grun., Sticto- 

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

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

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



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

 0,12 to 0,185; B. 0,03 to 0,04 mm. Transverse stritB 13 to 14, longitudinal strite 11 to 12 in 0,01 

 mm. — Craticula Ferrotettii 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. Eae Coll.)! Java (Leud. Fortm.), 

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

 (Grove Coll.)! 



8. N. Stodderi Greenl. (1861). — V. lanceolate with aeute ends. L. O.oo; B. 0,oi4 mm. 

 Central nodnle dilated to a stauros, reaching the margin; terminal nodules small; terminal lissures 

 nearly straight. Transverse strite 18 to 19 (22 according to Lewis) in 0, 01 mm. longitudinal abont 

 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 stria^ 

 16 in 0,01 mm.; longitudinal 7 to 8 in 0,oi niin. — Stauro)i. Uneolata Ehh. Am. II: 1 f. 19? 

 N Stödd. v. ins. Pl. III f. 13. 



Slightly brackish water: Bengal! 



9. N. Siilcatii Cl. (1881). — V. linear, with subacute ends. L. O, oss to 0,io<.); B. O.oos to 

 0,0 0'.) mm. Central nodnle transversely dilated to a stauros reaching the margin. Transverse strise 

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



Marine: Balearic Islands! 



10. N. Spicula H1CKIE (1873). — V. narrow lanceolate, with subacute ends. L. O.os toO.13; 

 B. 0,004 to O, O!. i mm. Central nodule dilated into a stauros, reaching the margin. Transverse 

 strice 25 to 29, longitudinal finer. Frustules free. — Stauroneis Spicula Hickie Montli. M. Jouru. 



