22 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



KtJTZ Dec. N:o 72 according to Lägst. Pinnularia viridula W. Sm. B. D. XVIII f. 175. N. lanceol. 

 A. S. Atl. XL VII f. 49. Grun. A. D. p. 35. V. H. Syn. p. 88 Pl. VHI f. 16 (17 forma curta). 

 Lägst. Öfvers. K. Sv. Vet.-Akad. Förh. 1884 X f. 5 a. N. cryptoc. v. rhyncJioc. Ströse Klieken 

 D. f. 3 h. 



Fresh water: Sweden! Finland! Germany! England! Belgium (V. H.), Japan! Australia, 

 Mitchell River! 



Var. tenella A. S. (1876). — V. narrow lanceolate. L, 0,o35; B. 0,oo6 mm. — N. tenella A. S. 

 Atl. XLVII f. 45, 46. 



Fresh water: Sweden, Loka (Atl.). 



Var. pliyllepta KuTZ. (1844). — L. 0,o3 to 0,033; B. 0,uo8 to 0,oo9 mm. Strise 18 in 0,oi 

 mm. — N. phyllepta Kutz. Bac. p. 94 Pl. XXX f. 56. V. H. Syn. p. 88 Pl. VHI f. 40. 



Brackish water: Belgium (V. H.), Saxony (Saline Durrenberg)! 



Var. arenaria Donk. (1861). — L. 0,05 to 0,o6; B. 0,oi mm. Strise 9 to 10 in 0,oi mm. — 

 N. arenaria Donk, M. J. I p. 10 Pl. I f. 9. B. D. p. 56 Pl. VIII f. 5. A. S. Atl. XLVII f. 38, 

 39, 40. N. lanc. v. aren. V. H. Syn. p. 88 Pl. VIII f. 18. 



Marine: Baltic (Gothland)! North Sea! 



Var. Cymbula Donk. (1869). — V. lanceolate. L. OjO.-is; B. 0,oii mm. Axial area indistinct. 

 Central area small, orbicular. Strise 8 (middle) to 10 (ends) radiate thronghout, coarsely lineate. 

 — N. Cijmbula Donk. M. J. 1869 p. 294 Pl. XVIII f. 6. V. H. Syn. Pl. VII f. 32. 



Fresh water: England (Donk.), Finland! Japan! 



Var.? latior Dannf. (1882). — V. broadly lanceolate, with capitate ends. L. 0,o26; B. 0,oi 

 mm. Strise 22 in 0,oi mm. — N. cryptocephala v. latior Dannf. Baltic D. p. 26 Pl. II f. 12. 



Brackish water: Baltic (Helsingfors, Gothland) Dannf. 



As Dannfeldts fig. shews the strise radiate at the ends, this form has been classed here 

 under N. lanceolata. 



Var. hordeiformis Pant. (1889). — L. 0,o26; B. 0,oo8 mm. Strise 10 to 12,5 in 0,oi mm. — 

 N. hordeiformis Pant. H p. 48 Pl. XI f. 197. 



Brackish water: Hungary, fossil (Pant.). 



29. N. aiiglica Ralfs (1861). — V. elliptical, with capitate ends. L. 0,04; B. 0,oi4 mm. 

 Axial area very narrow. Central area small. Strise 9 to 12 in 0,oi mm. radiate throughout, 

 finely lineate, in the middle of equal length. — N. tumida W. Sm. B. D. I p. 53 Pl. XVII f. 146 

 (1853). N. tumida genuina Grun. Verh. 1860 p. 537 Pl. IV f. 43 a. N. anglica Ralfs in Pritch. 

 Inf. p. 900. Donk. B. D. p. 35 Pl. V f. 11 a. V. H. Syn. p. 87 Pl. VIII f. 29, 30. N. gastrum 

 v. angliea Grun. A. D. p. 34. 



Fresh water: Sweden! Finland! England! Illinois! Ecuador! 



Var. minuta Cl. — L. 0,025; B. 0,oo8 mm. Strise 15 to 17 in 0,oi mm. 



Fresh water: Finland, Lake Lojo near Åbo! Jamaica! 



Var. subcruciata Grun. — L. 0,oi4 to 0,024; B. 0,oo7 mm. Area more transverse. — Gbun. 

 in V. H. Types N:o 99. 



Slightly brackish water: England (V. H. T.). 



Var. suhsalsa Grun. 1860. — V. lanceolate with rostrate, not capitate ends. L. 0,03; B. 0,oi 1 

 mm. Strise 9 to 11 in 0,oi mm. — N. tumida v. suhsalsa Grun. Verh. 1860 p. 537 Pl. IV f. 43 b, c. 

 A. D. p. 34. N. anglica Donk. B. D. Pl. V f 11 b. N. anglica v. suhsalina Grun. in V. H. Syn. 

 p. 87 Pl. Vni f. 31. 



Slightly brackish water: Neu.siedler See (Grun.), Shienitzer See, Prussia (Grun.). 



The var. subsalsa is nearly akin to N. dice2)hala and connects this species with N. Gastrum. 



30. N. Gästrum Ehb. (1843). — V. lanceolate to elliptical, with slightly rcstrate, obtuse 

 ends. L. 0,024 to 0, 04. -i; B. 0,012 to 0,oi8 mm. Axial area very narrow. Central area large 

 irregular, somewhat transverse. Strise 8 to 10 in 0,oi mm., fi)iely punctate, in the middle usually 



