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



Kt)Tz Dec. N:o 72 according to Lagst. 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 PI. VHI f. 16 (17 forma curta). 

 Lagst. Ofvers. K. Sv. Vet.-Akad. Forh. 1884 X f. 5 a. N. cryptoc. v. rhynchoc. StrOse Klieken 

 D. f. 3 6. 



Fresla water: Sweden! Finland! Grermany! 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. XLVIl f. 45, 46. 



Fresh water: Sweden, Loka (Atl.). 



Var. phyllepta KtJTZ. (1844). — L. 0,o3 to 0,o33; B. 0,o08 to 0,oo9 mm. Striae 18 in 0,oi 

 mm. — N. phyllepta KtJTZ. Bac. p. 94 PL XXX f. 56. V. H. Syn. p. 88 PI. VHI f. 40. 



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



Var. arenaria Donk. (1861). — L. 0,05 to 0,06; B. 0,oi mm. Striae 9 to 10 in 0,oi mm. — 

 N. arenaria Done, M. J. I p. 10 PL I f. 9. B. D. p. 56 PL VIII f. 5. A. S. Atl. XL VII f. 38, 

 39, 40. N. lane. v. aren. V. H. Syn. p. 88 PL VIII f. 18. 



Marine: Baltic (Gothland)! North Sea! 



Var. Gymiula Donk. (1869). — V. lanceolate. L. 0,055; B. O,oii mm. Axial area indistinct. 

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

 — N. Gymbula 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. 0,026; B. 0,oi 

 mm. Striae 22 in 0,oi mm. — JSf. cryptocephala v. latior Dannf. Baltic D. p. 26 PL II f. 12. 



Brackish water: Baltic (Helsingfors, Gothland) Dannf. 



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

 under N. lanceolata. 



Var. hordeiformis Pant. (1889). — L. 0,026; B. 0,oo8 mm. Striae 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. anglica Ralfs (1861). — V. elliptical, with capitate ends. L. 0,04; B. 0,oi4 mm. 

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

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

 (1853). JSf. tumida genuina Gkun. 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. anglica Grun. A. D. p. 34. 



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



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



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



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

 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. on 

 mm. Striae 9 to 11 in 0,oi mm. — N. tumida v. subsalsa 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. subsalina Grun. in V. H. Syn 

 p. 87 PL Vin f. 31. 



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



The var. subsalsa is nearly akin to JSf. dicephala and connects this species with N. Gastrum. 



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

 ends. L. 0,024 to 0,045; B. 0,012 to 0,oi8 mm. Axial area very narrow. Central area large 

 irregular, somewhat transverse. Striae 8 to 10 in 0,oi mm., finely punctate, in the middle usually 



