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



KtJTZ Dec. N:o 72 according to Lagst. Pinmilaria 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. VIII f. 16 (17 forma curta). 

 Lagst. Ofvers. K. Sv. Vet.-Akad. Forh. 1884 X f. 5 «. N. crt/ptoc. v. rhynchoc. Strose Klieken 

 D. f. 3 b. 



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. XL VII f. 45, 46. 



Fresh water: Sweden, Loka (Atl.). 



Var. phyllepta KtJTZ. (1844). — L. U,o3 to 0,0.33; B. 0,oo8 to 0,oo9 mm. Striae 18 in 0,oi 

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



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



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

 N. arenaria Donk, M. J. I p. 10 PI. 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 PI. VIII f. 18. 



Marine: Baltic (Gothland)! North Sea! 



Var. Cymhula Donk. (1869). — V. lanceolate. L. 0,0.55; B. 0,oii mm. Axial area indistinct. 

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

 — N. Cymhula Donk. M. J. 1869 p. 294 PI. XVIII f. 6. V. H. Syn. PI. 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. Strife 22 in 0,oi mm. — N. eryptocephala 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. Jwrdeiformis Pant. (1889). — L. 0,026; B. 0,oo8 mm. Striae 10 to 12,5 in 0,oi mm. — 

 N. hordeiformis Pant. II p. 48 PL XI f. 197. 



Brackish water: Hungary, fossil (Pant.). 



29. N. aiiglica Ralfs (1861). — V. elliptical, with capitate ends. L. 0,o4; B. 0,oi4 mm. 

 Axial area very narrow. Central area small. Striat 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. Verb. 1860 p. 537 PL IV f. 43 a. N. aiu/lica 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. niinuta Cl. — L. 0,025; B. 0,u08 mm. Striae 15 to 17 in 0,oi mm. 



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



Var. sidjcruc'iata Grun. — L. 0,oi4 to 0,024; B. 0,ooi mm. Area more transverse. — Grun. 

 in V. H. Types N:o 99. 



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



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

 mm. Striae 9 to 11 in 0,oi mm. — N. tumida v. subsalsa Grun. Verb. 1860 p. 537 PL IV f. 43 b, c. 

 A. D. p. 34. N. angliea Donk. B. D. PL V f. 11 b. N. angliea v. subsaUna Grun. in V. H. Sj-n. 



p. 87 PL vni f. 31'. 



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



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



30. N. Grastrum 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 



