30 P. T. CLEVK, SYNOPSIS OF THE NAVICULUID DIATOMS. 



Var. intermedia GrRUN. (1882). — Strise in the middle 12 to 13, at the ends 15 in (),oi mm. 

 — iV". cancellata f. minuta Grun. A. D. p. 37 Pl. Il f. 41 (1880). N. amm. /'. minutu Grun. F. D. 

 Öst. Ung. p. 149 Pl. XXX f. 71 to 73. Pant. II p. 41 Pl. XI f. 190. 



Marine: Finmark (Grun.), North Sea (Grun.), Cape Deschneff! Hungary, fossil (Pant.). 



Var. degenerans Grun. (1882). — L. 0,ui4 to 0,02; B. 0,oo4 to O.ous mm. StriiE very finely 

 lineate, slightly radiate, 14 or 15 (middle) to 18 or 19 (ends) in 0,oi mm. — Foss. D. Öst. Ung. 

 p. 149 Pl. XXX f. 74, 75. 



Marine: Coasts of England (Grun.), Sweden! Hungary, fossil (Grun., Pant.). 



Var. flanatica Grun. (1860). — V. lanceolate with attenuate, acute ends. L. 0,u54; B. 0,oo8 

 mm. Striffi 9 to 11 in 0,oi mm. — N. flanatica Grun. Verh. 1860 p. 527 Pl. III f. 9. A", cancel- 

 lata v. scaldensis V. H. Syn. p. 86 Suppl. Pl. A f. 17. 



Marine: Belgium (V. H.), Adriatic (Grun.). 



63. N. Beckii Pant. (1889). — V. narrow, lanceolate with obtuse ends. L. O.03.5; B. 0,oo8 

 mm. Axial area distinct; central area small. Strite 12, .5 to 15 in 0, 01 mm. radiate in the middle, 

 transverse at the ends. — Pant. II p. 42 Pl. XI f. 188. 



Brackish water: Hungary, fossil (Pant.). 



According to Pantocsek this form seems to be akin to N. amniophila. 



64. N. cancellata Donk. (1873). — V. narrow, linear-lanceolate, convex, with subacute or 

 subcuneate ends. L. 0,o6 to 0,09; B. 0,012 mm. Axial area indistinct; central area small. Strite 

 5,.5 to 6,5, finely, but distinctly, lineate (lineolse about 18 in 0,oi mm.) slightly radiate in the 

 middle, transverse at the ends. — N. truncata Donk. M. J. I p. 9 Pl. I f . 4 (1861). N. cancellata 

 DoNK. B. D. p. 55 Pl. VIII f. 4 a, 6. — A. S. N. S. D. II f. 36, 37. Atl. XL VI f. 29, 30. V. H. 

 Syn. p. 86 Suppl. Pl. A f. 16. N. canc. v. genuina a. impressa Grun. A. D. p. 36. iV. fortis? 

 A. S. Atl. XL VI f. 36. iV. impressa Lägst. Bob. D. p. 33 f. 3. A. S. Atl. XL VI f. 31, 34. 



Marine: Finmark! Sea of Kära! Greenland! North Sea! Mediterranean Sea! Bab el Mandeb! 

 Madagascar! Labuan! China! Galapagos Islands! 



Var. maroccana Cl. — L. 0,095; B. 0,oi6 mm. Striee 5 in 0, 01 mm. coarsely lineate; lineohu 

 about 23 in 0,oi mm., crossed at the ends (below the margin) by a broad and short blank space. 



Marine: Morocco! 



The blank space at the ends of the valve is visible only in the zonal view. 



Var. Gregorii Halfs (1861). — V. lanceolate, subacute. L. 0,o3 to 0,05; B. 0,ou7 to 0,uu75. 

 Striaj 6,5 to 8 in 0,oi mm. — Pinnul apiculata Greg. M. J. III p. 41 Pl. IV f. 21 (1855)? N. 

 Gregorii Ralps Pritch Inf. p. 901. N. canc. v. Greg. Grun. A. D. p. 37. A. S. Atl. XLVI 

 f. 41, 42, 71, 72. 



Marine: Spitsbergen! Sea of Kära! North Sea (Atl.), Baltic (Atl.), Cape Deschneff! Sand- 

 wich Islands! New Caledonia! Tahiti! Kerguelen's Land! Galapagos Islands! 



Var. retiisa Bréb. (1854). — V. narrow, linear, with rounded or subcuneate ends. L. 0,o.') 

 to 0,075; B. 0,007 5 to 0,011 mm. Stria3 6 to 7 in 0,oi mm. - N. retusa Bréb. D. de Cherb. f. 6. 

 Donk. M. J. I (N. S.) p. 14 Pl. I f. 17 (1861) B. D. p. 64 Pl. X f. 3. A. S. N. S. D. Pl. Il f. 30. 

 Atl. XLVI f. 45, 46, 74, 75. N. cancellata v. Schmidtii Grun. A. D. p. 36. N. retusa v. subrvfusa 

 V. H. Syn. p. 77 Suppl. A f. 10 (V. H. T. N:o 74). 



Marine: Spitsbergen! North Sea! Baltic (Atl.), Cape Deschneff! 



N. retusa Grun. in A. D. p. 38 is another species, Pinnularia? amhigua Cl. N. retusa 

 V. H. Syn. seems to be another form, as the stria; are described as smooth. The figures of Bré- 

 bisson and Donkin are insufficient, so that it is doubtful, what the original iV. retusa may be. 



Var. subapiculata Grun. (1880). — V. linear, with apiculate ends. L. 0,o3 to O 04; B. O,ooti 

 to 0,008 mm. Strise 8 to 9 in 0,o 1 mm. — N. Gregorii A. S. N. S. D. II f. 22. A. S. Atl. XLVI 

 f. 66 to 68. N. cancell. v. .siibapic. Grun. A. D. p. 37. 



Marine: Sea of Kära! Baltic (Atl.), Firth of Tay (Atl.). 



