30 p. T. CLEVK, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. intermedia (tRUN. (1882). — Strife in the middle 12 to 13, at the ends 15 in 0,ui mm. 

 — ^Y. cancellata f. iiiiuuta Grun. A. D. p. 37 PI. II f. 41 (1880). N. cimni. f. minuta Grun. F. D. 

 Ost. 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,oi4 to 0,02; B. 0,oo4 to 0,00.5 mm. Striae very finely 

 lineate, slightly radiate, 14 or 15 (middle) to 18 or 19 (ends) in 0,oi mm. — Foss. D. Ost. 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. 0,054; B. 0,oo8 

 mm. Strise 9 to 11 in 0,oi mm. — N. flanatica Grun. Verh. 1860 p. 527 PL III f. 9. N. 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. Strige 12, .5 to 15 in 0,oi 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. ammophila. 



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

 subcuneate ends. L. 0,o6 to 0,09; B. 0,oi2 mm. Axial area indistinct; central area small. Striae 

 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. XLVI f. 29, 30. V. H. 

 Syn. p. 86 Suppl. PL A f. 16. N. cane. v. genuina a. impressa Grun. A. D. p. 36. N. fortis? 

 A. S. Atl. XLVI f. 36. N. impressa Lagst. Boh. D. p. 33 f. 3. A. S. Atl. XLVI f. 31, 34. 



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

 Madagascar! Labuan! China! Galapagos Islands! 



Var. maroccana Cl. — L. 0,095; B. 0,oi6 mm. Strise 5inO,oi mm. coarsely lineate; lineola; 

 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 Ralfs (1861). — V. lanceolate, subacute. L. 0,03 to 0,05; B. 0,oo7 to 0,oo7 5. 

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

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

 f. 41, 42, 71, 72. 



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

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



Var. retusa Br^b. (1854). — V. narrow, linear, with rounded or subcuneate ends. L. 0,o5 

 to 0,075; B. 0,0075 to 0,011 mm. Striae 6 to 7 in 0,oi mm. — N. retusa Br]5b. 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^ I). PL II f. 30. 

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

 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? ambigua Cl. ' J^.'retusa 

 V. H. Syn. seems to be another form, as the striae are described as smooth. The figures of Br^- 

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



Var. subapiculata Grun. (1880). — V. linear, with apiculate ends. ' L. 0,o3 toOo4; B. 0,oq6 

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

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



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



