30 P, T. CLEVK, SYNOPSIS OF THE NAVICULUlI) IJIATOMS. - 



Var. intcrnudid. (tKUN. (18<S2). — StricU in the middle 12 to lo, at tlie ends 1.") in 0.( i mm. 

 — X. canccllata f. mimda Grun. A. D. p. 37 I'l. II f. 41 (1880). X. uihiii. f. niiimla Ghun. ¥. D. 

 Ost. Ung. p. 149 PI. XXX f. 71 to 73. Pant. U p. 41 PI. Xi f. 1!)(». 



Marine: Finmark (Grun.), North Sea (Grun.), Cape Deschnett'I Hungary, t'o.s.sil (Pant.). 



Var. degencrans Grun. (1882). — L. 0,oi4 to 0,o-j; B, (),i)04 to O.iki.'j mm. Stria-, very finely 

 lineate, slightly radiate, 14 or 15 (middle) to 18 or ID (ends) in <i,(ii mm. -- Foss. I). Ost. Ung. 

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



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



Var. flanafica Grun. (18(50). - V. lanceolate with attennate, acute ends. L. 0,054; B. 0,oo8 

 mm. StricB 9 to 11 in 0,oi mm. - V. flanafica Grun. Verh. 18(iO p. 527 PI. Ill f. 9. N. cancel- 

 lata V. scaldensis V. H. Syn. p. 8(5 Suppl. PI. A f. 17. 



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



63. N. Beckii Pant. (1889). — V. narrow, lanceolate with obtuse ends. L. 0.035; B. 0,oos 

 mm. Axial area distinct; central area small. StriiP 12, .'i 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 A. (inniiopk'du. 



(54. 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. Striie 

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

 middle, transverse at the ends. — N. truncata I)onk. M. J. I p. 9 PI. I f . 4 (1861). X. canccllafu 

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

 Syn. p. 86 Suppl. PI. A f. 16. X. cane. v. yenuina a. impressa Grun. A. D. p. 36. X. forfis'^ 

 A. S. Atl. XL VI f. 36. X. impressa Lagst. Boh. D. p. 33 f 3. A. S. Atl. XL VI 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,o!b mm. Striae 5in0,oi mm. coarsely lineate; lineohe 

 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,o3 to 0,05; B. 0,007 to 0,0075. 

 Striffi 6,5 to 8 in 0,oi mm. — Finnul. apiculata (tREG. M. J. Ill p. 41 PI. IV f. 21 (1855)? X. 

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

 f. 41, 42, 71, 72. 



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

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



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

 to 0,075; B. 0,007 5 to 0,011 mm. Stria^ (5 to 7 in 0,01 mm. - X. retusa Bri^b. D. de Cherb. f 6. 

 Donk. M. J. I (N. S.) p. 14 PI. If. 17 (1861) B. D. p. (54 PI. X f. 3. A. S. N. S. D. PI. II f. 30. 

 Atl. XLVI f. 45, 46, 74, 75. X. caiieellata r. Schmidtii Grun. A. D. p. 36. X. retusa r. subrefusa 

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



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



X. retusa Grun. in A. D. p. 38 is another species, Pinnularia? umljigaa Cl. X. retusa 

 V. H. Syn. seems to be another form, as the strict are described as smooth. The figures of Bre- 

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



Var. sul)apiculata Grun. (1880). — V. linear, with apiculate ends. L. 0,o3 to0o4; B. 0,oo6 

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

 f. 66 to 6i^. X. caneell. r. subapie. Grun. A. D. p. 37. 



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



