32 p. T. OLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



0,0) mm. — Finn, fortis Greg. T. M. S. IV p. 47 PI. V f. 19. N. fortis Donk. B. D. p. 57 PL VIII 

 f. 8. A. S. Atl. XLVI f. 37 to 39. Finn, constricta O'Mbara M. J. VII p. 17 PI. V f . 8 (1867). 

 Marine: Spitsbergen! Finmark! North Sea! Greenland! 



71. N. Foriuenterae Cl. (1881). — V. elliptic-lanceolate obtuse. L. 0,o3 to 0,037; B. 0,o)3 

 to 0,0 1.". mm. Axial area indistinct. Central area large quadrate. Striae 6 in 0,oi mm., radiate 

 throughout, coarsely lineate; lineoliB about 24 in 0,oi mm. — N. FromenterfP Cii. N. R. D. p. 10 

 PI. II f. 24. Icon. n. PI. I f. 33. A. S. Atl. XLVI f. 7 (without name). 



Marine: Balearic Islands! Campeachy Bay (Atl.). 



72. N. satnra A. S. (1876). — V. narrow elliptical, with rounded ends. L. 0,075; B. 0,021 

 mm. Axial area indistinct; central area large. Terminal nodules very distant from the ends. 

 Striae 5,5 in 0,oi mm. parallel, coarsely punctate.. — Atl. XLVI f. 27. 



Marine: Cape of Good Hope (Atl.), Cape Horn (Petit). 



73. N. crucifera Grun. (1876). — V. broadly linear, with apiculate ends. L. 0,o5 to 0,07; 

 B. 0,017 to 0,019 mm. Axial area very narrow; central area large, quadrate. Striae 5 to 6 in 

 0,01 mm., slightly radiate throughout, coarsely lineate; lineolee 22 in 0,oi mm. In the zonal view 

 the frustule is quadrate and has irregularly triangular terminal areas or blank spaces. — N. ro- 

 stellata A. S. N. S. D. PI. II f. 31 (1874). N. crucifera Grun. A. S. Atl. XLVI f. 50—53 (1876). 

 N. apiculata var. maculifera Grun. A. D. p. 37 (1880). iV^, hicuspidata Cl. a. Grun. N. R. D. p. 10 

 PI. II f. 25 (1881). 



Marine: North Sea! Baltic (Atl.), Naples! Sumatra (Deby Coll.)! 



This species is considered to be the same as N. apiculata Br^b. Diat. de Cherbourg 1859 f. 5 

 and Finn, rostellata Greg. D. of Clyde PL IX f. 20 (1857), but these figures shew no central area. 



74. N. Scoliopleura A. S. (1876). — V. linear, with apiculate ends. L. 0,o83; B. 0,oi67 

 ram. Median line slightly flexuose, with distant terminal nodules. Axial area narrow, linear; 

 central area large, somewhat transverse. Striae 7 in 0,oi mm., parallel throughout (finely lineate?) 

 — Atl. XLVI f. 63. 



Marine: Campeachy Bay (Atl.). 



75. N. Solaris Greg. (1856). — V. lanceolate, obtuse. L. 0,o3 8 to 0,114 mm. Axial area 

 narrow; central area small, orbicular. Striae 14 in 0,oi mm., strongly radiate throughout. — 

 T. M. S. IV p. 43 PL V f. 10. 



Marine: Scotland (Greg.). 



This form is entirely unknown to me. To judge from the figure it has some resemblance 

 to N. bottnica, but if it be N. bottnica, the fig. is very far from accurate. In A. S. Atl. XLVI 

 f. 16 is a form from New Providence named N. Solaris? but the striation is much too coarse for 

 the N. Solaris of Greg. 



76. N. eentraster Cl. N. Sp. — V. convex, linear lanceolate, obtuse. L. 0,o7 to 0,ii ; 

 B. 0,012 to 0,015 mm. Axial area indistinct, or narrow and unilateral. Central area large, 

 orbicular. Striae 7 to 8 in 0,oi mm. strongly radiate in the middle, where they are more distant, 

 transverse at the ends, finely lineate; lineolse about 30 in 0,oi mm. — PL I f. 35. 



Marine: Japan! Madagascar! Auckland! 



This species resembles N. inflexa Greg, but has more distant, and veiy finely lineate, striae. 



77. N. pennata A. S. (1876). — V. linear-lanceolate, subacute. L. 0,o68 to 0,095; B. 0,oi 1 

 to 0,014 mm. Terminal fissures small, close to the ends of the valve. Axial area narrow or 

 indistinct; central area large, quadrate. Striae 5 to 6 in 0,oi mm., radiate throughout, coarsely 

 lineate; lineolae 20 in 0,oi mm. — Atl. XL VIII f. 41, 42, 43. 



Marine: Morocco! Mediterranean Sea! Adriatic (Atl.), Hungary, fossil! Gulf of Mexico 

 (Atl.), West Indies! Pensacola, Florida! 



