32 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



0,01 mm. — Finn. fortis Greg. T. M. S. IV p. 47 Pl. V f. 19. N. fortis Donk. B. D. p. 57 Pl. VIII 

 f. 8. A. S. Atl. XLVI f. 37 to 39. Pinn. constricfa 0'Mbara M. J. VII p. 17 Pl. V f . 8 (1867). 

 Marine: Spitsbergen! Finmark! North Sea! Greenland! 



71. N. FornienterfB Cl. (1881). — V. elliptic-lanceolate obtnse. L. 0,o3 to 0,037; B. 0,oi3 

 to 0,01. 'i mm. Axial area indistinct. Central area large qnadrate. Strise (5 in 0, 01 mm., radiate 

 tliroughont, coarsely lineate; lineolse abont 24 in 0,oi mm. — N. Fromenierrp Cl. N. H. D. p. 10 

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



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



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

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

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



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



73. N. criicifera Grun. (1876). — V. broadlj^ linear, with apiculate ends. L. 0,o!i to 0,07; 

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

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

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

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

 N. a2nculata var. maculifera Grun. A. D. p. 37 (1880). J^. bicuspidata Cl. a. Grun. N. R. D. p. 10 

 Pl. II f. 25 (1881). 



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



This species is considered to be the same as JSf. apiculafa Bréb. Diat. de Cherbonrg 1859 f. 5 

 and Pinn. rostellata Greg. D. of Clyde Pl. IX f. 20 (1857), bnt these figures shew no central area. 



74. N. Scoliopleura A. S. (1876). — V. linear, with apiculate ends. L. 0,083; B. 0,oi67 

 mm. Median line slightly flexuose, with distant terminal nodnles. Axial area narrow, linear; 

 central area large, somewhat transverse. Striie 7 in 0, 01 mm., parallel throughout (finely lineate?) 

 — Atl. XLVI f. 63. 



Marine: Campeachy Bay (Atl.). 



75. N. solaris Greg. (1856). — V. lanceolate, obtuse. L. 0,03 s to 0,ii4 mm. Axial area 

 narrow; central area small, orbicular. Strite 14 in 0, 01 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. hottnica, but if it be N. hotfnica, the fig. is very far from accurate. In A. S. Atl. XLVI 

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

 the N. solaris of Greg. 



76. N. centraster Cl. N. Sp. — V. convex, linear lanceolate, obtuse. L. 0,o7 to 0, 11 ; 

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

 orbicular. Strise 7 to 8 in 0, 01 mm. strongly radiate in the middle, where tliey are more distant, 

 transverse at the ends, fiuely lineate; lineolfe 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 very finely lineate, stritu. 



77. N. pennata A. S. (1876). — V. linear-lanceolate, subaciite. L. 0,of,8 to 0,095; B. 0,oi 1 

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

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

 lineate; lineoltc 20 in 0,oi mm. — Atl. XLVIII f. 41, 42, 43. 



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

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



