472 CLEVE, DIATOMS. 
Sectio; Elliptice. 
N.s littoralis Donk. (A. Schm. Atl. Pl VIII, fig. 23—25y 
Greenl. (Mushroom Point) Finm., Kara, Cape Deschnew (East 
Cape). 
N. Smithir Bréb. (A. Schm. Atl. Pl. VII, fig. 14—22) Greenl. 
(Mushroom Point) Finm., Spitsb., Kara (Matotschkin, Jalmal), 
Cape Deschnew (East Cape). 
N. fusca Greg. (A. Schm. Atl. Pl: VIL fig. 1—4) Finn, 
Matotschkin Schar. 
N. estiva Donk. (A. Schm. Atl. VIII, fig. 26) Finm., Cape 
Wankarema. 
N. suborbicularis Greg. (A. Schm. Atl. Pl. VIII, fig. 2—5) 
Greenl. (Davis strait). 
N. Eudozxia A. Schm. (Atl. Pl. VIII, fig. 40) Cape Wankarema. 
N. Tschuktschorum Cl. N. Sp. — Small, oval with rounded 
ends. The middle of the valve has, as in N. Lyra-section, 
two arcuate, convergent thickenings, connected by a trans- 
verse bar at the centre. The space between the margin and 
the thickenings has coarse, costate strize, 13 in 0,01 mm. Length 
0,01 mm. Br. 0,0065. — P1. 37, fig. 48. — Cape Deschnew (East Cape). 
This species comes nearest to N. Reichardii Grun. (Van 
Heurck Syn. P1. X, fig. 9) which is larger and has closer, 
punctate strix. The N. Maderi R. J. Brun (Diat. des Alpes et 
du Jura P1. I, fig. 18) is also an allied form, but more nearly 
related to N. Borussica Cl. (Schr. phys. oek. Ges. zu Königs- 
berg Bd. XXII, pag. 139, A. Schm. Atl. Pl. VIII, fig. 17) in 
Domblitten deposit. 
Sectio: Lyre. 
N. pygmea Kätz. (A. Schm. N. Sea Diat. Pl. I, fig. 43) 
Finm., Spitsb., Kara, Cape Deschnew (East Cape). 
N. abrupta Greg. (A. Schm. 1. c. Pl. I, fig. 37) Finm., Spitsb. 
N. hyalina Donk. (Brit. Diat. P1. I, fig. 1) Finm. 
N. forceipata Grev. (A. Schm. N. Sea Diat. Pl. I, fig. 45, Pl. 
II, fig. 16 & 18) Greenl. (Davis strait). 
N. spectabilis Greg. (Diat. of Cl. pag. 481, Pl. IX, fig. 10) 
Greenl. 
N. circwmsecta Grun. (A. Schm. Atl. Pl. III, fig. 27—28) Finm. 
N. Hennedyi Sm. (A. Schm. N. Sea Diat. Pl. I, fig. 41) 
Greenl., Finm., Spitsb., Kara (Matotschkin). 
N. Lyra Ehb. (A. Schm. Atl. P1. II, fig. 16) Greenl., Finm., 
Spitsb., Kara (Matotschkin). S 
var. elliptica A. Schm. (N. Sea Diat. Pl I, fig. 38—39) 
Greenl. (Mushroom Point), Finm., Kara. 
