472 CLBVE, DIATOMS. 



Sectio: Ellipticce. 



N. littoralis Donk. (A. Schm. Atl. PI. VIII, fig. 23—25) 

 Greenl. (Mushroom Point) Finm., Kara, Cape Deschnew (East 

 Cape). 



N. Smithii Br^b. (A. Schm. Atl. PI. VII, fig. 14—22) GreenL 

 (Mushroom Point) Finm., SpitSb., Kara (Matotscbkin, Jalmal), 

 Cape Deschnew (East Cape). 



N. fusca Greg. (A. Schm. Atl. PI. VII, fig. 1—4) Finm., 

 Matotschkin Schar. 



N. cestiva Donk. (A. Schm. Atl. VIII, fig. 26) Finm., Cape 

 Wankarema. 



N. siiborbicularis Greg. (A. Schm. Atl. PI. VIII, fig. 2—5) 

 Greenl. (Davis strait). 



N. JEudoxia A. Schm. (Atl. PI. VIII, fig. 40) Cape Wankarema. 



N. TschuUschorum CI. 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 striae, 13 in 0,oi mm. Length 

 0,01 mm. Br. 0,oo65. — PI. .37, fig. 48. — Cape Deschnew (East Cape). 



This species comes nearest to N. Eeichardii Grun. (Van 

 Heurck Syn. PI. X, fig. 9) which is larger and has closer, 

 punctate striae. The N. Mauleri R. J. Brun (Diat. des Alpes et 

 du Jura PI. I, fig. 18) is also an allied form, but more nearly 

 related to N. Borussica CI. (Schr. phys. oek. Ges. zu KOnigs- 

 berg Bd. XXII, pag. 139, A. Schm. Atl. PI. VIII, fig. 17) in 

 Domblitten deposit. . 



Sectio: hyrce. 



N. pygmcea Kiitz. (A. Schm. N. Sea Diat. PI. I, fig. 43) 

 Finm., Spitsb., Kara, Cape Deschnew (East Cape). 



N. ahrupta. Greg. (A. Schm. 1. c. PI. I, fig. 37) Finm., Spitsb. 



K hyalina Donk. (Brit. Diat. PI. I, fig. 1) Finm. 



N. forcipata Grev. (A. Schm. N. Sea Diat. PI. I, fig. 45, PI. 

 II, fig. 16 & 18) Greenl. (Davis strait). 



N. spectaUlis Greg. (Diat. of CI. pag. 481, PI. IX, fig. 10) 

 Greenl. 



N. circunisecta Grun. (A. Schm. Atl. PI. Ill, fig. 27—28) Finm. 



JV; Hennedyi Sm. (A. Schm. N. Sea Diat. PI. I, fig. 41) 

 Greenl., Finm., Spitsb., Kara (Matotschkin). 



N. Lyra Ehb. (A. Schm. Atl. PI. II, fig.. 16) Greenl., Finn]., 

 Spitsb., Kara (Matotschkin). 



var. elliptica A. Schm. (N. Sea Diat. PI. I, fig. 38—39) 

 Greenl. (Mushroom Point), Finm., Kara. 



