470 CLEVE, DIATOMS. 



forma curta CI. Length 0,o3 — 0,04 mm. Breadth 0,oo9 — 

 0,01 mm. Strise 12 in 0,oi mm. — Davis strait, Cape Wankarema. 

 Cape Deschnew (East Cape). — PI. 37, fig. 40. 



N. kariana Grun. passes over to N. transitans, which 

 scarcely differs in anything but coarser striae and is by the 

 latter connected with N. Zostereti and N. directa. According to 

 Grunow the lineation of the strise of N. Kariana forms longi- 

 tudinal fine lines, which may be explained by the approxima- 

 tion of the striae. Nearly allied to N. Kariana seems to me 

 to be the following species. 



N, subimpressa Grun. (A. Diat. pag. 39, PL II, fig. 45) Kara. 



var.? tenuior CI. Length 0,038 mm. Breadth 0,oi5 mm. 

 Striae 18inO,oi mm. — PL 37, fig. 49. — Cape Deschnew (East Cape). 



N. distans Sm. (Syn.I, pag. 56, PI. XVIII, fig. 169) Greenl, 

 (Davis strait) Spitsb., Finm. 



var. horealis Grun. (A. Diat. pag. 38, PI. II, fig. 42) Spitsb., 

 Finm. 



Sectio: Behisce. 



N. fortis Greg. (A. Schm. Atl. PI. XLVI, fig. 37—39) Greenl, 

 Spitsb. 



N. opima Grun. (A. Schm. Atl. PI. XLVI, fig. 25—26) Greenl, 

 (Davis strait). 



N. jamalinensis CI (A. Diat. pag. 13, PI II, fig. 40) Jalmal, 

 Cape Deschnew (East Cape). 



N. cancellata Donk. var. imjiressa Ldt. (N. impressa Ldt. 

 Bib. t. K. Sv. Vet. Ak. Handl B. Ill, No 15, pag. 33, fig. 3) 

 Greenl (Davis strait), Finm., Kara. 



var. Gregorii Grun. (A. Diat. pag. 37) Finm., Kara. 



var. subapiculata Grun. (1. c.) Kara. 



var. Schmidtii Grun. (1. c.) Spitsb., Cape Deschnew (East Cape). 



var. minuta Grun. (1. c.) Finm., Cape Deschnew (East Cape). 



N. inflexa Greg. (A. Schm. Atl. PL XLVI, fig. 69—70) Kara. 



N. retusa Breb. Cape Wankarema. 



I give a delineation of a specimen from Cape Wan- 

 karema, according to Grunow the typic N. retusa. It has 

 been drawn PL 36, fig. 35 a, b, from a dry specimen in two 

 different foci. 



Sectio: Decipientes. 



N. Lundstromii CI (A. D. pag. 13, PL II, fig. 29) Kara. 



N. plicata Donk. (B. D. PL IX, fig. 21) Kara. 



-ZV. suhinflata Grun. Mpt. — Linear oblong, more or less gib- 

 bous in the middle, with rounded obtuse ends, very convex. 

 Central strise stronger and more distant, the others rather pa- 



