470 OLEVE, DIATOMS. 
forma curta Ol Length 0,03—0,04 mm. Breadth 0,009— 
0,01 mm. Strie 12 in 0,01 mm. — Davis strait, Cape Wankarema. 
Cape Deschnew (East Cape). — P1. 37, fig. 40. 
N. kariana Grun. passes over to N. transitans, which 
scarcely differs in anything but coarser strie and is by the 
latter connected with N. Zostereti and N. directa. According to 
Grunow the lineation of the strie of N. Kariana forms longi- 
tudinal fine lines, which may be explained by the approxima- 
tion of the strie. Nearly allied to N. Kariana seems to me 
to be the following species. 
N. subimpressa Grun. (A. Diat. pag. 39, P1. II, fig. 45) Kara. 
var.? temuior Cl. Length 00388 mm. Breadth 0,015 mm. 
Strize 18 in 0,01 mm. — P1. 37, fig. 49. — Cape Deschnew (East Cape). 
N. distans Sm. (Syn. I, pag. 56, Pl. XVIII, fig. 169) Greenl., 
(Davis strait) Spitsb., Finm. 
var. borealis Grun. (A. Diat. pag. 38, Pl. II, fig. 42) Spitsb., 
Finm. 
Sectio: Retuse. 
N. fortis Greg. (A. Schm. Atl. P1. XLVI, fig. 37—39) Greenl., 
Spitsb. 
N. opima Grun. (A. Schm. Atl. P1. XLVTI, fig. 25—26) Greenl., 
(Davis strait). 
N. jamalinensis Ol. (A. Diat. pag. 13, Pl. II, fig. 40) Jalmal, 
Cape Deschnew (East Cape). 
N. cancellata Donk. var. impressa Ldt. (N. impressa Ldt. 
Bib: t. K.: Sv. Vet. Ak. Handl. B. III; No 15, p2g. 33, 02. 3) 
Greenl. (Davis strait), Finm., Kara. 
var. Gregorii Grun. (A. Diat. pag. 37) Finm., Kara. 
var. subapiculata Grun. (1. c.) Kara. 
var. Schimidtii Grun. (1. ce.) 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 Bréb. 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.: Lundströmå Cl. (A. D. pag. 13, Pl. II, fig. 29) Kara. 
N: plicata Donk (BED PI IX; fig: 21y Kara. 
N. subinflata Grun. Mpt. — Linear oblong, more or less gib- 
bous in the middle, with rounded obtuse ends, very convex. 
Central strixe stronger and more distant, the others rather pa- 
