466 CLEVE, DIATOMS. 
N. peregrina (Ehb.?) Kätz. (Van Heurck PI. VII, fig. 2, A. 
Schm. Atl. Pl. XLVII, fig. 57—60) Greenl., Mushroom Point, 
Kara, Cape Wankarema. 
var.? polaris Ldt. (Bih. t. K: Sv: Vet. Ak. Handl, I, No 14, 
pag. 26, Pl. II, fig. 3) Kara. 
N. valida Cl; at Grun. (A. Diat. pag. 32, PL IL fig. 29) 
Kara, Cape Wankarema. 
In the latter locality N. valida occurs in a great profusion 
of varieties, which are all asymmetrie, the strizx on one half of 
the valve being more approximate to the median line than on 
the other. The strize are always distinetly transversely lineate. 
One variety minuta Cl. has not alternately longer and shorter 
strie in the middle. Strix 8 in 0,01 mm. Length of the valve 0,023 
mm. Br. 0,013 mm. Typical specimens have the length 0,08 mm., 
the breadth 0,023 mm. and 8 strize, which in the middle are alter- 
nately longer and shorter. One variety is 0,11 mm. in length and 
0,026 mm. in breadth, has 8 strie in 0,01 mm., scarcely alter- 
nately longer and shorter in the middle, and is very asymme- 
tric. It comes near to N. distans var. borealis Grun, but has more 
dense strize. It approaches also fig. 17 and 18 in A. Schm. Atl. 
P1. XLVTI, which, however, are not distinetly asymmetrie. 
N. imperfecta Cl. — Broadly oval, 0,o065 mm. in length and 
0,08 mm. in breadth. Strix coarse, minutely transversely lineate, 
on one half of the valve more approximate to the med. line 
than on the other, shortened around the central nodule, 8 in 0,01 
mm., interrupted. — P1. 36, fig. 34. — Kara, Cape Wankarema. 
This form comes near to N. valida, but differs in its strize, 
which are much less distinetly transversely lineate and many 
times interrupted, so that they seem to be composed offragments. 
N. Placentula var. lanceolata Grun. (A. Diat. pag. 34) Kara. 
N. salinarwm Grun. (A. Diat. pag. 33, P1. II, fig. 34) Spitsb., 
Kara. 
N. rhynchocephala Kätz (Grun. A. Diat. pag. 33) Kara, Cape 
Deschnew (East Cape). 
N. bottnica Grun. (A. Diat. pag. 32, Pl II, fig. 32) Finm. 
Sectio: Directe. 
N. directa W. Sm. In the gatherings collected by Mr. Kjell- 
man on the ice of Cape Wankarema occurs an almost incred- 
ible profusion of varieties and forms, all connected with each 
other and more or less akin to N. directa. Many of these 
forms are very different to the outline, number of strig, 
which are entire or more or less interrupted, always distinetly 
transversely lineate. Many of these forms are distinctly asym- 
