466 OLEVB, DIATOMS. 



N. peregrina (Ehb. ?) Kiitz. (Van Heurck PI. VII, fig. 2, A. 

 Schm. Atl. PI. XL VII, fig. 57—60) Greenl., Mushroom Point, 

 Kara, Cape Wankarema. 



va.v.'f polaris Ldt. (Bih. t. K. Sv. Vet. Ak. Handl. I, No 14, 

 pag. 26, PI. II, fig. 3) Kara. . 



N. valida CI. afGrun. (A. Diat. pag. 32, PI. II, fig. 29) 

 Kara, Cape Wankarema. 



In the latter locality N. valida occurs in a great profusion 

 of varieties, which are all asymmetric, the striae on one half of 

 the valve being more approximate to the median line than on 

 the other. The striae are always distinctly transversely lineate. 

 One variety minuta CI. has not alternately longer and shorter 

 striae in the middle. Striae 8 in 0,oi mm. Length of the valve 0,o25 

 mm. Br. 0,oi3 mm. Typical specimens have the length 0,o8 mm., 

 the breadth 0,023 mm; and 8 striae, which in the middle are alter- 

 nately longer and shorter. One variety is 0,n mm. in length and 

 0,026 mm. in breadth, has 8 striae in 0,oi mm., scarcely alter- 

 nately longer and shorter in the middle, and is very asymme- 

 tric. It comes near to N. distans var. horealis Grun, but has more 

 dense striae. It approaches also fig. 17 and 18 in A. Schm. Atl. 

 PI. XL VI, which, however, are not distinctly asymmetric. 



N. imperfecta CI. — Broadly oval, 0,o65 mm. in length and 

 0,03 mm. in breadth. Striae 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,oi 

 mm., interrupted. — PI. 36, fig. 34. — Kara, Cape Wankarema. 



This form comes near to N. valida, but differs in its striae, 

 which are much less distinctly transversely lineate and many 

 times interrupted, so that they seem to be composed offragments. 



iV^. Flacentula var. lanceolata Grun. (A. Diat. pag. 34) Kara. 



iV. saUnarum Grun. (A. Diat. pag. 33, PI. II, fig. 34) Spitsb., 

 Kara. 



N. rhynehocephala Kiitz (Grun. A. Diat. pag. 33) Kara, Cape 

 Deschnew (East Cape). 



N. boitnica Grun. (A. Diat. pag. 32, PI. II, fig. 32) Finm. 



Sectio: Direcice. 



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 eacii 

 other and more or less akin to N. directa. Many of these 

 forms are very different to the outline, number of striae, 

 which are entire or more or less interrupted, always distinctly 

 transversely lineate. Many of these forms are distinctly asym- 



