464 



CLEVE, DIAT03IS. 



var. minor Grun. (A. Diat. pag. 28, PI. I, fig. 12) Finm. 



N. cruciformis Donk. (Brit. Diat. PI. X, fig. 4) Finm. 



var. hrevior CI. — Length 0,o35 mm. Br. 0,oo9 mm. Str. 14 

 in 0,01 mm. Cape Deschnew (East Cape). — PL 35, fig. 18. 



* Theelii CI. (A. Diat. pag. 13, PI. I, fig. 22) Kara, Cape 

 Deschnew (East Cape). Specimens from Cape Deschnew (East 

 Cape) have the length 0,o5 mm. and the br. 0,oi8 mm. Strise 

 12 in 0,01 mm. In the Cape Deschnew (East Cape) material 

 occur some specimens, which seem to connect N, Theelii 

 with N. Pinniilaria. 



N. decurrens (Ehb.) Grun. In the Cape Deschnew (East Cape) 

 gathering occurs a Navicula, which Grunow refers to N. decur- 

 rens. It has about 11 costate and radiant striae in 0,oi mm., 

 which do not reach the median line. Length 0,o6 mm. Breadth 

 0,013 mm. The valve is linear with gibbous middle and rounded 

 obtuse ends. Median line is slightly undulating. In some 

 specimens the strias are absent in the middle of the valve, in 

 w^iich case the form seems to be closely allied with Nav. cru- 

 ciformis although the latter has the striae reaching to the me- 

 dian line. On the other side it seems also akin to Nav. bica- 

 pitata Ldt. — PI. 36, fig. 20. 



N. gJohiceps var. crassior Grun. (A. Diat. pag. 27, PL I, fig. 

 13) Kara (fresh- water species?). 



N. megastanros CI. — Small, elliptic, probably depressed in 

 the middle. Striae costate, oblique, reaching the median line, 

 except in the middle, where they are very short or marginal, 

 so that the central, nodule is surrounded by a large stauros. 

 Striae 16 in 0,oi mm. Length 0,02 mm. Breadth 0,oo8 mm. 

 Cape Deschnew (East Cape). — PL 36, fig. 19. 



Sectio: Limosce. 



N. venfricosa (Ehb.?) Donk var. subiindtdata Grun. (A. Diat. 

 pag. 29, PL I, fig. 16) Kara. 



var. Kjelhnaniana CI. (A. Diat. pag. 29, PL I, fig. 17) Finm. 



N. sid)ventricosa. Grun. (A. Diat. pag. 29, PL I, fig. 19) Kara. 



N. liher W. Sm. (A. S. Atl. PL L, fig. 16—18) GreenL, 

 Spitsb., Finm. 



var. elongata Grun. (N. elongata Grun. A. S. Atl. PL L, 



fig. 27—29). 



N. /Scoi^^/Zon/wBreb. — Cape Deschnew (East Cape); a large spe 

 cimen,0,i7 mm. in length, 0,oi mm. in breadth; striae 23 inO,oi m.m. 



Sectio: Quadriseriatce. 



N. stdjdivisa Grun. (A. Diat. pag. 29, PL I, fig. 20) GreenL, 

 Mushroom Point, Kara, Cape Deschnew (East CapeV 



