470 CLEVE, DIATOMS. 



forma curta CI. Length 0,03 — 0,04 mm. Breadth 0,oo9 — 

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

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



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

 scarcely differs in anything hut coarser stri£e and is hy the 

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

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

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

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

 to be the following species. 



N. siibimpressa Grun. (A. Diat. pag. 39, PI. II, fig. 45) Kara. 



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

 Strise 18 in 0,oi mm. — PL 37, fig. 49. — Cape Deschnew (East Cape). 



N. distmis Sm. (Syn. L pag. 56, PL XVIII, fig, 169) GreenL, 

 (Davis strait) Spitsb., Finm. 



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

 Finm. 



Secfio : Betusce. 



N. fortis Greg. (A. Schm. Atl. PL XLVI, fig. 37—39) GreenL, 

 Spitsb. 



N. opima Grun. (A. Schm. Atl. PL XLVI, fig. 25—26) GreenL, 

 (Davis strait). 



N, jamalinensis CL (A. Diat. pag. 13, PL II, fig. 40) Jalmal, 

 Cape Deschnew (East Cape). 



N. canceUata Donk. var. impressa Ldt. (N. impressa Ldt. 

 Bih. 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. subapmdata Grun. (1. c.) Kara. 



var. Sclimicltii 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 

 difi:erent foci. 



Sectio : JDecipientes. 



N. Liindstrdmii CL (A. D. pag. 13, PL II, fig. 29) Kara. 



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



N. suhinflata Griin. Mpt. — Linear oblong, more or less gib- 

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

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



