4 P. T. CLEVE, DIATOMS FROM FRANZ JOSEF LAND. 



collected oii an ice-floe, driftiiig 48 miies south of Bell Isle, 

 a small quantity of mud, which contained diatoms spariiigly. 

 All these samples, amounting to about 20 and collected 

 chiefly at Cape Flora, bnt with a few from Cape Neale and 

 Bell Isle, were delivered to me» for examination with the 

 following results. 



Galonets fasciata (Ldt). — Cape Neale, on roots of Luzula, 



very rare. — L. 0,027; B. 0,oo6 mm. — Str. 20 in 0,oi mm. 



C. Clevei (Ldt). — Cape Flora, eastern glacier, very rare. 



C. silicula (Ehb.) v. alpina Cl. — Very rare, eastern glacier. 



Cape Flora. L. 0,02 8 ; B. 0,oo6 mm. Strise 19 in 0, 01 mm. 



v. niinuta Grun. — L. 0,02; B. 0, 005 mm. Str. 25 in 

 0,01 mm. — Sparingly in almost all samples. 



v. ventricosa Donk. — L. 0,0.0; B. 0,oo7 mm. Str. 20 in 

 0,01 mm. — Very rare. Cape Flora. 



Neidium hisulcatum Ldt. — Common in all samples. 

 N. iridis Ehb. — Sparingly in niost samples. L. 0,05 6; 

 B. 0,0 17 mm. Striee 17 in 0, 01 mm. 



v. ampliata. — Somewhat rare. L. 0,03; B. 0, 01 mm. 

 Str. 19 in 0,oi mm. — Scarcely distinct from N. affine. 

 Diploneis elliptica Kutz. — Cape Flora, rare. 

 D. arctica Cl. N. sp. — Valve elongated, with 

 broad, rounded ends. L. 0,03; B. 0,oo7 mm. Central 

 nodule small. Furrows narrow. Strise 23 in 0,oi mm., 

 more distant in the middle, indistinctlj^ punctate. 



This form comes nearest to D. oculata Bréb., 

 from which it differs by larger size, more elongated 

 form and by the strifB, more distant in the middle. 

 Fig. 1. It occurs in most samples, bnt never in any abund- 

 '''''■'^- ance. 



Navicula minima v. atomoides Grun. — Cape Flora, very 

 rare. L. 0, 01; B. 0,oo5 mm. Striee in the middle about 18. 

 N. semimdum Grun. — Not rare in several samples. 

 JSf. Rofaeana Rabh. — Sparingly in some samples. 

 v. ohlongella Grun. — Cape Flora, rare. 

 N. mutica Kutz. — Common and very variable. The most 

 frequent forms are v. Cohnii and v. ventricosa. 

 The variety undidata Hilse is very rare. 

 N. Heufleriana Grun. — Occurs in many samples, but 

 never abundantly. 



N. nivalis Ehb. — Cape Flora, West Point, very rare. 



