Diatoms from North-East Greenland. 245 



Cocconeis maxima (A. CI.) Øst. forma minor, cf. A. CI., Lul. 

 Lappm., 24, Tab. I, figs. 22—23 (Achnanthid. maxim. A. CI.). 



Loc. Hvalrosodde. 



A. Cleve states that the length of Achnanthidiiim maximum is 0.065 mm 

 (an epitheca) and 0.075 mm (a hypotheca) and she saj's (1. c.) "Though not 

 seen together, the two valves described above, found in the same sample, 

 certainly belong to the same species."' 



On an average my specimens are somewhat smaller (Length 48— 56/j, 

 only one specimen measures 60//), but otherwise they agree well with A. 

 Cleve's figures. 



As I have seen both valves in situ I can affirm that they are corres- 

 ponding valves. 



Cocconeis maxima var. kmceolata var. nova. Tab. nost XIV, 

 fig. 14. 



Long. 74«. Lat. 22^«. Str., media in valva, 16 — 17 in 10«, apices 

 versus densioribus. 



Valva rhombice-lanceolata, apicibus rotundatis. Epitheca: Area 

 centrali qvadrata magna. Hypotheca: Raphe sigmoidea, area hyalina 

 angustissima, media in parte valvæ in aream parvam subcircularem 

 dilatata, cincta. Striis radiantibus. Nodulis terminalibus, paululum 

 a margine remotis, in spatio laterali nudo situatis. 



Loc. Hvalrosodde. 



As in the figure of Cocc. flex, interm., so also here, I have indicated 

 the extent of the central area of the epitheca as I have only seen both 

 valves in situ. 



Cocconeis minuta Cl., Cl. Syn., II, 179; Lgst., Spb., Tab. XIV., 



fig. 16 (Cocc. Thwaitesii var. ^i arctica). 



Loc. Hvalrosodde, Nostoc. 

 Ar et. Distr. E. Greenl.; Spb. 



Åclmanthes Bory, 1822. 

 Subg. Microneis Cl. 1995 pro gen. 

 Achnanthes linearis W. Sm., Cl. Syn., II, 188; V. H. Trt., Tab. 

 VIII, fig. 335. 



Loc. Hvalrosodde. 



Not before recorded from Arctic regions. Several other records. 



Achnanthes microcephala Kütz., Cl. Syn., II, 188; V. H. Trt., 



Tab. VIII, fig. 332. 



Lot. Hvalrosodde (2 sampl.). 

 Arc t. Distr. E. Greenl. 



Subg. Achnanthidiiim Cl., 1895 pro gen. 

 Achnanthes coarctata Bréb., Cl. Syn., II, 192; Lgst., Spb., 

 Tab. I, fig. 16 (Achnanthid. coarct. elineata). 

 Loc. Hvalrosodde (2 sampl.). Dove Bugt. 

 A ret. Distr. E. Greenl., Spb., J. M. 



