256 REV. E. o'meara, 



Surirella fastuosa, W. Sm. = Novilla fastuosa, Cleve. 



Systephania anglica, Donk., possibly = * Thalossosira 

 Nordenskioldii, Cleve. 



Those marked with an asterisk are new forms described 

 by Cleve in his work ' On Diatoms from the Arctic Sea/ to 

 which those interested on the subject are referred for further 

 information. I may be permitted, however, to make a few 

 remarks concerning two of them, namely, Amphiprora longa 

 and Navicula {Amphiprora ?) arctica — the author is doubtful 

 to which genus the latter-named species belongs. 



Amphiprora longa seems to me to bear a very strong 

 resemblance to Amphiprora lepidoptera, Greg. {' Diatomacese 

 of the Clyde,' PI. xii, fig. 59) ; so much so that I should be 

 almost disposed to consider it identical with that species. 



Of Navicula arctica I have found, as I suppose, some few 

 specimens ; at least, they so closely resemble in shape and 

 general character of the striation that figured by Cleve under 

 that name that I would consider them scarcely distinct, 

 although there is this difference between them, that, while in 

 Cleve's form the inner band curves inward towards the central 

 nodule, in my specimens the same band bends nearly parallel 

 with the curvature of the external margin of the frustule, as 

 shown in PL VIII,'fig. 1. 



The species thus marked f in the above list, namely, Gram- 

 matophora arctica. Amphora lanceolata, and Navicula pinnu- 

 laria, are very distinct and beautiful forms, described and 

 figured in papers of Cleve written in Swedish, and therefore 

 unavailable to the generality of English students ; I therefore 

 take the liberty of figuring them, and the rather, as I wish 

 to supply some additional particulars concerning them. 



Ch'ammatophora arctica, Cleve, " Diatomaceer fran Spets- 

 bergen," ' Ofversigt af Kongl. Vetenskaps Akad. Forhandlin- 

 gar,^ Stockholm, 1868, p. 664, Taf. xxiii, fig. 1, is of very 

 frequent occurrence, as are also the other two forms just 

 noticed. Cleve's figure of the side view presents no ap- 

 pearance of striation ; in some of my specimens the strise are 

 moniliform, as in PI. VIII, fig. 2 h. 



Amphora lanceolata, Cleve, / Diatomaceer fran Spets- 

 bergen,^ Taf. xxiii, fig. 2, is described as having persistent 

 costse, only becoming very faint as they approach the median 

 line; in the very many specimens which came under my 

 notice the median line is more strongly developed than in 

 Cleve's figure, and a considerable portion of the valve in its 

 proximity is quite free from striae, as shown in Pl.VIII, fig. 3. 

 These specimens from Spitzbergen agree in all respects with 

 some of the same species found by me many years ago in a 



