Acta Societatis pro Fauna et Flora Fennica, 49, N:o 7. 59 



strong spines. Long. 28, lat. (c. spin.) 37—39, isthm. 8—9 (i. 

 [N:o 890 b]. 



PI. 5 fig. 17—20. 



var. pygmaeum, nova var. Cellulae multo minores prae 

 longitudine latiores. Semicellulae fusiformes angulis (= polis) 

 non productis, anguli aculeis 3 firmis armati ; granula sparsiora ; 

 a vertice visum lateribus plus retusis, angulis non productis. 

 Long. 18, lat. 26, isthm. 5,5 /t. [N:o 890 a]. This variety 

 is distinguished by its smaller size and by the angles, which 

 are not produced into processes. 



Hab. Gov. of Archangel. PI. 5 fig. 33—34. 



S. bicorne Hauptfl. varrquadrifidum, nova var. Forma 

 cellularum et radiorum ut in var. longeradiatum B o r g e 

 (Austral, p. 16 pi. 2 f. 22). Ad basim semicellarum utrimque 

 supra isthmum verrucae singulae maiores superiusque singu- 

 lae dimidio-minores, in medio semicellularum eminentia mem- 

 brana incrassata conspiciuntur. Radii longi, tenues, graciliter 

 curvati in ipso margine subtiliter denticulati, in apice spinis 

 4 armati sunt. A vertice visae rhombiformes utroque polo 

 in radios producto; membrana intra margines radiorum 

 duabus seriebus granulorum acutorum longitudinaliter ornata; 

 marginibus ipsis plane glabris; in parte media utrimque 

 seriebus simplicibus verrucarum armata. Cum proc. long. 

 53, lat. 95; sine proc. long. 38; isthm. 9, crass. 21 (i. [N:o 849]. 



In agreement with Borge's variety our form likewise 

 differs considerably from the typical one in being slenderer 

 with a comparatively smaller basal portion and longer pro- 

 cesses. In the vertical view only a simple row of verrucae 

 on each side in the inflated median portion can be seen, 

 whereas there are double rows in the type. The median 

 inflation possesses a thickening of the cell-wall. — Compare 

 also S. bicorne v. boreale Schmidle (Pite Lappm. p. 61 

 pi. 3 f. 11) and 5. pseudosebaldi ft bicorne Boldt (Sibir. 

 Chlor. p. 117 pi. 6 f. 36), which latter by Schmidle was 

 united with his variety as a „forma sibirica S c h m." Also 

 S. paradoxum /? fusiforme Boldt (ibid. pi. 6 f. 37) is by 

 Schmidle made a variety of S. bicorne; but as already 



