14 R. Gronblad, New Desmids. 



Hab. The larger form: Raikala (SE), leg. Hj. Hjelt; the 

 smaller: Gov. of Archangel. — PI. 3 fig. 16 and 19. 



Eu. binale (Turp.) Ehr. Forma lobo polari medio 

 leniter retuso, angulis non acutis, sub margine apicali 

 granulis 4 difficillime conspicuis ornato. Ceterum membrana 

 glabra. A vertice visum crassum, medio utrimque tumore 

 centrali haud multum prominenti sed tamen conspicua, polis 

 subrotundatis. Long. 21, lat. 16,5, crass. 9,5, isthm. 4,6 ,". 

 [N:o 1017]. 



This form should be compared with: E. subincisum 

 Reinsch (Contrib. Alg. Bon. Spei pi. 6 f. 12); E. laticolle 

 West (in Journ. Bot. 1912 p. 89 and fig. 6); E. cosmarioi- 

 des v. curtum West (Singapore pi. 8 f. 18 — 19). 



Hab. Karkku, leg. Hj. Hjelt. PI. 3 fig. 20—21. 



Forma ad praecedentem accedens, sed minor, apice 

 non granulato, a vertice visa cellulis minus crassis. Long. 

 15,8, lat. 13,2, crass. 7,3, isthm. 4 fi. [N:o 1023]. 



Compare also: Cosmar. emarginulum Perty; R a c i b., 

 Desm. Poloniae pi. 4 f. 12; Cosm. trilobulatum Reinsch 

 v. depressum Printz, Beitr. Norweg. pi. 2 f. 42; Cosm. 

 quadratulum (Gay) De Toni; West, Mngr. Ill pi. 93 

 f. 4 a". 



Hab. (SW), leg. Elfv. PI. 3 fig. 22—23. 



var. pseudogutwinskii, nova var. Cellulae parvae medio 

 sinu profundo anguste lineari constrictae. Semicellulae sub- 

 pyramidatae e basi recta, angulis basalibus rotundatis, lobis 

 lateralibus 3-undulatis, lobo polari abrupte truncata medio 

 incisura parva dissecto utrimque angulis dente parvo arma- 

 tis. Membrana intra margines granulis nonnullis parvis 

 ornata, in centro eminentia inconspicua scrobicula conspicua 

 perforata est. A vertice visum anguste ellipticum, polis 

 subacutis, medio utrimque eminentia minima. Long. 23, 

 lat. 16,*, isthm. 3 u. [N:o 832]. 



Very near to f. gutwinskii Schmidle, but is distinguished 

 by the granulate cell-wall, the shorter polar lobe and the 

 central scrobicula. 



Hab. Gov. of Archangel. PI. 3 fig. 24—25. 



