36 R. Grdnblad, New Desmids. 



different vertical view. Compare also C. geometrician West, 

 Mngr. Ill pi. 71 f. 5 — 6 and var. adoxoides West, Perry 

 Stud. pi. 2 f. 47. Is perhaps nearest to C. abbreviation R a c. 

 f. germanica Rac, Nowe Desm. pi. 5 f. 32, which differs 

 with twice the size and a regular depressed-elliptical vertical 

 view. 



Hab. (SW?), leg. Elfv. PI. 7 fig. 21—23. 



C. abbreviatum Racib. forma germanica Racib., 

 Nowe Desm. pi. 5 f. 32. Forma cellularum varians, sed 

 apex semper plus minus protusus. Sinus modo apertus, 

 modo clausus. Cellulae a vertice visae anguste oblongae. 

 Long. 13,2, lat. 14,5, isthm. 5,3//. [N:o 1125 a, 1125 b]. 



Compare also C. murrayi Playf., Sydn. Desm. pi. 5 

 f. 19; West, Alg. Yan-Yean pi. 4 f. 5. — C. pseudoretusi- 

 forme nob. (supra). 



Hab. Gov. of Archangel. PI. 7 fig. 7 and 8—9. 



C. pygmaeum Arch. var. atumidum nova var. Semi- 

 cellulae a fronte visae depresse oblongae non angulosae, 

 apice levissime et late convexo, angulis basalibus valde 

 rotundatis; membrana sub apice utrimque ad latera versus 

 granulis singulis parvis et in centro semicellularum granulis 

 singulis ornata. A vertice visae anguste oblongae lateribus 

 medio non tumidis sed utrimque granulis 3 ornatae. Long. 

 8,6, lat. 9,9, crass. 5,3, isthm. 3,9//. [N:o 1123]. 



On account of this species including various forms 

 with very different outline I have thought it possible to 

 unite our variety with this. In fact it is very near to the 

 form figured in West, Mngr. Ill pi. 71 fig. 23. 



hab. Esbo (S), leg. C. Cz. PI. 7 fig. 19—20. 



C. novae-semliae W i 1 1 e var. sibericum Boldt; West, 

 Mngr. Ill pi. 68 f. 18. Forma papilla centrali abrupte trun- 

 cata et granulis omnibus truncatis elongatis quasi papilli- 

 formibus. Long. 14, lat. 13, crass. 7, isthm. 6 u. [N:o 1053]. 



Hab. Raikala near the Imatra Falls (SE), leg. Hj. Hjelt. — 

 PI. 7 fig. 10—12. 



C. venustum Breb. var. laticeps, nova var. Cellulae 

 maiores, subrectangulares; lateribus, ut in typo, triundulatis, 



