58 R. Gronblad, New Desmids. 



var. heteracanthum Gronbl., ibid. pi. 1 f. 27 — 28. A 

 figure of the front view will here be published. Cum spin, 

 long. 55, lat. 61, isthm. 15 fi. [N:o 1201]. 



Hab. Esbo (S), leg. C. Cz. — PI. 5 fig. 7—8. 



forma. Ad var. verrucosum Gronbl. accedens. 



Cum spin. long. 53, lat. 64, isthm. 17//. [N:o 1218]. 



Hab. Esbo (S), leg. C. Cz. PI. 5 fig. 9-10. 



S. cornutum Arch. A 4-angulate form was observed, 

 very much resembling S. forficulat: v. heteracanth. These 

 two species appear to be closely related and could perhaps 

 be united to one. — Cum spin. long. 49, lat. 53, isthm. 17 fi. 

 [N:o 1159]. 



Hab. Keuru (C). — PI. 5 fig. 11—12. 



S. cedercreutzii, nova sp. Cellulae parvae medio sinu 

 profundo valde aperto introrsum quasi acuminato lateribus 

 primum valde, mox minus divergentibus. Semicellulae a 

 fronte visae crasse subfusiformes, apice convexo verrucoso, 

 ad polos (truncatos, apice 6-granulatos) versus utrimque at- 

 tenuato. Membrana seriebus granulorum longitudinalibus 8, 

 dorso verrucis depressis, ad isthmum cingulis simplicibus 

 granulorum ornata. A vertice visae triangulae, angulis 

 truncatis, lateribus undulatis haud multum retusis; membrana 

 ad angulos transversaliter granulata, medio in area tri- 

 angulari glabra (circa earn in unoquoque latere verrucis 3 

 bi- vel trigranulatis armata. A ventre visae ad angulos trans- 

 versaliter granulatae, medio glabrae circulo tantum prope 

 isthmum ornatae. --Zygospora angulose globosa processubus 

 brevibus apice trifurcatis armata. Long. 25—27, lat. 22 — 24, 

 isthm. 8 — 8,5, zygosp. diam. c. proc. 38/'. [N:o 1131]. 



Hab. Esbo (S), leg. C. Cz. PI. 5 fig. 21—23. 



S. polymorphum B r e b. This species is very often 

 mentioned in lists of desmids, but a figure in which the 

 structure of the cell-wall clearly is to be seen has never 

 been published. I will now publish some drawings of this 

 species made from specimens in W i 1 1 r. & N o r d s t. ex- 

 sicc. n:o 71. The cell-wall is finely and acutely granulate; 

 the apices of the processes furnished with 4 short but 



