8 R Gronblad, New Desmids. 



polis truncatis levissime constrictum"). Also very much 

 resembles C. spetsbergense var. australe P 1 a y f a i r, Frw. alg. 

 Lismore p. 319 [sec. auct. ips. synon. = C. lanceolatum ;l co- 

 loratum (Klebs.) Playf., Sydney Desm. p. 604 pi. 40 f. 1.] 

 which perhaps better could be united with C. pseudolimula. 

 Hab. Messuby (W). — PI. 5 fig. 42. 

 CI. spetsbergense Borge, Siissw. Alg. Spitzbg. pi. 1 

 f. 5, var. laticeps, nova var. Cellulae ad apices versus non 

 tarn attenuatae, apicibus latioribus levissime reflexis, margine 

 ventrali plus concavo; pyrenoidibus. in utraque semicellula 

 8—10 in unam seriem axilem dispositis; membrana plane 

 glabra achroa. Long. 338—448—456, lat. 38—40—44, apex 

 9—9—11 /*, [N:o 863, 951]. 



Though this variety has a different appearance, I do 

 not think it better to unite it with any other species. 



Hab. Esbo (S) leg. C. Cz; Messuby (W). PI. 5 fig. 43. 

 CI. lunula Ehr. Forma membrana subtilissime strio- 

 lata, achroa. (Striae distincte visibiles cum „Leitz obj. ] ie 

 homog. imm. X ok. III). Long. 669, lat. 87, apex 15 u. 

 [N:o 956] — I have examined a great number of specimens 

 of this species by high magnification and I have found on 

 the one hand entirely smooth forms (exeedingly minutely 

 porose), on the other hand very finely and densely striate 

 forms, the striation being well conspicuous by high magni- 

 fication. 1 was not able to decide whether there were two 

 distinguishable forms or only younger and older individuals. 

 Only I would call the attention of the algologist to this 

 fact, because C. lunula is always described as quite smooth. 

 Hab. Messuby (W). 



CI. rostratum E h r. Zygospora monstruosa angulis 

 protractis 3-dentatis. Long. cell. 228, lat. 19//; zygospora 

 53X68,". The zygospore figured in West, Monogr. 1 

 pi. 26 f. 5 is not quite an accurate copy of K a 1 f s' figure 

 (Brit. Desm. pi. 30 f. 3 e) in having truncate angles, whereas 

 the angles are excavate according to R a 1 f s. Moreover the 

 latter figure is not a good one, as the numerous zygospores 

 which I have seen from different localities in Finland were 



