Acta Socictatis pro Fauna et Flora Fennica, 49, N:o 7. 23 



Janeiro. (R a c.) G r 6 n b 1. and var. protuberans G r 6 n b 1. 

 Desm. Keur. there is a form much resembling" the latter 

 and not seldom met with. It has a high polar lobe with 

 widely outstanding lobules and lateral lobes with long 

 outdrawn basal lobules nearest to the sinus. 



Hab. Lempaala near Tammerfors (W). — PI. 1 fig. 16. 



M. radiata Hass. A very curious monstrous semiceli 

 resembling M. ceratophora Josh, was observed. 



Hab. Keuru (C). — PI. 1 fig. 12. 



M. sol (E h r.) Kiitz. Also this species is very vari- 

 able. An unusually large form of var. ornata Ndt. was 

 observed (length = breadth - 228 ,u). 



Hab. Keuru (C). 



M. murrayi W & G. S. West. It must be considered 

 as very doubtful whether the species of West really can 

 be clearly distinguished from various forms of M. sol var. 

 ornata Ndt. These seem to me to be so nearly related in 

 all respects that I should think it might be better to unite 

 them in one species. The Karelian form generally quite 

 well agrees with the English, but especially the sinus between 

 the two semicells is much less open. The rest of the 

 peculiarities of this species, viz. the concave sides and the 

 less depth of the incisions, the absence of the further sub- 

 division of the superior lateral lobes are also met with in 

 M. sol var. ornata; likewise I have observed forms of this 

 species with a broadly dilated polar lobe. — Length 156—158, 

 breadth 144—145, isthm. 16—18, 1. pol. lob. 60, br. pol. lob. 

 (apex) 44/'. 



Hab. Gov. Archang. — PI. 1 fig. 13. 



M. rotata (Grev.) Ralfs. Even this species varies 

 very much in Finland. It is only seldom that I have seen 

 forms thorougly agreeing with the figure given in W e s t's 

 Monograph II pi. 48 f. 1. Moreover I have never seen spe- 

 cimens with such thick cells „a vertice" as shown in the 

 figure 4 by W e s t (copied from Mr Archer). The relation 

 between the breadth and the thickness of the cells should 

 be about 3,3 but I have measured 4,4; moreover, I have 



