176 KAARE MÜNSTER STRØM. 



164. Cosmarium quadrifarium. Lund. 



This characteristic species was not uncommon. I have 

 figured the central granules of a specimen. Size: long. 43 ;U, 

 iat. 34 u. PI. IV, Fig. 1. 



165. ? Cosmarium bisphœricum. Printz. 



Printz: Chloroph. Norweg. p. 27, tah. III. fig. 51—52. 

 Very rare. I have only examined a single specimen. 



166. Cosmarium ornatum. Ralfs. 

 Somewhat scarce. 



167. Cosmarium reniforme. (Ralfs) Arch. 

 Somewhat rare. 



168. Cosmarium sp. 



This was a very curious species, intermediate between G. 

 reniforme and G. Portianum. It bears greatest resemblance 

 to C. reniforme var. apertum W. & G. S. West. I regret very 

 much that I made no drawing of it, as I only observed a single 

 specimen. 



169. Cosmarium Portianum. Arch. 

 This was no uncommon desmid at Tuddal. 



170. Cosmarium isthmochondrum. Nordst. 

 Rare. 



171. Cosmarium prœmorsum. Breb. 

 Rare. 



172. Cosmarium margaritiferum. Menegh. 

 General, but somewhat scarce. 



173. Cosmarium pimctulatum. Breb. 

 Scarce. 



173 a. var. suhpunctulatum. (Nordst.) Börgesen. 

 Gommoner than the typical form. 



174. Cosmarium humile. (Gay) Nordst. 

 General, and often in abundance. 



174 a. var. striatum. (Boldt) Schmidle. 

 As abundant as the type. 



