List of Freshwater Algæ. 79 



Cosmariuni (Corda) Ralfs. 

 1. С. bioculatum Bréb., in Ralfs, Brit. Desm. p. 95, tab. 15, fig. 5. 



Boldt, Desm. Gronl , p. 16 (Kung Oskars hamn). 



Børgesen, Ferkvandsalg. Østgrønland, p. 18 (Røde 0, Hekla Havn). 



Larsen, Freshw. Alg. East Greenland, p. 88 (Kap Borlase Warren. Sabine 0). 



A form agreeing well with that mentioned by Nordstedt, Desm. 

 arct., p. 20, tab. 6, fig. 8 was fonnd in Vester Elv. 



Long. = 29,« ; lat. = 21 ij.\ lat. isthm. 9//. 



Loc. Danmarks Land. 

 2. C. Botrytis (Bory) Menegh., Synops. Desm. p. 220. 



Boldt, Desm. Grønl., p. 28 (Kung Oskars hamn). 



Børgesen, Ferskvandsalg. Østgrønland, p. 13 (Hekla Havn, Danmarks 0). 

 Larsen, Freshw. Alg. East Greenland, p. 83 in several localities from Kordlortok 

 (65° 40')— Кар Borlase Warren (74° Г). 



Some few specimens were found in collections from Vester Elv. 

 Loc. Danmarks Havn. 



3. С. conspersum Ralfs, Brit. Desm., p. 101, tab. 16, fig. 4. 

 ß rotundatum Wittr., Skandin. Desm., p. 13, tab. I, fig. 4. 



Børgesen, Ferskvandsalg. Østgrønland, p. 13 (Hekla Havn, Røde 0). 



Larsen, Freshw. Alg. East Greenland, p. 84 (Jameson Land, Kap Borlase Warren). 



A form rather near that mentioned by Boldt (Desm. Grønl. p. 26, 

 tab. 2, fig. 27) was found in a collection from a small lake at Hvalrosodde. 

 Long. == 80// ; lat. = 65 ij. ; lat. isthm. = 24 // ; crass. = 39/^. 

 Loc. Hvah-osodde. 



4. C. crenatum Ralfs, Ann. Nat.' Hist., vol. 14, p. 394, tab. 11, 

 fig. 6; BriL Desm., p. 96, tab. 15, fig. 7. 



Boldt. Desm. Grønl., p. 18 (Kung Oskars hamn). 

 Børgesen, Ferskvandsalg. Østgrønland, p. 14 (Hekla Havn). 



Forma "Crenæ laterales 3", Nordstedt, Desm. Spetsberg. p. 30, 

 tab. 6, fig. 7. 



One specimen was found in Vester Elv. 



*costatum Nordstedt, Desm. Spetsberg, p. 30, tab. 6, fig. 9. 



Long. = 41//. 



Found in the same locality. 



Loc. Danmarks Havn. 



5. С. cyclicum Lund., Desm. Suec, p. 35, tab. 3, 

 fig. 6. 



*arcticum Nordst., Desm. Spetsb., p. 31, tab. 6, 

 fig. 13. 



Ч- ,., . , .. > Fig. 1. с cycZJcin;jLund. 

 Børgesen, Ferskvandsalg. Østgrønland, p. 1,) Hekla Havn . . ^. ., , . ,.,-„, , 



Larsen, Freshw. Alg. East Greenl. p. 84 (Атака, Falkefjæld, 



Kingorsuak, Kap Dalton, Liverpool Kyst in Hurry Inlet, Sabine O). 



This species was absolutely the most common in the collections 



