78 ^- HORGESEN. 



The size of the plant corresponds closely with that Nordstedt 

 gives for the plant found at Mosel Bay in Spitzbergen (Nordst., 

 Desm. arct. p. 15) but it is much smaller than the size West gives for 

 the plant in his Monograph of the British Desmidiaceæ, vol. I, p. 38. 



This species has not earlier been found in East Greenland and 

 it is also not mentioned from West Greenland (cfr. Larsen, II). Only 

 found in few specimens in Vester Elv. 



Lo с. Danmarks Havn. 



Closterium Nitzsch. 

 L CL acutum (Lyngb.) Bréb., in Ralfs' Brit. Desm., p. 177, 

 tab. 30, fig. 5. 



Børgesen, Ferskvandsalg., Østgrønland, p. 10 (Hekla Havn). 



Larsen, Freshw. Alg. East Greenl. p. 81 (Kordlortok, Liverpool Kyst in Hurry Inlet). 

 Lo с. Danmarks Havn. Only a few specimens found in Vester Elv. 

 Lat. cell. = 11 ^^. 



2. CI. striolatum Ehrenb., Entw. d. Inf. p. 68. Ralfs, Brit. Desm., 

 p. 170, tab. 29, fig. 2. 



Boldt, Desm. Grønl. p. 42 (Kung Oskars hamn). 



Børgesen, Ferskvandsalg. Østgrønland, p. 10 (Hekla Havn, Røde 0). 



Larsen, Freshw. Alg. East Greenl., p. 82 (Атака, Liverpool Kyst in Hurry Inlet). 



Only a single specimen was found, the breadth of w^hich was 50 /^. 

 Loc. Danmarks Havn: Vester Elv. 



Pleiirotæniiim Näg. 



1. P. truncatum <Bréb.) Näg., Gatt. einz. Alg., p. 104. 



Only a single specimen found in a collection from Vester Elv. 



Long. = 400^,; lat. = 54 «. 



In size it agrees very well with the measurements given by 

 Nordstedt for plants found in Spitzbergen and Bear Island (Nord- 

 stedt, Desm.Spetsb. p. 26). 



This species was not earlier recorded from East Greenland but 

 it is known from West Greenland (Larsen, II, p. 346). 



Loc. Danmarks Havn. 



Tetmemorus Ralfs. 

 1. T. lævis (Kütz.) Ralfs, Brit. Desm. p. 146, tab. 24, fig. 3. 

 ß attenuatus Wille, Ferskvandsalg. Nov. Semlja, p. 58, tab. 14, 

 fig. 77. 



Boldt, Desm. Gronl. p. 42 (Kung Oskars hamn). 



Larsen, Freshw. Alg. East Greenl. p. 101 (Атака Кар Dalton). 



Only one half-cell was found; the cell-membrane was minutely 

 punctate. 



Lat. cell. = 28//. 



Loc. Danmarks Havn; Vester Elv. 



