2 KAARE MÜNSTER STRØM 



Among the animals he collected were numerous specimens 

 of the tortoise Chelodina oblonga, from the lagunes near 

 Daly River. 



On this tortoise Algæ grew in abundance. — I have inspected 

 one collection of these Algæ, and was surprised to find a rich 

 representation of various Desmids, growing between the branches 

 of Cladophora. 



On the whole, I observed 24 species of Desmids, among them 

 many rare ones, which are only observed once or twice before by 

 other algologists. 



The Desmids represented in the collection were of a striking 

 Indo-Malayan and Australasian type. The Indo-Malayan is 

 prevailing if one may judge from such scarce material, in the 

 North of Australia. 



Our knowledge of the tropical Algæ is still very incomplete, 

 in spite of the researches of several eminent algologists, and 

 I therefore think the following list may be of some interest. 



List of the Species. 



Glass Cliloropliyceæ, 



Order Conjugatæ. 



P'araily Desrnidiaceæ. 



Genus Pleurotœnmm Naeg. 



Pleurotœnium Ehrenhergii var. Borget W. & G. S. West. 

 W. & G. S. West: Gontr. Fresh w. Algæ Gey lon. 



This form of the species was very scarce. The cells agreed 

 fairly well with the figures and descriptions of Messrs. West. 



They bare, however, certain resemblance to the typical form, 

 also, and I am in doubt if the variety should be considered as 



