[ 41 J 



II. A Contribution tS our Knoioledge of the Freshwater Algce of Madagascar. By 

 William West, F.L.S., and Geoege S. We^, A.B.C.S., Scholar-elect of St, Johns 

 College, Cambridge. 



(Plates V.-IX.) 



Eead 1st February, 1894. 



jBY the kindness of the Bey. E/. Baron, of Antananarivo, we hare been enabled to examine 

 a number of gatherings of Algae from that district which he has most obligingly collected 

 at the request of one of us. The result is very pleasing, as many new and interesting 

 species have thus been revealed, and considerable additional knowledge of the distribution 

 of known forms has been attained. The naming of the Diatoms has been left to a future 

 occasion. The Cosmaria are particularly fine and noteworthy. 



It will be noticed that the larger Algae are hardly represented ; this is due to the fact • 

 that these tentative collections were made chiefly with the view of securing the smaller 

 forms. 



The number after each species corresponds to the particular locality from w^hich it was 

 obtained. With the exception of one number, we do not at present kno^v the corre- 

 sponding localities, but hope to give them at some future date (see Note on p. 90) : 



No. 36. Mud from the bottom of Lake Alastra (a yard deep). 



Summary of Genera, Species, and Varieties. 



Varieties and 

 Forms. 



Orders. Genera. Species. 



Coleochsetacese 1 1 



CEdogoniaceae 2 5 



Zygnemacese 1 3 



Desmidiaceae 12 145 32 



Pediastreae 1 "^ I 



Sorastrese 2 2 



Eremobiae 2 4 



Protococcaceae 4 10 9 



Uivulariacese 1 1 



Scytouemaceae 1 1 



Sirosiphoniaceae 1 I 



Oscillariaceae 1 I 



Chroococcaceae 2 3 



Total 31 181 42 



SECOND series. — BOTANY, VOL. V. 



