1922. ] Cylindrospermum from Bengal, new Species, 579 
) 8, 
C. muscicola, a widely spread species, are oblong, the spores 
i 2 








Drawn by K. P. Biswas. 
Cylindrospermum doryphorum, sp. 0. 
are 10-20 » long and of a golden-brown colour; C. catenatum 
differs in the spores occuring in a row of two to eight and in 
the elongate heterocysts, and the heterocysts of C. humicola 
are globose. 
"The single filaments can often be seen to move slowly 
straight onwards, different filaments moving in different 
directions. 
