84 Journal of the Asiatic Society of Bengal. [March, 1911.] 
assumed that the investment was produced by the polyzoon, 
but there seems to be no direct evidence that this is the 
case, and the question naturally occurs, is not it rather pro- 
duced by a symbiotic alga? The polyzoon does not appear to 
possess any special mechanism for its secretion, whereas alge 
of the genus Dactylococcopsis are usually contained in a gela- 
tinous mass. Iam not aware that any such alga has been des- 
cribed from the Palzarctic species of Pectinatella, but the fact 
that in their case also the investment has a greenish colour 
would suggest that one is associated with them.—N. A.] 
Mrcrocystis orissica (W. West); colonize subspherice, 
sordide olivacee, 24—40, lat., interdum 48) lat.; cellulis 
subellipsoideis, srugineis, 0-'8—0-9 » lat., rarius 1:0 p lat. 
Colonize cum Pectinatelld burmanicd associate. 
[The colonies of this alga were found associated, perhaps 
fortuitously, with the compound colonies of Pectinatella bur- 
manica in the investment of which Dactylococcopsis pectina- 
tellophila occurred, the losality being Sur Lake near Puri, 
Orissa.—N. A.] 
EXPLANATION OF PLATE III. 
Figs. 1—5, Tolypothrix lophopodellophila, sp. nov. 
Fig. 6, Dactylococcopsis pectinatellophila, sp. nov. 
Figs. 7—9, Microcystis orissica, sp. nov. 
Pe 
