Hie: 
Fic. 
EXPLANATION OF EPRALE X1r 
POLYZOA OF SEISTAN. ° 
Plumatella (Hyalinella) bigemmis, sp. nov. 
Len! 
.—A part of the peripheral region of a mature but growing 
colony on the stem of a bulrush, showing the resting 
statoblasts, X 5%. 
.—A part of the peripheral region of a more compact and 
vigorous colony, X 5%. 
The white substance in the interstices between the zooecia is composed of 
microscopic algae. 
N 
.—Three zooecia containing statoblasts, X 40. 
On the right a zooecium in which the polypide has completely degen- 
erated and a single free statoblast has been produced, is shown 
growing over aterminal zooecium in which a single fixed statoblast 
has been formed. The degenerated polypide of the latter is also 
shown. Its roof has largely disappeared. On the left a zooecium 
with a single statoblast is figured. 
Oo 
Plumatella (Afrindella) persica, sp. nov. 
. 4.—Fixed statoblasts, X 40. 
5.—A part ofa still vigorous colony growing ona rootlet, X 5%. 
6.—A part of a colony in which most of the zooecia of the 
upper layer have degenerated and disappeared, leaving 
those of the lower layer exposed. The roof of the 
latter has also degenerated, exposing the fixed stato- 
blasts, X 5%. 
7.—Free statoblasts, X 40. 
