Ta a lll 
Vol. II, No. 3.] . Notes on the Freshwater Fauna of India. 61 
[N.S.] 
as yet exists, a roundish mass of undifferentiated tissue on the 
inner wall of the zocecia opposite their base represents the young 
bud. Occasionally a very short, flat creeping stolon is produced 
between two zocecia. 
It is ouly as regards the zocecia that it is possible to compare 
the diagnoses of Hislopia and Norodonia. The following is a 
translation of that of the latter :— 
i ‘a horny, creeping, strongly adherent to submerged 
bodies, originating one from another below the summit to form 
linear series, primitive axis of the zoarium rapidly giving rise to 
secondary, tertiary and other axes, these appear ona level with the 
upper third of the zowcium, sometimes on one side, sometimes on 
two; lateral margin thick, bearing a delicate membranous area, 
near the summit of which is the orifice.” (1885). 
Allowing for the dried condition of the specimens examined, 
this diagnosis applies equally well to Hislopia. In dried specimens 
of H. lacustris the front collapses below the margins, which then 
appear thickened, and the tubular character of the orifice is less 
For these reasons I regard Norodonia as a synonym of Hislopia. 
lien’s N. cambodyiensis is specifically identical with 
‘ i t figures bear a 
close resemblance to dried examples ‘of the latter. 
As regards the polypide of H. lacustris, one or two sca 
features may b The lophophore is circular, not horse-shoe- 
shaped as Jullien’s (1885) copy of Carter's figure would suggest. 
There is no epis folded collar, very conspicuous when the 
bankia, the walls of the orifice close in more or less tightly above 
the collar when the lophophore is retracted, but no projections of 
