— 
Vol. IT, = 3.| Notes on the Freshwater Fauna of India. 59 
[N.S.] 
8. Notes on the Freshwater Fauna of India. No. IL. cae ‘hang 
of Hislopia.—By N. Annanpate, D.Sc., C.M 
The genus Highaysa was founded in 1858 by Carter for a fresh- 
water Poly zoon! sent to him in spirit from Nagpur by Hislop the 
geologist ; while in 1880 Jullien * described a form, which he recog- 
m 
ing his diagnosis entirely on external characters. The systematic 
position of these Polyzoa has remained obscure, Stoliezka,* who 
referred to the existence of Hislopia in Lower Bengal in his ac- 
count of the brackish water Membranipora a soe did not 
carry out his intention of describing its life history. A recent ex- 
amination of living material from a tank on this Calcutta ‘ maidan’ 
venir me to give a general account of the anatomy of Carter's 
speci H. lacustris, and to indicate its affinities in general and 
its relationship to Norodonia. 
arter, regarded his new genus as allied to Flustra, de- 
scribed the ole as “ spreading in aggregation over smooth sur- 
moner than any other, but occasionally several zocecia are adjacent 
to one another in a transverse series. This may be due either to 
he zoariu 
layer of cells. The substance of the zoccia is transparent but 
stiff, while the thickened margins of the orifice have a deep brownish 
tinge 
a The individual zocecia are described by Carter as “ irregularly 
ovate, compressed,” and his figure (op. cit. pl. VII, fig. 1) shows that 
iar variation in their outline is brow; ht about by the 
same figure, a considerable flattened area between some of the cells, 
he does not note that their horny margin is of considerable width, 
and his fig. 2 is misleading in this respect. Moreover, the relative 
length of ‘the spines at the angles of the thickened borders of the 
orifice is more variable than he indicates. In some zoccia t ey 
cjee i are a ver marked feature; the actual plate el normal 
s of oonsidaviahie ce Even when the colony pene of a 
bes line of zocecia these depressions pee be present on the sides 
as well as the extremities of each cell. They then indicate that 
lateral budding is about to commence ; for — no oonterie 
| Ann. Mag. Pin t. Hist. (3) I, ‘got one) La VII. 
ull. Soc. Zool. France, 1880, p 
§ Ibid. 1885, page 181. 
4 Journ, As. Soc. Bengal. XXXVIII,(2), page 61. 
