148 Records of the Indian Museum. (Vou. Vis 
has a well-marked chitinous border. The zooecia are too closely 
fitted together for a flat membrane to intervene, but their 
chitinous margins are well developed. 
Most of the zoaria in the collection had been overgrown by 
the Phylactolaematous species next to be described. They were 
only found on the carapace of Hardella thurgit in this instance, 
but Hislopia lacustris commonly occurs on the shells of molluscs 
of the genus Vivipara as well as on the leaves of Vallisneria 
spiralis, on logs, stones and other inanimate fixed or floating 
objects. Major Walton discovered the polyzoon Séolella indica 
growing over large zoaria in the United Provinces and the bases of 
the type-specimens of the sponge Corvospongilla burmanica from 
Pegu contained the remains of zooecia. The species is widely 
distributed in the tropical parts of eastern Asia. 
PLUMATELLA (AFRINDELLA) TESTUDINICOLA, sp. nov. 
Zoaria forming quite flat, oval or circular lichenoid patches 
with undulating or sinuous borders and in some instances as much 
as I0 cm. in diameter; consisting of zooecia laying parallel and 
closely adjacent in one plane and radiating in branches from a 
coinmon centre. 
Zooecia entirely recumbent, narrow, elongate, with the orifice 
opening almost vertically ; the proximal part a little flattened, 
without dorsal keel or furrow: the ectocyst densely covered with 
minute sand-grains, translucent brownish, indistinctly annulated, 
paler on the distal than on the proximal part. 
Polypide not observed. 
Statoblasts.-—Only fixed statoblasts are apparently developed. 
They occur in great profusion, entirely filling many dead zooecia 
and arranged in moniliform series. As the dorsal wall of the 
zooecium decays they are left adhering with its ventral wall to the 
host’s carapace and reproduce the pattern of the zooecium, often 
almost completely. They are, as arule, broadly oval, measuring 
about 0°52 X 0°35 mm., but sometimes they are circular and 
occasionally kidney-shaped. ‘The surface is polished and without 
a trace of reticulation and the capsule is surrounded by a stout 
chitinous ring separated from it by a deep peripheral groove; the 
colour is black or very dark brown. 
Localities and hosts.—R. Ganges near Rajmahal, on carapace 
of Hardella thurgii, Kachuga dhongoka and K. lineata: staloblasts 
also observed on young specimens of K. dhongoka from Allahabad 
and Fatteghar. 
The structure of the zooecium closely resembles that of the 
zooecia of some forms of Plumatella tanganyikae, which I have 
recently adopted as the type-species of the new subgenus 
Afrindella (Rec. Ind. Mus., vii, p. 140) and I have little doubt that 
I am right in referring the new species to that subgenus. It is 
unfortunate, however, that the polypides of the type-specimens 
are not ina fit state for examination. ‘The statoblasts somewhat 
