52 Records of the Indian Museum. [VoL. V, 
anntlated ectocyst, while it may be at once separated from P. 
philippinensis by the fact that the latter’s zececia are smooth and 
polished and show no trace of annulation. 
Habitat. As yet only known from Igatpuri Lake, which is 
situated in the Western Ghats about 60 miles N. E. of the island of 
Bombay at an altitude of about 2,000 feet. 
Habits. I found this species common in the lake in November, 
1907 and 1909. The largest zoaria were growing on the lower sur- 
face of stones, but a few were found attached to the stems and leaves 
of water-plants. The latter, however, did not appear to be in a 
very flourishing condition and were all small; their pigmentation 
was not so dense as that of the colonies on the stones. Probably 
P. bombayensis is a species that flourishes during the “‘ rains,’ 
for even the most vigorous colonies appeared, in November, to be 
dying ; there were patches among them in which the polypides had 
disappeared from the zoaria, and sometimes the zoaria had decayed, 
leaving the fixed statoblasts to mark their former position. 
c. Punctata group. 
This group comprises Jullien’s genus Hvalinella (1893) and 
probably consists of a single species. 
. 
Plumatella punctata, Hancock. 
Plumatella punctata, Hancock, Ann. Mag. Nat. Hist. (2), vol. v, 
Pp. 200 np wv hes: 6, 7 and pl. ii, fig. I. 
Plumatella punctata, Allman , Op. cit. , p. 100. 
,, Kraepelin, Deutsch. Stisswass. -Bryoz oen., p. 126, 
pl. 1V , figs. TES, ION ply, hes. 124 195: pl. vii, figs. 153, 154. 
The most striking character of this species is the nature of the 
syneecium. Although the zocecia retain their tubular nature to a 
very considerable extent, the ectocyst is so soft and as a rule so 
much inflated that this character of the zocecia is masked, and 
frequently the zoarium appears to represent an almost uniform flat 
area rather than a branching structure. The movements of the 
polypides, moreover, affect the ectocyst directly, and it is drawn 
together by the contraction of the muscles in a way that does not 
occur in other species of the genus. There is therefore no difficulty 
in recognizing living specimens ; but preserved ones are often apt 
to be confused with P. repens. The statoblasts are, however, 
often even broader than is the case in that species, and even in 
badly shrunken specimens the ectocyst is always thicker. The 
zocecia are colourless or nearly so, either hyaline or translucent. 
In Europe Kraepelin has recognized two seasonal forms as 
varieties under the names prostrata and densa, the former being 
found in summer, the latter in autumn. In var. rostrata the 
zocecia are elongated and entirely hyaline, with the external sur- 
face nearly smooth, whereas in var. densa they are much stouter 
