1919. | N. ANNANDALE: Sponges, Hydrozoa and Polyzoa. 93 
0°77 mm. in diameter and not longer than 255 mm. In the 
denser parts of the colony they are often bent or twisted in their 
long axis. The proximal region of each zooecium is brownish, 
smooth or irregularly annulated and translucent, the softer distal 
region colourless, transversely wrinkled when the polypide is retrac- 
ted and transparent in fresh specimens. In degenerate colonies 
this region disappears with the polypides, but in living areas it is 
of relatively large extent. 
The polypides are nearly colourless throughout. I have not 
been able to detect any distinctive feature in their anatomy. 
The statoblasts are of the elongate type. Those of the free 
kind are from 14 times to over twice as long as broad. ‘They have 
the sides nearly parallel and the ends broadly rounded. The ring 
of air cells is narrow and not much broader at the ends than at the 
sides. It encroaches little on either surface. ‘These statoblasts 
are somewhat curved in their long axis. The fixed statoblasts 
resemble the free ones in shape, but are larger and usually broader 
and more variable in outline. They are very flat but slightly con- 
vex on the dorsal surface, black, smooth and polished. Each is 
surrounded by a delicate peripheral crenulate carina separated 
from the body of the statoblast by a deep but narrow groove. 
Both kinds of statoblast are large compared with the calibre of 
the zooecium. 
Measurements of statoblasts (tn millimetres). 
Free. Fixed. 
Length oP, .. 0°289-0°374 0°34-0°544 
Breadth xe te Orl7-0: 204 0°255-0°272 
Type-specimen. P. 2 Z.S.1. (Ind. Mus.). 
Locality, etc.—Our specimens were found at the bottom of a 
pool of very foul water in the nearly dry bed of the Randa stream 
near Jellalabad, Seistan. They coated the peculiar nodular roots 
and the stems of some plant which grew in the mud but had died 
down completely in winter. 
Subgenus Hyalinella, Jullien. 
1885. Hyalinella, Jullien, Bull. Soc. zool. France V, p. 133. 
1910. Hyalinella, Loppens, Ann. Brol. Lacustre, 1V, p. 147. 
1git. Australella, Annandale, Faun. Brit. Ind., Freshw. Sponges, etc., 
4 PA 6 
19tt. Plumatella (in part), td., ibid., p.212. 
1914. Australella, Kraepelin in Michaelsen’s, Lauwd-u. Siisswass. Fauna 
Deutsch-Sudwestafrikas, X1, p. 61. 
1916. Australella, Annandale, Rec. Ind. Mus. XI, p. 163. 
The one diagnostic feature of this subgenus is that the 
true ectocyst is transformed into a gelatinous layer, which may be 
so thick as to produce a synoecium analogous to that of the Lopho- 
podinae. The growth, however, is always dendritic, and the tent- 
acles never of great length. Until now no fixed statoblasts have 
