88 Records of the Indian Museum. [Vor. XVIII, 
spicules are well-developed and normal in appearance. A few are 
scattered in the parenchyma. ‘The shafts are stout and as a rule 
considerably longer than a single rotule, with the spines upon 
them by no means strongly developed. ‘The rotules are deeply but 
irregularly divided, their denticulations having the form of flattened 
spines more or less welded together at the base but without any trace 
of webbing. The gemmules are small and somewhat depressed. 
Their pneumatic layer is thin and they bear a single layer of spicules. 
These specimens are from station 21 of our expedition. I give 
with their measurements those of specimens from station 20, which 
I will describe, for comparison. 
4 \ [ 
i | | : 
B. 
Fic. 3.—Spicules of Ephydatia fluviatilis from the Hamun-i-Helmand, 
x 250. A=spicules of specimens from the lower surface of a block of clay at 
the edge of the lake. B= spicules of a specimen from the stem of a bulrush in 
a reed-bed. 
Measurements of spicules, etc. 
Stas 20: Stasi2r. 
Length of normal skeleton- 
spicules »- 0°246-0°328 mm. 0°2624-3075 mm. 
Maximum breadth of normal 
skeleton-spicules .. 0°006-0°025 __,, 0°0123-0°01435 ,, 
Length of normal 
gemmule-spicule .. 0°020-0'0369__,, 0°0287-0'0369_,, 
Diameter of rotule 0'016-0°0240 _,, 0°0246-0°0328 _,, 
Diameter of gemmule 0°340-0°375__,, 0°345-0°359 ” 
