1915. ] N. ANNANDALE : Parasitic Sponges. 469 
larger amphioxi in shape and proportions, but the latter are usually 
straight or nearly so. 
Schizotype.—No. 6597/7 ZEV, Ind. Mus. (dried specimen). 
Spicules of Clzona often occur in the parenchyma and films of 
Chondrilla sometimes envelop the basal branches. 
var. digitifera, nov. 
1913. Spongosorites sp., Sewell, Fourn. As. Soc. Bengal (n.s.) IX, 
P+ 340. 
I have had by me for some years a sponge that I identified 
provisionally for Capt. Sewell as 
a new species of Spongosorites. 
A comparison with Carter’s 
A. excavans shows an absolute 
identity of skeletal structure, 
though the external form is 
very different and slight differ- 
ences in spiculation can be 
detected. I propose therefore 
to regard this sponge as a 
variety of A. excavans, of which 
it may be no more than a 
growth-phase. 
The sponge consists of a 
number of short, pointed, some- 
what compressed upright 
branches of rather irregular 
outline, united by means of a 
crust in which are embedded 
numerous small stones (non- 
calcareous) and dead shells of 
Lamellibranchs and Balanidae. 
The longest branches are about 
30 mm. long and about 14 mm. 
broad at the broadest point; 
their thickness is about 7 mm. 
The shortest axis is directed 
towards the centre of the mass. 
The whole specimen is about 
100 mm. long by 40 mm. broad, 
but has probably formed part 
of a larger mass. In spirit the 
colour is dirty white. The 
sponge is rather hard but can 
be torn easily. 
The external surface is in 
Biases obscurely and minutely ote, 5 Yi en en 
reticulate, elsewhere distinctly ~“°°'" Sita, 
By v5 ? Amorphinopsis excavans var. digitifera 
hispid. No external orifices (enlarged). 
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