HYALONEMA (PRIONEMA) AGUJANUM. 
253 
GASTRAL AND DERMAL PINULES OF HYALONEMA (PRIONEMA) AGUJANUM. 
Distal ray 
Lateral rays 
length 
basal 
thickness 
M 
maximum 
thickness, to- 
gether with 
the spines 
. h 
length 
n 
var. 
tenuis 
form 
A 
dermal 
pinules 
from the 
basal part of 
the sponge 
123-258 
8-12 
28-35 
42-52 
from the 
middle and 
upper part 
of the 
sponge 
200-311 
8-10 
30-37 
36-48 
gastral pinules 
251-300 
9-11 
30-39 
40-52 
dermal and gastral 
pinules 
123-300 
8-12 
28-39 
36-52 
form B 1 
dermal and gastral 
pinules 
225-311 
7-10 
18-30 
37-45 
var. lata 
dermal pinules 
218-302 
7-11 
22-36 
32-57 
gastral pinules 
215-300 
7-13 
25-38 
30-50 
dermal and gastral 
pinules 
215-302 
7-13 
22-38 
30-57 
Besides the dermal and the gastral pinules described above, a considerable 
number of other pinules were found adhering to the surface or embedded in the 
superficial parts of the sponge. Some of these have long and bushy distal, and 
very short lateral rays. In others the distal rays are cpiite short and very 
slender and the laterals long. The former, which are quite frequent, resemble 
the pinules of Hyalonema tenuifusum and probably belong to that sponge, which 
was trawled at the same station; I accordingly consider them as foreign. The 
latter are rare. They may be proper to the sponge and would, in that case, 
have to be considered as transitions between the dermal pinules and the rnicro- 
hexactines. Dermal transitional pinules, if such, have been found in both forms 
of var. tenuis and in var. lata. The dimensions of the few observed are: — 
1 The single specimen of var. tenuis form B is not sufficiently well-preserved for a reliable distinction 
between dermal and gastral pinules; hence special measurements are not given. 
