292 
Transactions of the Society. 
The first impression was that these projecting tubes were ex- 
traneous growths, and they look much like the cases of Hydrozoa ; 
but a study of the sections shows the definite way in which they grow 
from certain parts of the zoarium ; but what the function may he there 
is little to guide us. We must, however, ask if this can be a primitive 
form of avicularium ; that is to say, have we here a structure main- 
taining direct contact with the sea even when the polypides have 
disappeared ? Another question has suggested itself : Must they he 
compared with the nematocalyx of the Hydrozoa ? but nothing is seen 
to support this. 
There is one distal rosette plate and a double row of lateral plates, 
making four to each side, and it will he seen that in the position of 
the rosette plates, as well as in the projecting tubes and other 
characters, there is so much variation from known Fiustrse that its 
ultimate removal from this genus is most probable. 
Tentacles 19. 
