457 
a future paper to have the opportunity of taking the question up 
again in dealing with sponges collected by Dr. Th. Mortensen 
in the Australian seas). It is very interesting that the tetrapocilli 
are found as foreign bodies in several sponges from the locality: 
2 miles E. of North Cape, N. Z. 1915. 
Tetvapocillon novae=zealandiae nov. spec. 
(Fig. 15 a-f.) 
Slipper Isl. The coast, at low water. 20/XII.1914. 
One fragment; seems to have been enerusting and then torn 
loose from the body of attachment; it is forming a cake-like expan- 
Fig. 15. Tetrapocillon novae-zealandiae nov. spec. 
a. Styli. h—e. Tetrapocilli. f. Isochelae. 
sion, ca. 3 mm thick, 30 mm and 25 mm in the other dimensions. 
Consistence like felt. Surface finely granular. Colour black, though 
the interior of the sponge light grey. Some few openings, ca. 0,8 
