443 
dragmata, also lie packed close together in the septa, which divide 
the several subcortical crypts from one another. 
The skeleton of the cloacal tube consists of an axis composed of 
shafts of stout orthodiaenes and 
orthodiaenes projects vertically 
outwards from the axis; they 
are placed in stories in the same 
plane, one above another, con- 
nected with thin lamellae of or- 
ganic tissues, thus building septa 
dividing the entire cloacal tube 
into 4—6 canals; the outer walls 
of these canals are made up of 
a dermal-membrane suspended 
between the apices of the over- 
grown cladi of the orthodiaenes 
from row to row; the dermal- 
membrane and the lamellae 
separating the clocal canals are 
sustained by microscleres. The 
cloacal canals are only prolonged 
a few mm into the sponge-body, 
they are here in connection with 
numerous finer canals lying in 
the sponge-body itself. 
Spicules. 1. Orthotriaenes 
(fig. 4a), in the main body; shaft 
straight or slightly bent near the 
base, evenly tapering to the 
sharp-pointed apex up to 4000 
X 60 fi; cladi straight or a little 
upwards curved; width of cla- 
dome about 430 /t. 2. Orthodiaenes (fig. 4b) of the cloacal 
tube; shaft straight, up to 4500 x 45 thickest near the base. 
Fig. 4. Monosy ringa Mortenseni nov. S])ec. 
a. Orthotriaenes. h. Orthodiaenes. c. Or- 
thomonaene. d. Oxeote. e. Oxyasters. f. ('.hi¬ 
asters. g. Trichodragniata. 
tapering evenly to the very sharp-pointed apex; the stronger cladus 
is a little backwards curved, nearly as thick as the shaft, tapering 
to a fine point, up to 1700 p in length; the other cladus is inserted 
