20 SPONGES 
half way up the side. Upon examination I find that the sponge has been 
injured, two holes having been bioken into its side near the base, admitting 
sand, with which the tube has been completely filled. A section shows that a 
partition has been formed above the sand ; thus the bud has originated at what 
is really the base of the cylinder.. (See Fig 11, B shows the cylinder, with 
the hole at d, filled with sand: tT, is the tube; a, the partition; c, the bud. 
On account of this abnormal growth, the tube of the cyl nder is slightly 
Bio. diy Fig. 12. 
N MELINA? 
Ulustrating abnormal budding of Tube A, normal filament of Filamen- 
Sponge: A, bud, lie size; c, walls of tous Sponge; B, unusual filament 
parent tube; b, parent tube, reduced of Tube Sponge. | 
size; e, bud; a, partition; d, broken 
area; T, tube in both. 
coatracted at its termiaation. The bud is given at A, life size, and the relation 
of its tube, 1, with the walls of the parent cylinder,'c, may be seen. This bud 
had the closing membrane quite well developed. 
