26 SPONGES 
small mesh in the net-work of fiber. while the other may grow toa greater 
length, and then anastomosing, form a larger mesh, ( see Fig. 14, K and 8. 
where I give a life-size section of the growing skeleton of ‘Tube Sponge, and the 
different sizes of the mesh of the net-work may be seen ) consequently this 
forms an irregular anastomosis, 
Fig. 1k. 
Pca 
{ 
P \ . 1 : 
1m) i, ae 4 It 
y JSS ere NN sate I 
yy, \\e \ | CF 
Pf e) \\k \\ Lr \ 
iL’ \ | hess AAs 
\ es \ 
A B Cc 
Illustrating the anastomosing and twig Illustrating arrested and ab- 
division of the fiber of Tube Sponge. B,a, divi- normal growth of the fiber of 
sion of twig. C, a, new twig before dividing. ‘Tube Sponge. C, arrested 
0, 0,0, in allis the anastomosing point. growth. A, B, abnormal 
vrowth,. 
As the direction assumed by a new twig Is rarely the same as that taken 
by the one immediately behind it, sometimes the new twig comes in contact 
with the thick skin covering the outer surface of the sponge or with the lining: 
