SPONGES Oo 
grow for ashort distance, thus ensuring a greater surface of attachment. But 
as I have never succeeded in finding a case where this growth continued en- 
tirely beyond the point of Jointure, it is probable that the horny matter, secreted 
by the sarcode upon both the old branch and the new twig, especially the 
former, soon closed the open tip of the new twig, thus preventing further 
growth. 
S 
LK QS 
OOO NSA 
aca ASS ; 
4 1S ¢ 4 
z/ An LOA <<< 
aT a 
et Sponge. 
» 
Giant Cup Sponge. 
In Fig. 16,at D, IF, and I, 1 give four methods of this kind of anesto- 
mosis when new twigs have come in centact with the old (in all of these fie- 
ures, ais the old giowth and c the new ) all at different angles. In that at 
D, c, c, the new growth came upon the old branch obliquely, grew slightly 
