SPONGES OR PORIFERA 29 
The Finger Sponge, (Chalina oeulata, Fig. 6), is dull red or 
yellow in color and grows upon rocks or shells, forming finger- 
shaped masses about six inches high. At intervals there are large 
openings on the sides of the sponge which serve to allow the escape 
of water from the interior. This sponge is common north of 
Cape Cod at depths greater than fifteen: feet. 
The Sulphur Sponge, (Suberites compacta,), is a compact, heavy 
sponge which grows on sandy bottoms off the Long Island coast. 
When living it is bright yellow, but soon 
darkens into an ugly brown after death. 
The surface of the sponge is smooth, rounded 
and nodular. 
The Urn Sponge, (Grantia ciliata, Fig. 
7 ), is common in tide pools on Long Island 
where it grows in clusters of little urn-shaped 
sponges, each urn being dull yellow, gray 
or drab in color, about one-half of an inch 
high, and with a large opening edged with 
spicules at the summit. It is found along Fig. 7; URN SPONGE, 
our coast northward to Greenland, and is Crane 
abundant on the northern coasts of Europe. Water is constantly 
being drawn in through sieve-like openings on the sides of the 
sponge and forced out through the large terminal opening. 
