112 SEA-SHORE LIFE 
time within hydroids, forming gall-like swellings. The legs are 
often sufficiently translucent to permit one to observe the wave-like 
contraction of the stomach-tubes within them. 
An excellent account, accompanied by good figures of the sea 
spiders of our coast, is given by Edmund B. Wilson in the ‘Report 
of the United States Fish Commission” for 1878; and in “'Trans- 
actions of the Connecticut Academy of Science,” Vol. V. 
