50. 
S.A. tfAT., V>OL. XVl. 
March 24, 1937. 
Life at the Edge of the Sea. 
If a little sand is dropped in the dish, the reason for the 
sudden diving of the Exoediceros is seen, the dive from the sur- 
face film with the long legs trailing behind is almost instantaneous 
and they are buried before the Urohaustorius have properly 
investigated their new home. In a short time all that is seen is 
sea-water and sand. 
Fig. 
Urohaustorius halei Sheard. (After Sheard). 
Leaving the spade on the shore, you wade across the Horm- 
osira to the rock pools. Here the bucket is filled with about 
three gallons of water to which about half a pint of formalin 
has been added, and into this alga-covered stones from the root 
pools are placed. First, the Marine Worms pour from their 
tubes and crevices, followed by Amphipods, Isopods, Cumacea 
and larger Crustacea until, after about twenty minutes, these 
rocks are washed well, taken out, and replaced by others. When 
sufficient have been soaked, the water is strained through the 
butter cloth and the specimens straight-way transferred to spirit 
for future examination. 
Seaweed may be treated in the same manner, clouds ofisma 
Crustacea crowding out from their home. Many of these fo 
are little known and present many problems to the zoologis . 
In these weeds primitive, leaf-like Amphipods, the A 
accompany their more specialised cousins, the Caprelhds, 
skeletons which successfully imitate the seaweeH strands > 
Pvcnogonida, whose eight legs and small bo y a 
