THE MYSIDJE OF CULLERCOATS. 
13 v A. MEEK, M.Sc. 
The following notes refer for the most part to observations made 
this year at Cullercoats, but records are also given from other 
localities on the coast of Northumberland. 
Cullercoats harbour may be said to be rich at least in individuals 
of this family. During the summer a short haul with a bottom net 
will furnish some f>0 — 100 specimens, young and adult. By far 
the most common is Macromysis inermis : but a fair proportion ot 
Macromysis rle.ruosa and Siriella armcita is to be found together with 
smaller numbers of the other species about to be mentioned. M. 
jle.niosa of course occurs plentifully in the upper rock pools, and at 
the upper edge of the harbour. 
By “the harbour” is meant the natural channel between the 
rocks and beyond the piers. Here the boats are moored when the 
weather permits, but opening as it does, without any shelter, to the 
sea, the harbour is liable to recurrent and often heavy easterly 
swells. It only measures about 1*20 yards across, and its length may 
be said to be about 250 yards. The rocks on each side are covered 
by a fathom to two fathoms of water at high tide, and the depth in 
the harbour at low water is about 5 feet on the average, and at high 
water some 20 — 25 feet. A small portion of the bottom next the 
piers is exposed during spring tides. The bottom consists of sand 
and mud with rocks and stones bearing laminaria, Ac. 
The temperature and density are therefore very much like the 
water outside. The former ranged this summer from 45 — 17 F. 
in April, to 5G — GO in July and August. The density was very 
uniform, varying between 1021 — 1025 us a rule. 
