176 
GAMMARlDiE. 
found in close proximity to the broad form previ- 
ously described [made by S 'ulcator] ; but occasionally it 
occurs high up on the beach, and in pools and small 
hollows between the ripple-ridges. In such situations, 
however, it is not confined to the bottoms of the hol- 
lows, but likewise passes up the sides of the bordering 
ridges.” 
We have also received a specimen from Mr. Robertson, 
of Glasgow, which was taken by him at Cumbrae, N. B. 
The vignette below is the sketch of Whitburn sands 
alluded to in the preceding page. 
