16 Shells as evidence of the Migrations. 
condition and associated with other edible kinds, bones 
of animals, stone implements, and flint flakes, have since 
been noticed by several observers round the Donegal coast 
in sites similar to those at Dogs Bay. 
Regarding the Dogs Bay discovery, F. J. Bigger, one 
of the 1895 party, writes: “Shells of this species, either 
whole or broken, had seldom been observed among other 
remains in sandhills, and certainly never in any quantity ; 
but here there was a large heap, all broken, which seemed 
to have the same connection with the sites as the shells of 
the other species.” 
Inquires were made in the neighbourhood as _ to 
whether the ?uzfura was now used for any purpose, but 
not even the oldest inhabitant could recollect hearing of 
its being used as food, or bait, or in any way whatever. 
Large quantities of broken shells of Purpura laptllus, 
together with rounded pebbles of quartz, large enough 
to break them, have also been found by the Rev. K. 
Ashington Bullen in “ Kitchen-middens,” close to the 
Late-Celtic cemetery, at Harlyn Bay, North Cornwall. © 
These discoveries of broken Purpura shells in the 
British Isles have led to much discussion as to the possi- 
bility of their use as food like the other associated species. 
This question, however, has been ably dealt with by 
Standen and Bigger, who point out the unsuitability of 
this species either for food or bait, whereas the associated 
species, Patella and Littorina, may be used for either 
purpose. They suggest, therefore, that the Purpura shells 
may have been broken in order to extract the animal for 
the rich purple it affords. A similar suggestion is put 
forward by the Rev. Kk. Ashington Bullen,” 
*! Proc. Roy. Lrish Academy, 3rd Ser., ¥.5 1899, ps 437- 
©? Proc, Malac. Soc., V¥., 1902, p. 185, and Zrans. S. Eastern Unton 
of Sct. Soc., 1903. 
©8 Jind, 
