
No. 426.] SAGARTIA LUCIA VERRILL. 493 
I think, beyond a doubt that the species has migrated eastward 
from New Haven and northward to Salem, having covered the 
distance between these two extremes probably within ten years. 
As this actinian is remarkably hardy, thriving well in high tidal 
pools where the water is often temporarily much diluted and 
very variable in temperature, it is unlikely that the change 
from the warmer waters south of Cape Cod to the colder ones 
north of that point will noticeably retard its dispersal. Like the 
introduced periwinkle, Littorina littorea (see Bumpus, '98), this 
species will probably gain an extended distribution both north 
and south of Cape Cod, though in this instance the invasion 
comes from the south instead of from the north, as with the 
periwinkle. It is hoped that these notes will call the attention 
of observers to S. /uciæ, so that definite information may be 
obtained as to its present distribution, both north and south, 
and likewise evidence of its further dispersal. 

LIST OF REFERENCES. 
Bumpus, H. C. 
'98. The Variations and Mutations of the ‘Introduced Littorina. Zod. 
Bull. Vol. i, pp. 247-260. 
KINGSLEY, J. S. 
‘Ol. Preliminary Catalogue of the Marine Invertebrates of Casco Bay, 
Me. Proceedings of the Portland Society of Natural History. 
Vol. ii, pp. 159-183. 
VERRILL, A. E. 
'98. Descriptions of New American Actinians, with Critical Notes on 
ther Species, I. Amer. Journ. of Sci. Ser. 4, Vol vi, 
PP- 493-499. 
