Invertebrate Animals of Pas samaquoddy Pay. 95 
As is well known to you, these animals move by the rapid con- 
traction and slow expansion of the disc. At Campobello I had the 
good fortune to see the mmthod by which they can move backward. 
Going along at a rapid rate, and not possessing the sense of sight, 
one of them suddenly ran into one of the logs of a wharf. Stopping 
for a moment, and there being no current to carry it off, it began to 
move backward by contracting its disc, so that it extended as far as 
possible in the direction in which it wished to go, and then by a 
quick contraction of the edge drew itself backward, partially turning 
as it did so by contracting more on one side than the other, until it 
was clear of the obstruction, when it resumed its normal method of 
progression. 
Around Pendleton’s Island there is occasionally found the 
Ptychogena lactea., looking like a white cross on the water. The 
common sea-anemone {Metridium marginatum) occurs at Craig’s 
Ledges, together with some other species, while many species as yet 
undetermined, of bryozoa, annelids, small Crustacea, sertularians, 
etc., are abundant throughout the Bay. 
In considering the Zoology of the Bay as a whole, it may be said 
that it is extremely rich in animal life, and more especially in the 
Mollusca, for which reason, as also on account of their greater prac- 
tical importance, I have devoted more attention to them in this paper 
than to the Articulates and Radiates. The Bay affords an inexhaust- 
able supply of food-molluscs, the chief reason for their non-utilization 
at. present being that the cod, pollock, herring and other fish are still 
so abundant, while the cultivation of the land is very far from having 
readied that point at w'hich the price of grain is raised because the 
people cannot produce enough for their own subsistence. Owing to 
the non-enforcement of the law relating to the matter, our only 
edible articulate, the lobster, is steadily decreasing both in numbers 
and size. Thus much for the practical aspect. To the naturalist the 
Bay affords a rich field for investigation, far the greater part of it 
being still unexarnined, my own work having been almost exclusively 
in the upper part, while the whole extent from St. Andrews to Perry, 
embracing all that part between Deer Island and the mainland of 
Washington County, Maine, has never, so far as I have been able to 
learn, been dredged by any naturalist whatever. The best collecting 
ground in the Bay is at Craig’s Ledges. At this point there is a nar- 
row channel through which Chamcook harbor is filled and emptied. 
