THE NAUTILUS. 141 
In July, my husband (who shares my studies with me) and I 
went up the river to a rocky point a short distance beyond the place 
where I found the Skeneas and here we tried our hand-net. Our 
efforts were rewarded by alive Lyonsia hyalina Conr, Our surprise 
and delight were unbounded. Never before had we even thought 
of Lyonsia as living so far from the sea (15 miles or more), and on 
a muddy bottom. This added another species to the many we had 
already found in this river. Repeated dredgings with the hand-net 
brought us no more Lyonsias, but on a careful examination of a 
small patch of mud at low water mark, covered with a hairy green 
sea-weed we discovered the hiding place of the fragile Haminea 
solitaria Say, and our diligent search resulted in our finding six of 
these transparent dainty shells. These the first we ever found alive, 
although in the bay at the headwaters of the river two miles away, I 
have found quantities of the deed shells. I am not aware that 
Haminea solitaria has ever before been found in Maine. It is a 
southern species and is not found in boreal waters. Its presence 
here along with several other distinctively southern species is 
regarded as evidence that the water bathing the coast of Maine was 
once much warmer than now, and these mollusks are the survivors 
of a fauna now nearly extinct in Maine. 
On another trip, a short distance down the river, our net brought 
up a dead shell of Nassa trivittata Say. 
Asa result of this Summer’s work along the salt water I have 
added four species to my list of Damariscotta River shells: Lyonsia 
hyalina Cour., Aemea testudinalis Mill, Skenea planorbis Fabr. and 
Nassa trivittata Say. 
But the river banks are not the only localities in this vicinity rich 
in molluscan treasures. On a trip to a brook in South Newcastle 
we found forty-one specimens of Margaritana arcuata Barnes. A 
second visit to the same locality gave more Margaritanas, Spherium 
partumeium Say, Ancylus rivularis Say, and one Limnea which 
I have not yet determined. While waiting for our train we found 
a number of fossil shells in clay which had been unearthed by men 
who had been getting gravel for the railroads. The shells found in 
this clay were all bivalves, and did not seem to be at all like the 
shells common to this period or locality. One shell somewhat re- 
sembled Lyonsia hyalina but it had numerous teeth in the hinge 
like the Arca. 
