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 a live 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 Haminen 

 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. 



As a result of this Summer's work along the salt water I have 

 added four species to my list of Damariscotta River shells : Lyonsia 

 hyalina Conr., Aemcea testudinalis Miill, Skenea planorbis Fabr. and 

 Nassa trivittata Say. 



But the river banks are not the only localities in this vicinity rich 

 in molltiscan treasures. On a trip to a brook in South Newcastle 

 we found forty-one specimens of Manjaritana urcuata Barnes. A 

 second visit to the same locality gave more Margaritanas, tijilia-rium 

 partumeium Say, Ancyltis rivularis Say, and one Limncea 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 Area. 



