THE NAUTILUS. 11 



From the inlet at the northeast of Square Lake, the east side was 

 followed to the south, a distance of about 8 miles. The wind blow- 

 ing prevented us from doing any dredging, and the bottom is gener- 

 ally stone. 



In the south end of the lake the bottom is covered with fine sand 

 and afforded very fine dredging ground for 2 or 3 square miles. 

 From the shore to 10 feet deep Pomatiopsis cincinnatiensis was very 

 common, and a few specimens of Pisidium were found from 10 to 

 25 feet. Valvata tricarinata and V. sincera were found, but beyond 

 the depth of 25 feet all the shells seemed to disappear, and the 

 dredge was filled with nothing to collect. The western shore of the 

 lake is rocky and the only place visited is Limekiln Point, where I 

 have spent a good deal of time in past years. This very interesting 

 locality of the Upper Silurian limestone of the Lower Helderberg 

 group, contains many fine specimens of fossils, many of them pecu- 

 liar to this locality. A very fine collection has been found at this 

 place. * * * From Limekiln Point to Eagle Lake every part 

 was carefully surveyed, yet nothing of special interest appeared. 

 Eagle Lake is the longest of Aroostook Lakes, being about 18 miles 

 long and 1 wide. In one place I could not reach bottom with a 

 100 foot line. 



Along the north shore I obtained the same species as I found in 

 Cross and Square Lakes, and from the deep water I obtained only 

 rocks and gravel, and not a fragment of a shell. Where the south 

 branch of Fish River enters Eagle Lake, in a sand bar, a lot of fine 

 living specimens of Sphcerium striatinum Lamk., and Margaritana 

 undulata were collected. Throughout the thoroughfare to Portage 

 Lake Sphcerium striatinum is plentiful. * * * * 'Nothing new 

 was added. A good deal of hard work was done dragging the boat 

 through the rapids and over rocks and ledges to Portage Lake. 



Portage Lake is in parts surrounded by high hills and a very at- 

 tractive place for tourists. The western part is a good finding 

 place for mollusks. Pomatiopsis cincinnatiensis Lea, is obtained 

 somewhat larger in size as it approaches deep water ; Planorbis 

 companulatus and P. bicarinatus are also of large size, and the 

 angles of the whorls in bicarinatus are very sharp. Planorbis de- 

 flectus is found at the bend of the lake, very large, from 8 to 9 mm. ; 

 Valvata tricarinata and V. sincera are also of good size. 



Near the south and east corner of the lake a colony of good, large 

 specimens of Campeloma decisum in 6 inches of water were found. This 



