Occasional Papers of the Museum of Zoology 21 



RIVERS (TABLE iv) 



Sturgeon River 



Habitat 2p. Rock Dmn in the West Branch. About two 

 miles above the two branches of the Sturgeon the West Branch 

 flows across an outcropping ridge of much contorted, tilted 

 and laminated schist. i\bove the small falls at the downstream 

 edge of the outcrop, the water was about four feet deep in 

 the center of the stream and the current very swift, but in 

 shallow water along the shore the rocks were covered with a 

 thin layer of organic material and sand. 



Habitat 30. Falls of the Sturgeon. Some distance above 

 Loretto the Sturgeon River flows through a gorge, as described 

 in the general discussion. Here the current is very swift and 

 there are several small falls. The shells were collected along 

 the edge, where sand had been deposited in the quieter back- 

 waters. 



Habitat 31. Below the Lumbering Dam. About two miles 

 below the forking of the Sturgeon a lumbering dam had been 

 built for the purpose of maintaining a good head of water. 

 Below this the water was shallow, with a swift current. Along 

 the shore, in from 4 to 12 inches of water, the bottom was of 

 sandy clay, and here most of the smaller shells were obtained. 



