MUSSELS OF CUMBEELAND EIVER AND TEIBUTAEIES, 



37 



slips that occur along the banks, when great masses of earth slide 

 into the water, sometimes carrying trees with them. 



At Jones Landing there was another clammers' camp, operated by 

 a Mr. Scarborough, who rendered us considerable assistance. The 

 water here was 15 feet deep and the current about 3 miles an hour 

 over a bottom of mud and gravel. Sixteen hauls were made here, 

 with the following results: 



Hauls Made at Jones Landing. 



a No mussels taken. 



At Three Sisters Springs, near Linton, Ky., some remarkably 

 large springs flow out of a cave into the river. There was a current 

 of 4 miles an hour in water 20 feet deep over a bottom of soft gravel. 

 No parasites were found except distomid cysts along the margin 

 of the mantle of a few shells. Stained and rough t^ps, which in 

 some places indicate pearl formation, were common in the shells 

 here. Six of the pigtoes had the lower half of the outer gills filled 

 with glochidia (May 24). All the mussels examined had their intes- 

 tines filled with greenish mud and appeared well fed. 



The main bed is a little below the springs and had been worked 

 for four seasons. Our helper, who had been a professional clammer, 

 had on one occasion dug in this bed 13 boxes of shells of 100 pounds 

 per box m one day. This was in competition with another man 

 who dug 12 boxes in the same time — a ton and a quarter by the two 

 men in a single day. 



Below Linton shell beds are common but none were being worked 

 above the mouth of Donelsons CreeJv. The largest of these beds is 

 at Dead Mans Bar, where there was a large pile of culls near the 

 mouth of Terrapin Creek. 



At Donelsons Creek a clammer had just begun working and had 

 only a few shells, chiefly pigtoes, washboards, niggerheads, and 



