10 MUSSELS OP BIG BUFFALO FORK OF WHITE RIVER. 



which he would come to the surface, take a breath, and disappear 

 again under water. During the week he had taken out of this bed 

 about 10 bushels of shells, but did not believe many were left. From 

 this bed a series was selected by Mr. Cookson and common names 

 known to him were given them. Pearls, he says, are found mostly in 

 the red and green muggets (muckets) and the washboards, and these 

 shells are usually the most abundant. All shells taken, however, are 

 opened for pearls. Mr. Cookson had hunted pearls for several years. 

 He reported finding on an average pearls to the value of about $300 

 each year. The most valuable one found by him sold for $90. 



Shells found at station 15: Red niggerhead, Quadrula tubercidata^ 

 common; white niggerhead, Q. eocc'mea, scarce; cob shell, rabbit's 

 foot, Q. cylindrical common; rock mussel, washboard, Q. undulata, 

 common; ZJnio gihhos-us; niggertoe, Alasrnidonta truncaia; sand mus- 

 sel, Symphynota costata; j^oung fantail, Cyprogenia aberti; fantail, 

 Tritogonia tuherculata; red shell, Lampsilis jmrpuratus ; L. ozarhen- 

 sis,' spectacle case, L. rectus; red mugget, green mugget, grass mucket, 

 L. ligamentinus; L. hrevicidus hiittsi. 



Station 16. — August 2. About 3 miles below camp K (Cookson's 

 camp) a collection was made from a bed about the size of the one 

 mentioned above. 



Shells found at station 16: White niggerhead, Quadrula coccinea, 

 scarce; cob shell, rabbit's foot, Q. cylindricaj common; rock mussel, 

 washboard, Q. undulata^ more abundant than all other species; TJnlo 

 gibhosus^ scarce; sand mussel, Symphynota costata, common; fan- 

 tail, Tritogonia tuhercidata, scarce ; young fantail, Cyprogenia aherti, 

 scarce; red shell, Lampsilis purpuratus, scarce; Z. glans, 1 specimen; 

 Z. ozarkensis, common; spectacle case, Z. rectus; Z. venustus, scarce; 

 green mugget, red mugget, grass mucket, Z. ligamentinus, abundant ; 

 butterfl}", Z. ventricosus. 



Statio7i 17. — August 2. About 5 or 6 miles below Cookson's camp 

 a small bed was found and from it a collection was made. In the 

 next mile two other very small beds were observed at the head of 

 shoals in very rocky places. No collections were made from these 

 beds. 



Shells found at station 17 : Red niggerhead, Quadrmla tuherculata, 

 abundant; white niggerhead, Q. coccinea, scarce; cob shell, rabbit's 

 foot, Q. cylindrica, abundant ; rock mussel, washboard, Q. undidata, 

 abundant as all other species combined; Unio gibhosus, scarce; nig- 

 gertoe, Alasmidonta truncata, sand mussel, Symphynota costata, 

 scarce; Strophitus edentulus, common; fantail, Tiitogonia tuhercu- 

 lata, scarce ; Lampsilis ozarhensis, common ; spectacle case, Z. rectus, 

 scarce; green mugget, red mugget, grass mucket, Z. ligamentinus, 

 abundant. 



Station 18. — August 3. About 1 mile from camp L a mussel bed 

 was being Avorked for pearls by two farmers, the shells being col- 



