if echinoderms are from the vicinity of Kestrel Lake in the Ketchum. The casts of his types before us were in exchange for recent Pter- taerosis. However he never received anything in return. And has a further specimen if possible, Can exchange the following good Ketchum crinoids. Balanocrinus neohavii having spinous processes, of Aegoceras mississippiensis a slab with 2 speci- men showing the spines. Also calices of dsame. Of Agaricocrinus americanus we have specimen with several of th arms well preserved. Also free calices. There between others some flattened speci-men for the blue grouper. Can have a small slab from the Ketchum formation. O. S. Anderson, Kestrel Lake (Missouri Ave) is another collector, Has two good calcite gerdens with Millenite. One large specimen fr