PLATE XII. 



Page. 

 FiGfRES 1-3. S<ih<iIl!('S ymyanns Lcsquereux 177 



1, 2. Losquereux's types from the llcilly Spring.s sand at ( Ixfonl, Miss. 

 3. Wilccix group at Benton, Ark. 

 I'lOURE 4. Cfianuidorca dutiai (Lcsquerfux) Berry from Arkcrman formation at ( oli-mans Mill, ( 'liocl;uv ( 'nunty, 



Miss 179 



359 



