50 ------------------------------------ FOSSIL POLYTHALAMIA FROM NORTH AMERICA ------------------------------------ S C 1103 A Monterey, California; fossil Polythalamia; extracted by means of KO, from a greenish stone S C 1104 B Monterey, California; fossil Polythalamia; by KO S C 1105 C Monterey, California; fossil Polythalamia; by KO S C 1106 D Monterey, California; fossil S C 1107 E Leon Springs, West Texas; U.S. Mexican Boundary Survey, no. 18; Cretaceous S C 1108 F Upper Missouri; yellow calcareous marl S C 1109 G Upper Missouri; yellow calcareous marl; Dr. Nicollet S C 1110 H Upper Missouri; yellow calcareous marl S P C 1111 I Upper Missouri; yellow calcareous marl; Cretaceous S C 1112 J Columbus, Mississippi; coarsest part; 260 feet S C 1113 K Columbus, Mississippi; coarsest part; 260 feet S P C 1114 L Columbus, Mississippi; 140 feet S P C 1115 M Columbus, Mississippi; 140 feet S P C 1116 N Columbus, Mississippi; 140 feet; heavy part S C 1117 O Columbus, Mississippi; 260 feet; heaviest part S P C 1118 P Jackson, Mississippi S P C 1119 Q Jackson, Mississippi S C 1120 R Mississippi Station, Mississippi S C 1121 S Mississippi Station, Mississippi S P C 1122 T Alabama; matrix of Zygodon. S C 1123 U Centreport, Alabama S C 1124 V Centreport, Alabama S P C 1125 W Centreport, Alabama S C 1126 X South Carolina; Eocene; Polythalamia with Ostrea sellaefomis S C 1127 Y [No locality]; chalk; cleaned with CO²