Plate 3 



Figures 



la, b. Eucythere semiglypta Swain and Brown, n. sp., beds of Washita age, 

 Caledonia Prison Farm water well T-2, Halifax County, North Caro- 

 lina 191-196 feet (la), and Odom water well No. T-l, Northampton 

 County, North Carolina 185-190 feet (lb), x 45. 

 la. Interior of paratype right valve, U.S.N.M. 132444 

 lb. Dorsal view of paratype shell, U.S.N.M. 132445 

 2. Ettcytheroides pustulosa (Swain), beds of Washita age, Odom water well 

 No. T-l, Northampton County, North Carolina, 185-190 feet, x 45. 

 Exterior of right valve, U.S.N.M. 132446 

 3a-c. Brachycytherc nausiformis Swain, upper member of Atkinson Forma- 

 tion, Escambia Oil Company's State Line Land and Lumber No. 1 

 well, Escambia County, Alabama, 4,679-4,684 feet, x 43. 

 3a, b. Right exterior views of two shells, U.S.N.M. 132447, 132448 

 3c. Ventral view, U.S.N.M. 132449 



4. Alatacythere tokiana (Israelsky) ?, upper member of Atkinson Forma- 



tion, Humble Oil and Refining Company's No. 1 Bennett and Langdale 

 well, Echols County, Georgia, 3,700-3,710 feet, x 43. 

 Right side of a shell, U.S.N.M. 132450 



5. Cythereis sp. aff. C. glabrella Triebel, beds of Washita age, DuPont water 



well No. 6, Lenoir County, North Carolina, 723-826 feet, x 45. 

 Exterior of right valve, U.S.N.M. 132451 

 6a-h. Cythereis eagle -fordensis Alexander, lower member of Atkinson Forma- 

 tion, Humble Oil and Refining Company's No. 1 Bennett and Langdale 

 well, Echols County, Georgia, 3,700-3,710 feet, x 43. 

 6a. Left side of large female? shell, U.S.N.M. 132452 

 6b. Ventral view of male shell, U.S.N.M. 132453 

 6c. Exterior of immature right valve questionably in the species, U.S.N.M. 



132454 

 6d. Interior of right valve, U.S.N.M. 132455 

 6e. Interior of left valve, U.S.N.M. 132456 

 6f. Left side of a shell, U.S.N.M. 132457 

 6g. Right side of a shell, U.S.N.M. 132458 

 6h. Exterior of an immature right valve, U.S.N.M. 132459 

 7a, b. Cythereis pittensis Swain and Brown, n. sp., Greenville City water well, 

 Pitt County, North Carolina, 608-754 feet, x 45. 

 Right side and dorsal views of holotype, U.S.N.M. 132460, 132461 

 8a-c. Cythereis quadrialira Swain, upper member of Atkinson Formation, 

 Humble Oil and Refining Company's No. 1 Tindel well, Jackson 

 County, Florida, 2,881-2,891 feet, x 43. 

 8a, b. Left sides of two shells, U.S.N.M. 132462, 132463 



8c. Right side of a shell, U.S.N.M. 132464 

 9a-f. Cythereis fredericksburgoides Swain and Brown, n. sp., lower member 

 of Atkinson Formation, Humble Oil and Refining Company's No. 1 

 Bennett and Langdale well, Echols County, Georgia, 3,700-3,710 feet, 

 x 43. 

 9a, b. Left sides of two paratype shells, U.S.N.M. 132465, 132466 

 9c. Interior of a paratype left valve, U.S.N.M. 132467 

 9d. Right side of holotype shell, U.S.N.M. 132468 



9e. Exterior of an immature paratype right valve, U.S.N.M. 132469 

 9f. Ventral view of a paratype shell, U.S.N.M. 132470 



10. Cythereis sp., lower member of Atkinson Formation, Coastal Petroleum 

 Company's No. 1 Wright well, Pinellas County, Florida, 7,100-7,107 

 feet, x 43, U.S.N.M. 132471 

 lla-e. Eocytheropteron greenvillensis Swain and Brown, n. sp., beds of Frede- 

 ricksburg (?) age, Greenville City water well, Pitt County, North 

 Carolina, 608-654 feet, x 45. 

 11a. Left side of holotype shell, U.S.N.M. 132475 

 lib. Interior of paratype right valve, U.S.N.M. 132476 

 lie. Interior of paratype left valve, U.S.N.M. 132477 

 lld,e. Dorsal views of two paratype shells, U.S.N.M. 132478, 132479 

 12a-f. Eocytheropteron venoides Swain and Brown, n. sp., beds of Washita age, 

 Greenville City water well, Pitt County, North Carolina, 608-754 feet, 

 x 45. 

 12a. Right side of holotype, a male shell, U.S.N.M. 132480 

 12b. Interior of paratype male left valve, U.S.N.M. 132481 

 12c. Interior of paratype female left valve, U.S.N.M. 132482 

 12d. Interior of paratype female right valve, U.S.N.M. 132483 



49 



