Figure 3. Page 



3a. Cytherella beyrichoidcs Swain and Brown, n. sp., interior of 

 holotype right valve, 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 . . 8 



3b. Cypridea diminuta Vanderpool, interior of paratype left 



valve, DeQueen Limestone, Gypsum Bluff, Arkansas 16 



3c. Cypridea dequeenensis Swain and Brown, n. sp., interior of 

 paratype right valve, DeQueen Limestone, Gypsum Bluff, 

 Arkansas 15 



Figure 4. Page 



4a. Cypridea dequeenensis Swain and Brown, n. sp., interior of 

 holotype left valve, DeQueen Limestone, Gypsum Bluff, 

 Arkansas 15 



4b. Cypridea wyomingensis Jones, interior of a left valve, 



DeQueen Limestone, Gypsum Bluff, Arkansas 16 



11 



