Explanation of Plate 3 



Figs. 1-2 Bythocypris dorensis Croneis and Funkhouser. Dorsum and right valve, x40, Kin- 



kaid formation, loc. 6 p. 28 



3-6 Bythocypris concava Cooper, n. sp. Dorsum and right valve; 3, 4 holotype, Kinkaid 



formation, loc. 6 ; 5, 6, Vienna formation, loc. 10, x40 p. 28 



7-8 Bythocypris gihha Cooper, n. sp. Dorsum and right valve. Holotype, x40. Renault 



formation, loc. 9 p. 28 



9-10 Bythocypris modica Cooper, n. sp. Dorsum and right valve. Holotype, x40. Paint 



Creek formation, loc. 24 p. 28 



11-13 Bythocypris ovata Cooper, n. sp. Dorsum, right valve, and venter. Holotype, x30. 



Paint Creek formation, loc. 21 p. 29 



14-16 Healdia cornigera (Jones and Kirkby). Posterior end, dorsum, and right valve, x40. 



Golconda formation, loc. 19 p. 30 



17-19 Healdia aequahilis Cooper, n. sp. Posterior end, dorsum, and right valve. Holotype, 



x40. Renault formation, loc. 25 p. 30 



20-21 Bythocypris opitna Cooper, n. sp. Dorsum and right valve. Holotype, x30. Gol- 

 conda formation, loc. 22 p. 29 



22-28 Bythocypris truncata Cooper, n. sp. 22-25, dorsum, right valve, venter, and anterior 

 end, x40 ; 26-28, dorsum, posterior end, and right valve of holotype, x30. 

 Renault formation, loc. 25 p. 29 



29-30 Bythocypris fahalis Cooper, n. sp. Dorsal view and right valve. Holotype, x20. 



Paint Creek formation, loc. 23 p. 28 



31-33 Healdia goniapleura Croneis and Bristol. Posterior end, right valve, and dorsum, 

 x40. Vienna formation, loc. 10 



34-36 Cribroconcha fornicata Cooper, n. sp. Posterior end, dorsum and right valve. Holo- 

 type, x40. Paint Creek formation, loc. 24 p. 30 



37-42 Cribroconcha costata Cooper, n. sp. 37-39, dorsum, left valve, and posterior end; 

 ^Q-A2y posterior end, right valve, and dorsum of genotype, x40. Renault for- 

 mation, loc. 9 p. 29 



43-45 Healdia elliptica Cooper, n. sp. Posterior end, dorsum, and right valve. Holotype, 



x40. Golconda formation, loc. 19 p. 31 



46-49 Healdia caneyensis Harlton. Dorsum and right valves of two specimens, x40. Glen 



Dean formation, loc. 11 p. 30 



50-51 Healdia fayettevillensis Harlton. Dorsum and right valves. x40. Clore formation, 



loc. 4 p. 31 



52-54 Healdia exilis Cooper, n. sp. Posterior end, dorsum and right valve. Holotype, x40. 



Vienna formation, loc. 10 p. 31 



72 



