Explanation of Plate 4 



Figs. 1-2 Healdia ornata Morey. Dorsum and right valve, x40. Glen Dean formation, loc. 11 p. 32 



3-5 Healdia menisca Cooper, n. sp. Posterior end, dorsum, and right valve. Holotype, 



x40. Paint Creek formation, loc. 24 p. 31 



6-7 Healdia minuta Cooper, n. sp. Dorsum and left valve. Holotype, x40. Paint Creek 



formation, loc. 24 p. 31 



8-10 Healdia mucronata Cooper, n. sp. Posterior end, dorsum, and right valve. Holotype, 



x40. Golconda formation, loc. 19 p. 31 



11-12 Healdia vinitaensis Harlton. Dorsum and right valve, x40. Vienna formation, loc. 10 p. 32 



13-14 Healdia tenuicosta Cooper, n. sp. Dorsum and right valve. Holotype, x40. Clore 



formation, loc. 4 p. 32 



15-17 Healdia ovoidea Cooper, n. sp. Posterior end, dorsum and right valve. Holotype, 



x40. Golconda formation, loc. 19 p. 32 



18-20 Healdia radinula Cooper, n. sp. Posterior end, dorsum and right valve. Holotype, 



x40. Paint Creek formation, loc. 24 p. 32 



21-22 Incisurella lata Cooper, n. sp. Dorsum and right valve. Holotype, x40. Paint Creek 



formation, loc. 14 p. 33 



23-24 Microcheilinella cordata Cooper, n. sp. Dorsum and right valve. Holotype, x40. 



Kinkaid formation, loc. 3 . p. 33 



25-26 Macrocypris oirata Cooper, n. sp. Dorsum and left valve. Holotype, x30. Kinkaid 



formation, loc. 3 p. 34 



27-29 Incisurella prima Cooper, n. sp. Posterior end, dorsal view, and right valve. Geno- 

 type, x40. Renault formation, loc. 9 p. 32 



30-31 Macrocypris acuminata Cooper, n. sp. Dorsum and left valve. Holotype, x30. 



Menard formation, loc. 30 p. 34 



32-34 Seminolites ovalis Cooper, n. sp. Posterior end, dorsum and right valve. Holotype, 



x40. Renault formation, loc. 13 p. 33 



35-38 Microcheilinella ohesa Cooper, n. sp. Posterior end, dorsum, right valve and venter. 



Holotype, x40. Menard formation, loc. 28 p. 33 



39^0 Microcheilinella per gracilis Croneis and Gale. Dorsum and right valve, x40. Vienna 

 formation, loc. 10 



41 — 4-2 Seminolites? reversus Cooper, n. sp. Dorsum and left valve, Holotype, x40. Gol- 

 conda formation, loc. 17 p. 34 



43-44 Macrocypris reginni Coryell and Johnson. Dorsum and left valve, x30. Kinkaid 

 formation, loc. 3 



45-46 Microcheilinella? exilis Cooper, n. sp. Dorsum and right valve. Holotype, x40. 



Renault formation, loc. 9 p. 33 



47-49 Microcheilinella tumida Cooper, n. sp. Dorsum, right valve, and venter. Holotype, 



x40. Golconda formation, loc. 17 p. 33 



50-52 Seminolites sohni Croneis and Bristol. Posterior end, right valve and dorsum, x40. 

 Golconda formation, loc. 19 



53-55 Seminolites symmetricus Cooper, n. sp. Posterior end, dorsum and right valve. 



Holotype, x40. Paint Creek formation, loc. 2 p. 34 



75] 



