Explanation of Plate 8 



Figs. 1-3 Glyptopleura teretiformis Croneis and Thurman. Dorsum, left valve and posterior 

 end, x30. Kinkaid formation, loc. 5 



4-6 Glyptopleurina? hulbosa Croneis and Gale. Dorsum, left valve and posterior end, 

 x30. Golconda formation, loc. 22 



7-8 Glyptopleurina tniqua Cooper, n. sp. Dorsum and right valve. Holotype, x30. 



Vienna formation, loc. 10 p. 43 



9 Glyptopleurina oehersi (Croneis and Bristol). Left valve, x30. Menard formation, 



loc. 28 p. 43 



10-11 Glyptopleura tyri (Coryell and Johnson). Right valve and dorsum, x30. Clore 



formation, loc. 27 p. 42 



12-14 Glyptopleura symmetrica Croneis and Thurman. Dorsum, left valve and posterior 



end, x30. Kinkaid formation, loc. 5 p. 41 



15-17 Glyptopleura varians Croneis and Funkhouser. Dorsum, left valve and anterior 



end, x30. Kinkaid formation, loc. 3 p. 42 



18 Glyptopleurina complexa Croneis and Bristol. Right valve, x30. Glen Dean forma- 



tion, loc. 1 



19-21 Glyptopleura venosa (Ulrich). Dorsum, left valve, and posterior end, x30. Kinkaid 



formation, loc. 3 p. 42 



22-24 Glyptopleura variacostata Croneis and Thurman. Left valve, posterior end and 

 dorsum, x30. Kinkaid formation, loc. 5 



25-27 Glyptopleurina flexuosa Cooper, n. sp. Dorsum, left valve, and posterior end. Holo- 

 type, x30. Paint Creek formation, loc. 2 p. 42 



28-29 Glyptopleuroides insculptus Croneis and Gale. Dorsum and left valve, x40. Kinkaid 

 formation, loc. 5 



30-31 Glyptopleurina simplex Cioneis and Bristol. Dorsum and left valve of a crushed 

 and flattened specimen, x30. Vienna formation, loc. 10 



32-34 Glyptopleurina coryelli Coneis and Gutke. Dorsum, left valve, and posterior end, 

 x30. Golconda formation, loc. 19 



35-37 Glyptopleurina ornata (Croneis and Gale). Dorsum, left valve and posterior end, 



x30. Golconda formation, loc. 19 p. 43 



38-41 Glyptopleurina simulatrix (Ulrich). 38, left valve, Golconda formation, loc. 28; 



39-41, anterior end, left valve and dorsum. Paint Creek formation, loc. 2; x30 p. 43 



42-43 Glyptopleurina simulans Croneis and Gutke. Dorsum and left valve, x30. Renault 

 formation, loc. 9 



44-46 Glyptopleurina 'vetula Cooper, n. sp. Dorsum, left valve and posterior end. Holo- 

 type, x30. Golconda formation, loc. 19 p. 44 



47-49 Mesoglyphd mediocre Cooper, n. sp. Dorsum, left valve and posterior end. Geno- 

 type, x30. Golconda formation, loc. 19 p. 44 



50-52 Glyptopleurina longuronis Cooper, n. sp. Left valve, posterior end and dorsum. 



Holotype, x30. Renault formation, loc. 9 p. 43 



53-54 Glyptopleurina insculpta (Croneis and Funkhouser). Dorsum and left valve, x30. 



Kinkaid formation, loc. 5 p. 43 



[83] 



