Explanation of Plate 7 



Figs. 1-3 Glyptopleura circumcostata Cooper, n. sp. Dorsum, left valve, and posterior end. 



Holotype, x30. Kinkaid formation, loc. 3 p. 40 



4 Glyptopleura conflexacostata Croneis and Gale. Right valve, x30. Vienna forma- 



tion, loc. 10 



5-6 Glyptopleura gibha Croneis and Gale. Dorsum and right valve, x30. Paint Creek 

 formation, loc. 2 



7-8 Glyptopleura decacostata Croneis and Gale. Dorsum and right valve, x30. Gol- 

 conda formation, loc. 23 



9-11 Glyptopleura henhesti Croneis and Gutke. Dorsum, left valve, and posterior end, 



x30. Renault formation, loc. 9 p. 40 



12 Glyptopleura kellettae Croneis and Thurman. Right valve, x30. Clore formation, 



loc. 26 p. 41 



13-14 Glyptopleura intermedia Croneis and Gale. Dorsum and left valve, x30. Golconda 

 formation, loc. 19 



15-16 Gyptopleura cf. pentacostata Croneis and Gale. Dorsum and left valve, x40. Gol- 

 conda formation, loc. 28 



17-19 Gyptopleura spinosa (Jones and Kirkby). Dorsum, left valve, and posterior end, 



x40. Menard formation, loc. 20 p. 41 



20-22 Glyptopleura inoptina Girty. Dorsum, left valve and posterior end of male, x20. 



Clore formation, loc. 26 p. 41 



23-24 Glyptopleura similis Croneis and Funkhouser. Dorsum and right valve, x30. Clore 

 formation, loc. 26 



25-27 Glyptopleura reniformis Croneis and Thurman. Dorsum, left valve and posterior 

 end, x30. Kinkaid formation, loc. 5 



28-30 Glyptopleura pseudosulcata Croneis and Thurman. Dorsum, right valve, and 

 posterior end, x40. Menard formation, loc. 28 



31 Glyptopleura kayi Croneis and Bristol. Left valve, x20. Menard formation, loc. 20 



32 Glyptopleura complexa Croneis and Funkhouser. Left valve, x30. Menard forma- 



tion, loc. 28 p. 40 



33-34 Glyptopleura multicostata Morey. Dorsum and right valve of a mashed specimen, 



x30. Clore formation, loc. 27 p. 41 



35-37 Glyptopleura compta Croneis and Thurman. Dorsum, left valve, and posterior 

 end, x30. Kinkaid formation, loc. 5 



38-39 Glyptopleura sagae Coryell and Johnson. Left valve and dorsum, x40. Clore for- 

 mation, loc. 27 



40 Glyptopleura harltoni Croneis and Bristol. Right valve, x30. Menard formation, 



loc. 20 



41 Glyptopleura intermedia Croneis and Gale. Right valve, x30. Menard formation, 



loc. 32 



42 Glyptopleura elongata Cooper, n. sp. Left valve. Holotype, x30. Clore formation, 



loc. 26 p. 40 



[80] 



