GLYPTOPLEURIDAE 



43 



Length, 0.71 mm; height, 0.47 mm; 

 thickness, 0.44 mm. 



Paint Creek formation, locality 2, rare. 



This species resembles G. bulbosa Croneis 

 and Gale, but lacks the separation of the 

 rib from the anterior lobe, and the decided 

 curvature. The marginal ridge is also 

 farther from the edge of the shell than in 

 that species. 



Glyptopleurina iniqua Cooper, n. sp. 

 Plate 8, figures 7-8 



Carapace large, dorsum straight, venter 

 broadly curved ; ends rounded, highest an- 

 teriorly, posterior end thickest; node joined 

 to posterior swelling by prominent rib which 

 is concave downward ; marginal flange 

 prominent only on anterior end ; surface 

 reticulate; hinge straight. 



Length, 0.87 mm; height, 0.51 mm; 

 thickness, 0.42 mm. 



Vienna formation, locality 10, common. 



This species is distinguished by the very 

 unequal height of the two ends and by the 

 extreme obesity of the posterior end. 



Glyptopleurina insculpta 



(Croneis and Funkhouser) 



Plate 8, figures 53-54 



Jonesina insculpta Croneis and Funkhouser, 1938, 

 Bull. Denison Univ., Jour. Sci. Lab., vol. 33, 

 p. 342, pi. 10, figs. 21, 22, Clore formation. 



Length, 0.88 mm; height, 0.53 mm; 

 thickness, 0.42 mm. 



Clore formation, locality 26, rare; Kin- 

 kaid formation, locality 5, common. 



The Kinkaid specimen is slightly more 

 tumid than the holotype, but is in close 

 agreement w4th the paratypes, which show 

 the faint ridge subparallel to the antero- 

 ventral portion of the free margin. 



Glyptopleurina insignis 

 (Croneis and Gale) 



Idiomorphifia insignis Croneis and Gale, 1938, 

 Bull. Denison Univ., Jour. Sci. Lab., vol. 33, 

 p. 284, pi. 6, fig. 4, Golconda formation. 



Glyptopleurina longuronis 



Cooper, n. sp. 



Plate 8, figures 50-52 



Carapace elongate; dorsum straight, 

 venter broadly curved ; anterior node ovate, 

 lower side joined to narrow rib which 

 turns abruptly backward, ending in spine- 

 like knob; marginal lobe marked with nar- 



row carina, curving up and around node; 

 sinus small but deep ; ends rounded and 

 greatly produced, making total length much 

 greater than length of hinge; flat marginal 

 flange prominent only on ends; hinge im- 

 pressed into cardinal area as straight narrow 

 groove ; portion of frill preserved anteriorly ; 

 surface reticulate ; greatest thickness central. 



Length, 0.73 mm; height, 0.40 mm; 

 thickness, 0.34 mm. 



Renault formation, locality 9, rare. 



This form, in contrast to G. bulbosa 

 Croneis and Gale and G. flexuosa n. sp., is 

 thickest in the central portion, suggesting 

 that it is either a male or non-fertile female, 

 and that the wedge-shaped forms with the 

 greatest thickness quite close to the posterior 

 end are fertile females. This difference is 

 discernible only in the dorsal view. 



Glyptopleurina oehersi 



(Croneis and Bristol) 



Plate 8, figure 9 



Idiomorphina oehersi Croneis and Bristol, 1939, 

 Bull. Denison Univ., Jour. Sci. Lab., vol. 34, 

 p. 94, pi. 4, fig. 17, Menard formation. 



Length, 0.89 mm ; height, 0.48 mm. 



Golconda formation, locality 22, rare ; 

 Vienna formation, locality 36, common ; 

 Menard formation, locality 28, depth 746- 

 749 feet, common. 



Glyptopleurina ornata 

 (Croneis and Gale) 

 Plate 8, figures 35-37 



Idiomorphina ornata Croneis and Gale, 1938, 

 Bull. Denison Univ., Jour. Sci. Lab., vol. 33, 

 p. 285, pi. 6, figs. 1, 2, Golconda formation. 



Length, 0.77 mm; height, 0.44 mm; 

 thickness, 0.41 mm. 



Golconda formation, locality 19, rare; 

 Glen Dean formation, locality 11, rare. 



Glyptopleurina simulatrix (Ulrich) 



Plate 8, figures 38-41 



Beyrichia simulatrix Ulrich, 1891, Jour. Cincin- 

 nati Soc. Nat. Hist., vol. 13, p. 205, pi. 18, 

 figs. 7a, b, Chester series. 



Hollinella simulatrix. Bassler and Kellett, 1935, 

 Geol. Soc. Am. Spec. Paper 1, p. 335. 



Carapace elongate, ovate ends rounded, 

 hinge straight; nodes just below dorsum 

 connected by curved, narrow rib-like ridge ; 

 ridge bordered below and on posterior end 

 by wider, hook-shaped ridge, broadest an- 

 teriorly, gradually tapering and ending 



