GLYPTOPLEURIDAE 



41 



Length, 0.89 mm; height, 0.50 mm; 

 thickness, 0.49 mm. 



Renault formation, locality 9, common. 



Glyptopleura inoptina Girty 



Plate 7, figures 20-22 



Glyptopleura inoptina Girty, 1910, Ann. New 

 York Acad. Sci., vol. 20, p. 236, Fayetteville 



shale. Roth, 1929, Pub. Wagner Free Inst. 



Sci., vol. 1, pp. 7, 35, 36. Coryell and 



Brockmier, 1931, Am. Midland Nat., vol. 12, 

 p. 509. 



Carapace subquadrate ends rounded; 

 dorsum straight, venter slightly convex; 

 overlap very prominent around free 

 margins; hinge slightly channeled, termin- 

 ated posteriorly by well developed lip which 

 overlaps margin; cardinal extremities an- 

 gular, ventral extremities curved ; pit slight 

 above and back of center ; costae prominent, 

 regular, oblique; rib bends sharply upward 

 around pit, coalescing with the rib next 

 above rather than being broken by pit as 

 in most other species. 



Length, 1.34 mm; height, 0.83 mm; 

 thickness, 0.47 mm. 



Clore formation, locality 26, rare. 



This form, common in the Fayetteville 

 shale and Pitkin limestone of Arkansas, 

 is characteried by the union of the two ribs 

 immediately above the pit. This form is 

 thought to be identical with the form des- 

 cribed but not figured by Girty (1910) 

 from the Arkansas formation. G. costata 

 (McCoy) also resembles this form in the 

 rib arrangement but is shorter and lacks the 

 rounded anterior margin of G, inoptina. 



Glyptopleura kellettae 



Croneis and Thurman 



Plate 7, figure 12 



Glyptopleura kellettae Croneis and Thurman, 

 1938, Bull. Denison Univ., Jour. Sci. Lab., 

 vol. 33, p. 319, pi. 7, fig. 8, Kinkaid formation. 



Length, 0.84 mm; height, 0.42 mm. 

 Clore formation, locality 26, rare; Kin- 

 kaid formation, locality 10, common. 



This specimen is somewhat less rounded 

 on the posterior end than the holotype, but 

 the rib pattern is similar. The original 

 figure of the holotype shows an over ac- 

 centuation of the ribs because of a heavy 

 coat of ammonium chloride. 



Glyptopleura multicostata Morey 



Plate 7, figures 33-34 



Glyptopleura multicostata Morey, 1935, Jour. 



Paleontology, vol. 9, p. 477, pi. 54, fig. 9, 



Amsden formation. 

 Glyptopleura valkyriae Coryell and Johnson, 



1939, Jour. Palentology, vol. 13, p. 218, pi. 



25, fig. 6, Clore formation. 



Length, 1.05 mm; height, 0.67 mm; 

 thickness, 0.44 mm. 



Clore formation, locality 27, rare. 



This Clore form, although a little higher 

 than the one described by Morey, appears 

 very close to that species, especially in the 

 arrangement of the surface markings. 



Glyptopleura spinosa 

 (Jones and Kirkby) 



Plate 7, figures 17-19 



Kirkhya spinosa Jones and Kirkby, 1885, Ann. 

 Mag. Nat. Hist., ser. 5, vol. 15, p. 185, pi. 3, 

 fig. 12, Lower Carboniferous of Great Britain. 



Glyptopleura spinosa. Coryell and Brackmier, 

 1931, Am. Midland Nat. vol. 12, p. 513, pi. 2, 



fig. 10. Latham, 1932, Trans. Roy. Soc. 



Edinburgh, vol. 72, pt. 2, p. 732, fig. 20, 

 Lower Carboniferous of Great Britain. 



Carapace small, short, retral swing prom- 

 inent; ribs form single inclined loop or U 

 across shell, upper side crossing deep elong- 

 ate pit and terminating in antero-dorsal 

 quarter in sharp elongate, spine-like node; 

 surface reticulate; greatest thickness and 

 height anterior ; overlap slight. 



Length, 0.48 mm; height, 0.29 mm; 

 thickness, 0.25 mm. 



Menard formation, locality 20, rare. 



The lateral view of this form resembles 

 G. parvacostata Geis, but lacks the promin- 

 ent overlap of the Salem species. 



Glyptopleura symmetrica 



Croneis and Funkhoiiser 



Plate 8, figures 12-14 



Glyptopleura symmetrica Croneis and Funk- 



houser, 1938, Bull. Denison Univ., Jour. Sci. 



Lab., vol. 33, p. 353, pi. 10, fig. 1, Clore 



formation. 

 Glyptopleura nertJiusae Coryell and Johnson, 



1939, Jour. Paleontology, vol. 13, p. 217, pi. 



25, figs. 5a, b, Clore formation. 



Length, 1.02 mm; height, 0.59 mm; 

 thickness, 0.53 mm. 



Kinkaid formation, locality 5, common; 

 Clore formation, locality 26, rare. 



