62 



CHESTER OSTRACODES OF ILLINOIS 



Paraparchites inornatus (McCoy) 



Plate 13, figures 13-14 



Cy there inornata McCoy, 1844, Syn. Char. Carb. 

 Fossils, Ireland, p. 167, pi. 23, fig. 18. 



Cytherella inornata. Richter, 1855, Deutsch. Geol. 

 Ges. Zeitschr., vol. 7, p. 529, pi. 26, figs. 6, 7. 



Leperditia okeni inornata Jones and KIrkby, 1875, 

 Ann. Mag. Nat. Hist., ser. 4, vol. 15, p. 54, 

 pi. 6, fig. 2, Carboniferous of Great Britain. 



Leperditia inornata. Jones and Kirkby, 1896, 

 Trans. Roy. Soc. Dublin, vol. 6, p. 183, pi. 11, 

 figs. 15, 16; pi. 12, figs. 1-3. 



Paraparchites inornata. Harlton, 1927, Jour. Pal- 

 eontology, vol. 1, p. 203, pi. 32, figs, la, b, 



Cisco forntiation. Delo, 1931, Washington 



Univ. Studies, n. ser. Sci. and Tec. no. 5, 

 p. 42, pi. 4, fig. 2, Pennsylvanian. 



Paraparchites inornatus. Latham, 1933, Trans. 

 Roy. Soc. Edinburgh, vol. 57, pt. 2, no. 12, 

 p. 355, text fig.. Carboniferous of Great 



Britain. Croneis and Gale, 1938, Bull. 



Denison Univ., Jour. Sci. Lab., vol. 33, p. 256, 



pi. 6, fig. 33, Golconda formation. Croneis 



and Gutke, 1939, idem., vol. 34, p. 37, pi. 1, 

 fig. 13, Renault formation. 



Length, 0.64 mm; height, 0.46 mm; 

 thickness, 0.28 mm. 



Renault formation, locality 25, common; 

 Paint Creek formation, locality 2, rare ; Gol- 

 conda formation, locality 18, common; Glen 

 Dean formation, locality 11, rare. 



Paraparchites nicklesi (Ulrich) 

 Plate 14, figures 5-7 



Leperditia nicklesi Ulrich, 1891, Jour. Cincinnati 

 Soc. Nat. Hist., vol. 13, p. 200, pi. 18, figs, 

 la, e, Chester series. 



Paraparchites nicklesi. Grabau and Shimer, 1910, 

 North Am. Index Fossils, p. 343, figs. 1657 c-f. 



Girty, 1911, U. S. Geol. Survey, Bull. 



439, p. 105, pi. 9, figs. 2-5, Moorefield shale, 

 ibid., 1915, Bull. 635, p. 134, pi. 11, fig. 2, 



Batesville sandstone. Harlton, 1929, Am. 



Jour. Sci., ser. 5, vol. 18, p. 255, pi. 1, fig. 1, 

 Fayetteville shale. Croneis, 1930, Arkan- 

 sas Geol. Survey, Bull. 3, p. 63, pi. 15, fig. 11. 



Morey, 1935, Jour. Paleontology, vol. 9, 



p. 317, pi. 28, fig. 26, Kinderhook group, 

 ibid., 1935, vol; 9, p. 475, pi. 54, fig. 8, Ams- 

 den formation; ibid., 1936, vol. 10, p. 115, pi. 



17, fig. 26, Chouteau limestone. Coryell 



and Johnson, 1939, idem., vol. 13, p. 214, 

 pi. 25, fig. 1, Clore formation. 



Length, 1.43 mm; height, 1.02 mm; 

 thickness, 0.71 mm. 



Renault formation, locality 25, rare; 

 Golconda formation, locality 19, common; 

 Clore formation, locality 27, common ; Kin- 

 kaid formation, locality 5, rare. 



Paraparchites ovatus Cooper, n. sp. 



Plate 14, figures 1-2 



Carapace strongly convex, symmetrical in 

 dorsal view ; subovate, in lateral view with 

 distinct retral swing; dorsal margin almost 

 straight; spine indistinct near dorsal mar- 

 gin, but well back from anterior end ; over- 

 lap very slight, especially on posterior mar- 

 gin ; greatest height well back of midlength ; 

 greatest thickness slightly forward, above 

 center. 



Length, 1.17 mm; height, 0.83 mm; 

 thickness, 0.58 mm. 



Clore formation, locality 26, rare. 



Genus Proparaparchites Cooper, n. gen.. 



Carapace ovate, ends symmetrical or 

 nearly so, sides convex, overlap around free 

 margin only; hingement straight and sim- 

 ple; surface smooth, without pits, nodes, or 

 spines. 



Genotype — P. ovatus n. sp., Kinkaid 

 formation. 



This genus differs from other Leperditel- 

 lidae in the symmetrical lateral and dorsal 

 outlines and in the lack of dorsal overlap. 



Proparaparchites fabulus Cooper, n.sp. 



Plate 14, figures 3-4 



Carapace ovate, bean-shaped, laterally 

 symmetrical, ends rounded ; venter convex, 

 dorsum slightly concave; dorsal outline 

 ovate, hinge straight posteriorly, curving 

 slightly toward left valve anteriorly; over- 

 lap moderate ; surface smooth. 



Length, 0.53 mm ; height, 0.29 mm ; 

 thickness, 0.23 mm. 



Renault formation, locality 13, rare. 



Differs from P. ovatus n. sp. in the 

 greater form ratio, 1.78. 



Proparaparchites ovatus Cooper, n. sp. 



Plate 14, figures 8-9 



Carapace ovate laterally, ends equally 

 rounded ; venter slightly convex, dorsum 

 straight ; overlap slight, uniform around 

 free margin ; dorsal outline elliptical ; hinge 

 line straight, slightly but very narrowly 

 channeled in central portion ; surface 

 smooth. 



Length, 0.50 mm ; height, 0.30 mm ; 

 thickness, 0.25 mm. 



Kinkaid formation, locality 3, abundant. 



