MICROFAUNA FROM JOHNSON COUNTY, ILLINOIS 



89 



Kinkaid formation, bed 7, Johnson 

 County, Illinois. 



HYPERAMMINA cf. H. glabra Cushman 



and Waters 



Plate 20, figure 33 



Hyperamimina glabra Cushman and Waters, 

 1927, Cushman Lab. Foram. Research Contr., 

 vol. 3, p. 146, pi. 26, fig. 1; upper Strawn, 

 Texas. — Cushman and Waters, 1930, Texas 

 Univ. Bull. 3019, p. 33, pi. 2, figs. 1-3; Cisco 

 group, Texas. 



This Kinkaid specimen seems to be 

 similar in most respects to the species from 

 the Pennsylvanian of Texas in its small 

 proloculum with a slight constriction above 

 it, followed by a long gradually widening 

 tube that is straight to slightly bowed. 



Kinkaid formation, bed 4, Johnson 

 County, Illinois. 



Hyperammina sp. 

 Plate 20, figures 28, 29 



The two large fragments apparently be- 

 long to this genus but the absence of a 

 proloculum precludes specific designation. 



Kinkaid formation, bed 7, Johnson 

 County, Illinois. 



Family Textularidae d'Orbigny, 1846 



Genus Palaeotextularia Schubert, 1920 



Palaeotextularia asper Cooper, n. sp. 



Plate 20, figures 31, 32 



Test biserial, chambers flat, elongate, in- 

 creasing in size in a regular manner, with 

 sutures parallel and indistinct; aperture a 

 low, central slit at base of apertural face; 

 walls granular. 



The biserial arrangement is similar to 

 Palaeotextularia sp. Harlton from the Johns 

 Valley shale, but the Kinkaid form is more 

 tenuous and has a more slender aperture. 

 P. asper is more stocky than P. grahamensis 

 (Cushman and Waters) and has a more 

 elongate aperture but is without the 

 globular chambers of the latter. 



Kinkaid formation, bed 5, Johnson 

 County, Illinois. 



Subclass Ostracoda Latreille, 1801 



All ostracode species of this fauna are 

 illustrated (pis. 21-23) but descriptions are 

 presented only for those that are new. 



Descriptions of the others may be obtained 

 readily from the published reports listed in 

 the references. Several short discussions 

 indicate the differentiation of some pre- 

 viously described Kinkaid species from 

 similar Pennsylvanian forms. 



Family Bairdiidae Sars, 1887 

 Genus Coryellites Kellett, 1936 



CORYELLITES CONCAVA (Cooper) 



Plate 21, figures 17, 18 



Bythocypris concava Cooper, 1941, Illinois Geol. 

 Survey Rept. Inv. 77, p. 28, pi. 3, figs. 3-6; 

 Vienna, Menard and Kinkaid formations, Illi- 

 nois. 



This species described from the upper 

 Chester should have been classified under 

 Coryellites for the reasons set forth in the 

 report on the Pennsylvanian ostracodes of 

 Illinois (Cooper, 1946, p. 55). 



Coryellites portica Cooper n. sp. 

 Plate 21, figures 23, 24 



Carapace ovate, dorsal and ventral mar- 

 gins unequally arched; ventral margin 

 straight; ends rounded; posterior consider- 

 ably higher and thicker than anterior; over- 

 lap moderate and uniform around all 

 margins. 



Length, 0.57 mm. ; height 0.35 mm. ; thick- 

 ness, 0.23 mm.; form ratio, 1.63. 



C. portica resembles C. subelliptica (Up- 

 son) and C. johnsoni (Upson) but is more 

 highly arched and has a more nearly per- 

 pendicular posterior margin than these 

 Pennsylvanian species. 



Kinkaid formation, bed 1, Johnson 

 County, Illinois. 



Family Drepanellidae Swartz, 1936 

 Genus Cornigella Warthin, 1930 



CORNIGELLA TUBERCULOSPINOSA (Jones 



and Kirkby) 

 Plate 21, figures 4-6 



(For synonomy see Cooper, 1946, p. 78.) 



This multinodose form appears in several 

 Chester and Pennsylvanian ostracode zones. 

 The Kinkaid specimens are indistinguish- 

 able from those of the Pennsylvanian, typi- 

 cally possessing an elongate, but blunt spine- 

 like node anterodorsally, behind which is 

 another similar but shorter node. All other 

 nodes (there is usually a total of 6 to 8) are 



