MICROFAUNA FROM JOHNSON COUNTY, ILLINOIS 



91 



resembles E. plummeri Cooper from the 

 Marble Falls (Texas) and Ferdinand (In- 

 diana) formations of Morrow age, in both 

 size and general shape. However, the ridges 

 of the younger species are more prominent, 

 the reticulations coarser, and the kirkbyan 

 pit larger and almost centered under the 

 medial node. The inner ridge of E. tumidus 

 is especially prominent compared to that of 

 E. plummeri. 



Kinkaid formation, beds 4-6, Johnson 

 County, Illinois. 



Family Kloedenellidae Ulrich and 



Bassler, 1923 



Genus Sansabella Roundy, 1926 



Sansabella harrisi Croneis and 



Funkhouser 



Plate 23, figures 26-29 



Sansabella harrisi Croneis and Funkhouser, 1938, 

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

 p. 334, pi. 9, figs. 7, 8; Clore formation. — 

 Cooper, 1941, Illinois Geol. Survey, Rept. 

 Inv. 77, p. 60, pi. 13, figs. 15, 16; Clore and 

 Kinkaid formations. 

 Sansabella- thurmani Croneis and Funkhouser, 

 * 1938, op. cit., p. 336, pi. 9, figs. 11, 12; Clore 

 formation. 



Like many other species of Sansabella this 

 one is found in two forms, one of which is the 

 mirror image of the other. It resembles S. 

 carbonaria, from the Missouri series, but is 

 not so elongate, nor does it have the 

 angulated line of concrescence of the 

 Pennsylvanian species. The younger form 

 also has a more prominent pit. 



Kinkaid formation, bed 4, Johnson 

 County, Illinois. 



Genus Sargentina Coryell and 



Johnson, 1939 



Sargentina crassimarginata (Croneis 



and Thurman) 



Plate 23, figures 30-34 



Sulcella crassimarginata Croneis and Thurman, 

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

 33, p. 328, pi. 7, figs. 15, 16; Kinkaid formation. 



Sargentina crassimarginata, Cooper, 1941, Illi- 

 nois Geol. Survey, Rept. Inv. 77, p. 39, pi. 6, 

 figs. 9, 10; Kinkaid formation. 



This common Kinkaid species is some- 

 what larger than representatives of the 

 genus which occur rather high in the Penn- 

 sylvanian system. S. tumida Cooper from 

 the "Centralia" zone may be distinguished 

 by its greater ellipticity and curved hinge- 



line and 5. elongata Cooper from the Little 

 Vermilion is more elongated and has a 

 hinge margin that is more nearly straight. 

 Kinkaid formation, bed 4, Johnson 

 County, Illinois. 



Conodonts Pander, 1856 



Genus Cavusgnathus Harris and 



Hollingsworth, 1933 



Cavusgnathus cristata Branson and Mehl 



Plate 20, figures 4-10 



Cavusgnathus cristata Branson and Mehl, 1940, 

 Denison Univ. Bull., Jour. Sci. Lab., vol. 35, 

 p. 177, pi. 5, figs. 26-31; Caney shale, Okla- 

 homa. 



This large species with its high platform 

 and deep trough, and the "cockscomb" de- 

 velopment on the oral side is confined to 

 Chester and younger formations. It is much 

 larger than the Pennsylvanian species, and 

 there appears to be little difference between 

 Caney and Kinkaid specimens, except that 

 those from the latter are slightly larger 

 (1.5 mm. and 2.0 mm., respectively). 



Kinkaid formation, bed 4, Johnson 

 County, Illinois. 



Genus Hindeodella Ulrich and 



Bassler, 1926 



Hindeodella sp. 



Plate 20, figures, 11-13 



This genus is represented only by frag- 

 ments of bars which are not specifically 

 determinable. However, three types of 

 dentition are represented: 1, Large denticles 

 alternating with groups of three smaller 

 ones, and slightly inclined (fig. 11); 2, large 

 denticles alternating with single small 

 denticles, all sharply inclined (fig. 12); and 

 3, all large denticles sharply inclined to bar 

 (fig. 13). Not enough specimens have been 

 obtained to determine characters that 

 might distinguish them from other Carbon- 

 iferous species. 



Kinkaid formation, beds 1, 4, 6, Johnson 

 County, Illinois. 



Genus Ligonodina Ulrich and 



Bassler, 1926 



Ligonodina cf. L. levis Branson and 



Mehl 



Plate 20, figure 17 



Ligonodina levis Branson and Mehl, 1941, 

 Denison Univ. Bull., Jour." Sci. Lab., vol. 35, 



