8 



CHESTER OSTRACODES OF ILLINOIS 



n. sp., is one of the few Chester genera re- 

 stricted to a single formation. Insofar as 

 now known, none of these species are found 

 outside the Renault. The following list 

 contains those species found only in the 

 Renault. 



Species Restricted to the Renault 

 Formation 



Monoceratina opima n. sp. 

 *Bairdia aequa n. sp. 



Bairdia impendere n. sp. 



Bairdia insolens n. sp. 



Bairdiolites tenuis n. sp. 



Bythocypris gibba n. sp. 

 *Bythocypris truncata n. sp. 



Hastacypris bradyi Croneis and Gutke 



Incisurella prima n. sp. 



Macrocypris biconcava Croneis and Gutke 



Microcheilinella? exilis n. sp. 



Seminolites ovalis n. sp. 



Glyptopleura elliptica Croneis and Gutke 

 *GlyptopIeura henbesti Croneis and Gutke 

 *Glyptopleurina longuronis n. sp. 



Glyptopleurina simulans Croneis and Gutke 



*Glyptopleuroides girtyi Croneis and Gutke 

 *Glyptopleuroides perplexus Croneis and 



Gutke. 

 *Hollinella longispina (Jones and Kirkby) 



Discoidella ampla n. sp. 



Polytylites ambitus n. sp. 



Polytylites grovei (Croneis and Gutke) 

 *Chesterella exuta Croneis and Gutke 

 *Chesterella fissurata Croneis and Gutke 

 *Chesterella? incerta n, sp. 



Knoxina rogatzi Croneis and Gutke 



Neokloedenella subquadrata Croneis and 

 Gutke 



Sansabella vinitaensis (Harlton) 



Proparaparchites fabulus n. sp. 



Coryellina elegans (Croneis and Gutke) 



Moorites intermedins n. sp. 



Paint Creek formation. — Although all re- 

 stricted Paint Creek species are new, several 

 of the 31 should make good horizon mark- 

 ers. Cribroconcha fornicata, possessing char- 

 acteristics of both Healdia and Seminolites^ 

 is a distinctive form not found in any other 



* Species of probable correlative value. 



Check List of Chester Ostracode Species^ 



Illinois Chester Formations" 



Other Chester Formations'^ 





Elvira 



Homberg 



New 

 Design 



H 



<u 

 C 



PQ 



< 



>• 



< 



(U 



to 





> 



"o 

 c 

 >^ 



<u 



6 



s 

 < 



S2" c 





t5 





T3 



C 



C 

 C 



> 



Q 

 c 







c 











u 



Oh 



■i-j 

 3 

 C 



•5PQ 



Total species 



81 



74 



74 



48 



40 



94 



61 



67 



7 



4 



32 



19 



IS 



17 



10 



Kinkaid 



51 



63 



28 

 70 



26 



47 



18 



45 



7 



24 



9 



16 



7 



23 



8 



22 







2 



10 





6 



4 



2 



Clore 



28 



55 



40 



54 



20 

 36 



15 



38 



5 



17 



9 



16 



4 



13 



4 

 11 



1 



1 



7 





8 



6 



1 



Menard 



26 



51 



20 



50 



55 



74 



32 

 80 



13 



45 



18 



32 



8 

 27 



8 



22 











8 





12 



2 



2 



Vienna 



18 



35 



15 



38 



32 

 58 



40 



83 



7 

 24 



17 



30 



7 



23 



10 



28 











7 





7 



1 



2 



Glen Dean 



.^^ 



5 

 13 



13 



24 



7 



18 



29 



73 



21 



37 



3 

 10 



9 



25 







1 



6 





5 



3 



3 



Golconda 



9 



18 



9 



23 



18 



33 



17 



43 



20 

 69 



57 



61 



18 

 60 



20 



55 



1 



1 



9 





5 



1 



-7 



Paint Creek 



7 

 14 



4 

 10 



8 

 14 



7 

 18 



3 

 10 



18 



32 



30 



49 



15 



42 











5 



2 



4 











Renault 



8 

 16 



4 

 10 



8 

 14 



10 



25 



9 



31 



20 



35 



15 



50 



36 



54 







1 



7 



3 



2 



1 







a In the first eight vertical columns the upper number in black type at the intersection of the horizontal and vertical columns of 

 any one formation represents the number of species in this formation which are found in other Illinois Chester formations (51 of the 

 81 Kinkaid species are found in other formations). The figures below the black face numbers show the per cent of the total species 

 present in other formations. The upper figures at the Intersection of other horizontal and vertical columns represent the number of 

 species common to any two formations (e.g., 32 species are common to the Vienna and Menard formations). The lower figure in 

 small type gives the percentage of the species common to any two formations (e.g., the 32 Menard species found in the Vienna repre- 

 sents 58 per cent of the 55 Menard species present in other formations; likewise the 32 Vienna species in the Menard represents SO 

 per cent of the 40 Vienna species present in other formations). 

 5 In the last seven columns the figures show the number of species from other formations recognized in the Chester of Illinois. 



