10 



CHESTER OSTRACODES OF ILLINOIS 



*Beyrichia placida Croneis and Gale 

 Cavellina longula n. sp. 

 Paracavellina elliptica n. sp. 



*ParacavellLia pinguis n. sp. 

 Golcondella sulcata Croneis and Gale 

 Glyptopleura curvata Croneis and Gale 



*Glyptopleura decacostata Croneis and Gale 



*Glyptopleura pentacostata Croneis and Gale 

 Glyptopleurina insignis Croneis and Gale 



*Glyptopleurina vetula n. sp. 

 Discoidella simplex Croneis and Gale 

 Kirkbya regularia Croneis and Gale 

 Kirkbya cf. reflexa Girty 

 Kirkbya turrita Croneis and Gale 

 Polytylites similis (Croneis and Gale) 

 Polytylites trilobus (Croneis and Gale) 



*Denisonia brevicosta n. sp. 



*Denisonia cirrata n. sp. 



*Geffenina? praelonga n. sp. 

 Jonesina persulcata Croneis and Gale 

 Knightina neglecta Croneis and Gale 

 Knightina pinguoides Croneis and Gale 

 Neokloedenella? magna n. sp. 

 Perprimitia? bicornis Croneis and Gale 

 Sansabella declivis n. sp. 

 Sansabella truncata n. sp. 



Glen Dean formation. — As in other for- 

 mations, about half of the restricted species 

 of the Glen Dean are of value as index fos- 

 sils. Of the remainder, four are species 

 described by Ulrich (1891) from Kentucky 

 and Illinois and have not been recognized 

 by subsequent workers. Polytylites directus 

 n. sp. is easily recognized because of its un- 

 usually elongated vertical nodes. Acratia 

 mucronata n. sp., Bairdia attenuata Girty, 

 and Kloedenella macer n. sp. are also dis- 

 tinctive of the Glen Dean. 



Species Restricted to the Glen Dean 

 Formation 



*Acratia mucronata n. sp. 

 *Bairdia attenuata Girty 



Healdia caneyensis Harlton 

 *Polytylites directus n. sp. 



Polytylites tricollinus (Jones and Kirkby) 

 ^Kloedenella macer n. sp. 



Primitia cestriensis Ulrich 



Primitia granimarginata Ulrich 



Primitia simulans Ulrich 



Moorea granosa Ulrich 



Elvira Group 



Nine genera were found to occur exclu- 

 sively in the upper Chester group, namely, 

 Beyrichiopsis, Rlatychilus, Sargentina, Ve- 

 nula, Balantoides, Gillina, Kloedenellina, 

 Pseudoparaparchites, and Carbo primitia. 

 The first, Beyrichiopsis, is known in the 

 Devonian, so it is presumed that species yet 

 undescribed will be found in the older 



■Species of probable correlative value. 



Chester groups. P seudoparaparchites is rep- 

 resented in the Pennsylvanian and Permian, 

 but is unknown below the Elvira. All other 

 genera listed above are restricted to the 

 group. 



Many species of the Elvira are restricted 

 to two adjacent formations, and in many 

 cases will serve as good index forms when 

 others are not available. These species are 

 given in the following lists, those thought 

 to be of greatest value being marked with 

 an asterisk. 



Kincaid-Clore Species 



*Bairdia sinuosa n. sp. 

 Bairdiolites elongatus Croneis and Funk- 

 houser 

 *Bythocypris clorensis Croneis and Funk- 

 houser 

 Macrocypris reginni Coryell and Johnson 

 Glyptopleura alata Croneis and Funk- 



houser 

 Glyptopleura compta Croneis and Thurman 

 Glyptopleura symmetrica Croneis and Funk- 



houser 

 Glyptopleurina insculpta (Croneis and 

 Funkhouser) 

 *Venula striata (Croneis and Funkhouser) 

 *Ectodemites tumidus n. sp. 

 *Ectodemites warei (Morey) 

 *Perprimitia funkhouseri Croneis and Thur- 

 man 

 Sansabella harrisi Croneis and Funkhouser 



Clore-Menard Species 



Healdia fayettevillensis Harlton 

 Kirkbya aequalis Croneis and Funkhouser 

 *Denisonia cincta Croneis and Bristol 

 Jonesina puncta Morey 



Menard-Vienna Species 



Healdia exilis n. sp. 



Healdia goniapleura Croneis and Bristol 

 ^Glyptopleurina oehersi (Croneis and 

 Bristol) 

 Kirkbya fossula Croneis and Bristol 



Vienna formation. — Only eight restricted 

 species are found in the Vienna, six of which 

 are new. Of the eight, four are recognized 

 easily, namely, Healdia vinitaensis Harlton, 

 Platychilus ovoides n. sp., Glyptopleurina 

 iniqua n. sp., and Sansabella parallela n. sp. 

 Cavellina parva, Polytylites diversuSj and 

 Moorites brevis, all new species, complete 

 the Vienna list. 



Menard formation. — At least five of the 

 19 restricted species in the Menard form 

 good index fossils. Bairdia brevis Jones and 

 Kirkby has an unusually high dorsum, a very 

 long dorso-posterior slope, and a low, sharp 

 posterior termination. Bairdiolites fornica- 



