RANGE OF CHESTER OSTRACODES 



11 



tus n. sp. has a very highly arched dorsum, 

 is comparatively short, and has a short but 

 somewhat sharp posterior end. Paracavellina 

 ovata n. sp. is the shortest species so far 

 recognized in this genus. G, kayi Croneis 

 and Bristol can be distinguished from other 

 species of Glyptopleura by the ribs which 

 are concave upward just below the pit. 

 Kirkbyella truncata possesses a prominent 

 vertical furrow across the posterior end. 



Species Restricted to the Menard 

 Formation 



*Bairdia brevis Jones and Kirkby 



Bairdia dellcata Morey 

 *Bairdiolites fornicatus n. sp. 

 Macrocypris acuminata n. sp. 

 Macrocypris chapmani Croneis and Bristol 

 Cavellina dispar n. sp. 

 ^Paracavellina ovata n. sp. 



Glyptopleura carrolli Croneis and Bristol 

 *Glyptopleura kayi Croneis and Bristol 

 Glyptopleura resupinata Croneis and 



Bristol 

 Ectodemites monomastadis (Coryell and 



Sohn) 

 Ectodemites parvus n. sp. 

 *Kirbyella truncata n. sp. 

 Polytylites concavus (Croneis and Bristol) 

 Jonesina lalickeri Croneis and Bristol 

 Carboprimitia campa n. sp. 

 Clore formation. — The genus Glypto- 

 pleurdj which reaches its maximum develop- 

 ment in the upper Elvira, has eight species 

 restricted to the Clore. The most distinctive 

 of these is the rectangular G. inoptina Girty, 

 first described from the Fayetteville shale of 

 Arkansas. This species is readily differenti- 

 ated by its characteristic lateral outline, 

 large overlap, and by the median rib which, 

 instead of ending at the pit, bends upward 

 and around the pit, joining the rib next 

 above it. Other particularly distinctive spe- 

 cies are G. multicostata Morey, G. sagae 

 Coryell and Johnson and G. tyri (Coryell 

 and Johnson), 



Other distinctive forms not known out- 

 side of the Clore are Beyrichiopsis bryfihil- 

 daCj B. thorij Sargentina allani and Loch- 

 riella fenriri, all described by Coryell and 

 Johnson. Polytylites reticulatus n. sp. may 

 be recognized by the high position of the 

 inner carina. The Clore also has a large 

 number of Amphissitinae, which however, 

 are difficult to distinguish specifically and 

 therefore are not good index fossils. 



Species Restricted to the Clore 

 Formation 



Bairdiolites ovatus Croneis and Funk- 

 house r 

 Bythocypris amsdenensis Morey 

 *Beyrichiopsis brynhildae Coryell and 



Johnson 

 *Beyrichiopsis thori Coryell and Johnson 

 Cavellina congruens n. sp. 

 Cavellina hoeniri Coryell and Johnson 

 Cavellina ithunnae Coryell and Johnson 

 Cavellina librata n. sp. 

 ^Sargentina allani Coryell and Johnson 

 Glyptopleura alata Croneis and Funk- 



houser 

 Glyptopleura elongata n. sp. 

 Glyptopleura friggae Coryell and Johnson 

 ^Glyptopleura inoptina Girty 

 *Glyptopleura multicostata Morey 

 ^Glyptopleura sagae Coryell and Johnson 

 Glyptopleura similis Croneis and Funk- 

 houser 

 *Glyptopleura tyri (Coryell and Johnson) 

 Balantoides moreyi Croneis and Funkhouser 

 Kirkbya marginata Croneis and Funkhouser 

 *Polytylites reticulatus n. sp. 

 Gillina vitharri Coryell and Johnson 

 Jonesina odini Coryell and Johnson 

 Jonesina spinosa Croneis and Funkhouser 

 Kloedenellina heimdalli Coryell and John- 



. son 

 Lochriella fenriri (Coryell and Johnson) 

 Lochriella reversa (Morey) 

 Perprimitia sigynae (Coryell and Johnson) 

 Sansabella lenticularis n. sp. 

 Sansabella njorthi (Coryell and Johnson) 

 Paraparchites ovatus n. sp. 

 Carboprimitia longula n. sp. 

 Primitia cestriensis caldwellensis Ulrich 

 Primitia subaequata Ulrich 

 Kink aid formation. — The Kinkaid, like 

 the Clore, contains numerous species of the 

 Amphissitinae and Glyptopleura. The for- 

 mer contains the species Amphissites exiguus 

 n. sp., A. rugosus Girty, and Ectodemites 

 primus n. sp., which have the variant char- 

 acteristics necessary to form good horizon 

 markers. Six species of Glyptopleura are 

 restricted to the Kinkaid, G. alvea n. sp. 

 being the most easily recognized by reason 

 of its flattened dorsum and the few thin 

 costae. Other restricted species, all new, in- 

 clude the large thick Acratia tumida, the 

 long slender Bairdia aculeata, and Sargen- 

 tina asulcata. Kirkbya bifrons and Deloia 

 serrata, described by Croneis and Thurman, 

 are also thought to be good horizon markers.. 



*Species of probable correlative value. 



* Species of probable correlative value. 



