6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 78 



Ozarkian: 



Lower Breton ian. 



Division C36 {Peltura zone). 

 Division C3a {Parabolina zone). 

 Cambrian ■ 



Middle Cambrian (St. John group — Johannian division of 

 Matthew, 1903.) 

 Division C2c. 



Division C26 (Forchhammeri zone 3A, 3^, 10s, 307^) Beyri- 

 chona triceps, Hipponicharion confluens, H. parvum, 

 H. plicatum. 

 Division C2a. 

 Middle Cambrian (St. John group- Acadian division of Matthew, 

 1903, Paradoxides <.ones). 

 Division Clc^ {Lepiditta curia). 



Division Clcl, Clc2 (2/, 2s) {Alutaflexilis, Beyrichona tinea, 

 Indiana dermatoides, I. acadica, I. matthevn, I. primaeva, 

 Lepiditta alata, L. auriculata, Lepidilla anomala.) 

 Lower Cambrian (St. John group, Hanfordian division of Van 

 Ingen, 1914, Protolenus zone) 

 Division Cl65. 



Division Cl64 (Beyrichona papilio, B. tinea). 

 Division Cl63 {2i, 2k) {Beyrichona benepuncta, B. cambrica, 

 B. minor, B. oculata, B. papilio, B. rotundata, B. tinea, B. 

 tinea planata, B. tinea triangula, Hipponicharion cavatum, 

 H. minus, Indiana dermatoides, I. lippa, I. longula, I. 

 matthewi, I. primaeva, I. pyriformis, I. secunda, Lepiditta 

 sigillata, Mononotella Jusijormis). 

 Division Cl62 {2h, 301) (Beyrichona ovata, B. papilio, B. 

 rotundata, B. tinea, B. tinea planata, Entomidella buprestis, 

 Indiana secunda, Bradoria primaeva). 

 Division Cl6l (2gr) (Beyrichona tinea planata, Bradoria au- 

 rora, B. robusta, B. steadi, Leperditia ventricosa, Hipponi- 

 charion eos, H. cavatum). 

 Lower Cambrian (Etcheminian, Matthew, 1903). 



Division E3/ (13m, 13n, 344c?) (Beyrichona rutellum, Bradoria 

 acuta, B. robusta, B. scrutator, Indiana lippa, Mononotella 

 fusiformis). 

 Division E3e (13n') (Bradoria acuta, B. ovalis, B. robusta, 

 B. rugulosa, B. scrutator, B. spectator, B. vigilans, Indiana 

 lippa, Schmidtella pervetus). 

 Division ESd (137i'', 3446) (Bradoria acuta, B. benepuncta, 

 B. elongata, B. obesa, B. robusta, B. scrutator, B. spectator 

 spinosa, B. vigilans, B. vigilans concentrica) . 

 Division E5c (344a) (Bradoria scrutator, B. acuta). 



