Figs. 31-34. CHONETES CHESTERENSIS n. sp p. 83 



33-34. Pedicle and brachial views of a nearly complete specimen. 

 Cotype. (W. M., No. 7693.) 



Chester group, Monroe County, Illinois. 



31-32. Pedicle and brachial views of a nearly complete specimen. 

 Cotype. (W. M., No. 14761.) 



Chester group, St. Clair County, Illinois. 



Figs. 35-42. CHONETES GENICULATUS White p. 92 



35-38. Pedicle views of four nearly complete individuals. 

 39-42. Views of the same four individuals from the brachial 

 side. (W. M., No. 6727.) 



Louisiana limestone, Louisiana, Missouri. 



Figs. 43-46. CHONETES LOGANI Norwood & Pratten p. 84 



43-44. Views of two pedicle valves. 45-46. Views of two brachial 

 valves. (W. M., No. 13941.) 



Kinderhook oolite, bed No. 6, Burlington, Iowa. 



Figs. 47-49. CHONETES GLENPARKENSIS Weller p. 87 



Views of three pedicle valves. (W. M., No. 9721.) 



Chouteau limestone, Pcttis County, Missouri. 



Figs. 50-55. CHONETES sp. 



50-52. External views of three somewhat worn pedicle valves. 

 53. Exterior view of a brachial valve. 54-55. Internal views 

 of two brachial valves. (W. M.. No. 11354.) 

 Glen Park limestone, Glen Park, Missouri. 



Figs. 56-57. CHONETES sp. 



56. View of the impression of the exterior of a brachial valve. 

 57. View of a pedicle valve. (W. M., No. 13945.) 

 Kinderhook, bed No. 3, Burlington, Iowa. 



Figs. 58-62. CHONETES PLANUMBONA Meek & Worthen p. 94 



58-59. Pedicle and brachial views of a nearly perfect individual. 

 60-61. Similar views of a second example. 62. Brachial view 

 of a third specimen. (W. M., No. 7684.) 



Kcokuk, Ste. Gencvieve County, Missouri. 



Figs. 63-70. CHONETES ILLINOISENSIS Worthen p. 81 



63. Pedicle view of a nearly perfect valve. 64. View of a group 

 of shells, one of which is illustrated separately as fig. 63. 

 (W. M., No. 14380.) 



Burlington limestone, Boonevillc, Missouri. 



65. Pedicle view. 66. Brachial view. 67. View of the interior 

 of a brachial valve. (W. M., No. 2968.) 



Burlington limestone, Springfield, Missouri. 



68. Pedicle view. 69. Brachial view. 70. View of the interior 

 of a brachial valve. (W. M., No. 2969.) 



Keokuk limestone, near Springfield, Missouri. 



Figs. 71-72. CHONETES GREGARIUS Weller p. 91 



Views of two pedicle valves. (W. M., No. 13944.) 

 Kinderhook, bed No. 3, Burlington, Iowa. 



Fig. 73. CHONOPECTUS FISCHERI Norwood & Pratten p. 96 



View of a very perfect pedicle valve. (W. M., No. 6657.) 

 Kinderhook, bed No. 3, Burlington, Iowa. 



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