EXPLANATION OF PLATE XXII. 



Figs. 1-6. SCHIZOPHORIA SWALLOVI (Hall) p. 167 



1. View of a very perfect pedicle valve. (W. M., No. 7916.) 



Burlington limestone, Springfield, Missouri. 



2. Similar view of another pedicle valve. 3. View of a small 

 brachial valve. (W. M., No. 7861.) 



Burlington limestone, Henderson County, Illinois. 

 4-5. Brachial and posterior views of a nearly complete but some- 

 what crushed example. (W. M., No. 7862.) 



Burlington limestone, Burlington, Iowa. 

 6. View of internal cast of a pedicle valve. (W. M., No. 14233.) 



Chert of Burlington limestone, Sedalia, Missouri. 



Figs. 7-14. SCHIZOPHORIA POSTSTRIATULA n. sp p. 165 



7-11. Pedicle, brachial, anterior, posterior and lateral views of a very 

 perfect, but somewhat unsymmetrical specimen. Cotype. (D. 

 K. G., No. 2701.) 



Fern Glen formation, Fern Glen, Missouri. 



12-13. Pedicle and posterior views of a nearly complete but some- 

 what crushed example. 14. View of the interior of the rostral 

 portion of a pedicle valve. Cotypes. (W. M., No. 4693.) 

 Fern Glen formation, near Kinimswick, Missouri. 



Figs. 15-17. SCHIZOPHORIA POSTSTRIATULA n. sp. (?) p. 165 



Brachial, pedicle and posterior views of a nearly complete but 

 somewhat crushed specimen. (W. M., No. 8553.) 

 Pierson limestone, near Springfield, Missouri. 



50 



