EXPLANATION OF PLATE XXVI. 



Figs. 1-9. SHUMARDELLA OBSOLENS (Hall) p. 224 



1-3. Brachial, anterior and lateral views of a very perfect shell. 

 4-6. Pedicle, posterior and anterior views of another specimen. 

 7-9. Brachial and two lateral views of three separate specimens. 

 (W. M., No. 9668.) 



Chouteau limestone, Chonteau Springs, Missouri. 



Figs. 10-14. PARYPHORHYNCHUS ELONGATUM Weller p. 191 



Pedicle, brachial, lateral, anterior and posterior views of a very per- 

 fect specimen. (D. K. G., No. 3901.) 



Kinderhook limestone, South Fabius River, southeast cor- 

 ner of Kno.r County, Missouri. 



Figs. 15-22. PARYPHORHYNCHUS STRIATICOSTATUM (Meek & Worthen) .p. 189 

 15-19. Pedicle, brachial, lateral, anterior and posterior views of a 

 nearly perfect specimen. (W. M., No. 10784.) 



Kinderhook limestone, Pike County, Illinois. 



20-22. Pedicle, brachial and lateral views of another nearly perfect 

 example. (W. M., No. 6658.) 



Kinderhook, Bed No. 4, Burlington, Iowa. 



Figs. 23-28. PARYPHORHYNCHUS TRANSVERSUM Weller p. 188 



23. View of a nearly perfect pedicle valve. (W. M., No. 10548.) 



Kinderhook sandstone, Kinderhook, Illinois. 



24-28. Pedicle, brachial, anterior, posterior and lateral views of a 

 nearly perfect internal cast. (U. M., No. 1375.) 

 Chonopectus sandstone, Burlington, Iowa. 



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