EXPLANATION OF PLATE LXXI. 



Figs. 1-2. SYRINGOTHYRIS TEXTUS (Hall) p. 399 



Anterior and posterior views of a nearly complete internal cast. 

 (W. M., No. 7915.) 



Residual chert, Jasper County, Missouri. 



Figs. 3-7. SYRINGOTHYRIS SUBCUSPIDATUS (Hall) p. 401 



Anterior, brachial, lateral, posterior and pedicle views of a nearly 

 perfect specimen. (W. M., No. 8634.) 

 Keoknk limestone, Warsaw, Illinois. 



Figs. 8-9. SYRINGOTHYRIS? sp. 



8. Posterior view of a nearly complete specimen. 9. Anterior view 

 of another example. (W. M., No. 13964.) 

 Hannibal sandstone, Louisiana, Missouri. 



158 



