EXPLANATION OF PLATE LXX. 



Figs. 1-4. SYRINGOTHYRIS TEXTUS (Hall; p. 399 



Posterior, anterior, brachial and lateral views of a nearly com- 

 plete specimen. (W. M., No. 3275.) 



Knobstonc formation, New Providence, Indiana. 



Fig. 5. SYRINGOTHYRIS SOLIDIROSTRIS n. sp p. 403 



View of the cardinal area and the interior of a pedicle valve, 

 the holotype. (W. M., No. 12814.) 

 Kcokuk limestone, Kcokuk, lou'a. 



Figs. 6-15. SYRINGOTHYRIS MISSOURI Hall and Clarke p. 393 



6-9. Anterior, posterior, brachial and lateral views of the holo- 

 type. (W. M., No. 11954.) 



Choutcau limestone, Choutcau Springs, Missouri. 

 10-13. Anterior, posterior, brachial and pedicle views of a nearly 

 complete specimen. 14-15. Posterior and lateral views of 

 another specimen. (W. M., No. 13957.) 



Chouteau limestone, Dogtown Creek, Calhoun Co., Illinois. 



156 



