EXPLANATION OF PLATE LXVIII. 



Figs. 1-7. SYRINGOTHYRIS HANNIBALENSIS (Swallow) p. 388 



1-5. Posterior, anterior, brachial, pedicle and lateral views of a 

 very perfect exfoliated specimen. (W. M., No. 1086.) 6-7. 

 Interior views of two pedicle valves showing the syrinx. 

 (W. M., No. 13956.) 



Louisiana limestone, Louisiana, Missouri. 



Figs. 8-15. SYRINGOTHYRIS NEWARKENSIS n. sp p. .594 



8-11. Posterior, anterior, brachial and lateral views of a some- 

 what restored specimen. 12-15. Lateral, posterior, anterior 

 and brachial views of another specimen. Cotypes. (D. K. 

 G., No. 3002.) 



Chouteau limestone, Newark, Kno.r County, Missouri. 



152 



