787 



FSAM. 



^£j.^'%#^tt W. QrQotJlL VolJ. 1883 ^' fIctta/4 



surface; J, back edge; (?, front edge (many other figures 

 omitted.) Upper Burlington limestone. XI, 



Fsammodus plenus, St. John and Worthen, Geo. Sur. 



111., Vol. 7, 1883, page 213, plate It), ligs. 1«, to 46', and plate 

 17, figs. \a to 4<?, of which I have selected a large tooth be- 

 longing to the St Louis limestone. XL 



Fsammodus porosus P Agassiz. Recherches Poiss. Foss, 





