PSAM. 



790 



probable arrangement of the teeth in the fish's right and left 

 jaws. The specimens were collected at various places, but all 

 from the upper part of the Burlington limestone, XL 



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



Wot. 

 CeoL 



111., Vol. 7, 1883, page 205, plate 14, figs, la, J, c, d ,\ 2a; Sa, 

 J, c ; 4a, J, G ; all from the Upper Burlington limstone, XL 



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



\ StJohnUWoi^Jie7i:GeolJ//, Voiyii^piaUS^ 



111., Vol. 7, 1883, page 206, plate 15, fig. 4a, a maxillary tooth, 

 seen from above, restored; 5, back edge; <?, front edge; d, 

 inner articular edge ; e, outside edge. Des Moines, la. Tipper 

 Burlington Ush-heds, XL 



Fsammodus ? a fish-tooth from the Joggin's coal 



^^ measures on the Bay of Fundy. Dawson's Acad. 

 GeoL, 1368, p. 209, fig. 54 ; one of many such 

 found. XILL 



? part of a fish-tooth from the Keokuk 

 (subcarboniferous) limestone, 

 with ProduGtus punotatus and 

 spirifera Guspidata. Owen,Geol. 

 Wisconsin, etc , pi. 3 A, fig. 20. 

 XL 



Fsammodus 



ow. 



K5a. 



