t) ( 



Polygnathus prxrTATUS. Hiiide. (Fig. 43.) 

 (Quart. Jour. Geol. Soc, Vol. XXXV., p. 367, 

 PI. XVII.) 



Distinguishing Characters.— YXni, tliiii, iin.syin- 

 nietrical form ; keel produced, but not reaching- tip fig.43. poiy- 

 of T)late,witn two oi' three nodes: suriace oi plate ^-/«s,xi3(af- 



/ ^ ter Hinde). 



minutely tul)erculated. 



Found at North Evans, in the Genesee shale, at Section 

 1(?). (Hinde.) 



Polygnathus linguifokmis. Hinde, 

 (Fig. 4:-J:.) (Quart. Jour. Geol. Soc, Vol. 

 XXXV.,p. 367, PI. XVII.) 



Distinsuishino- Characters. 



Elongate 



form ; tongue-like, deflected, trans verseh'- 

 ridged process; upward cur\ing sides of 

 plate, with central trough between; keel 

 arising from bottom of trough, ]>i-o(luced, 

 with creiuilated crest; lateral surfaces 

 tuberculated. 



Found in the Conodont bed (jf the Genesee, at Section 1 

 (abundant). (Hinde.) 



Fig. 44. Poh/gaa- 

 Ihus Ihiguiforiitis, x l;i 

 (after Hinde). 



Polygnathus palmatus. Hhide. 

 Jour. Geol. Soc, Vol. XXXV., p. 367, 

 PI. XVII.) 



Distinguishing Characters. — U n - 

 symmetrical, lobed outline ; depressed 

 central portion ; longitudinal and 

 sometimes transverse keel, extending 

 to depressed center; smooth sur- 

 face. 



Found at North Evans, in the Gene- 

 see shale (very abundant ) . ( Hinde. ) 



(Fig. 4.',.) ((]uart. 



FiH. 4.'). Poh/gnathim pnlma- 

 txs, X 13 (after Hinde). 



Polygnathus (?) simplex. Hinde. (Fig. 46.) 

 Jour. Geol. Soc, Vol. XXXV., p. 367, Pl. X^'II.) 



(hi art. 



