156 



Fig, 39. 

 Polygnathus 

 pennatus, x 



1 3 ( a tief 

 Hinde). 



PLATES. 



Polygnathus pennatus. Hinde. (Fig. 39.) (Quart. Jour. 

 Geol. Soc, Vol. XXXV.. p. 366, PI. XVII.) 



Distinguishing Characters. — Elongate, oval out- 

 line: depressed longitudinal furrow: slender cen- 

 tral keel, produced beyond main portion, and 

 bearing tubercles ; lateral ridges. 



Found in the Conodont bed of the Genesee, at 

 Section 1 (abundant). (Hinde.) 



Polygnathus tuberculatum. Hinde. 

 ( Fig. 40.) (Quart. Jour. Geol. Soc, 

 Vol. XXXV.. ]». 366, PI. XVII.) 



Distinguishing- Characters — I a >bate 

 form: produced and tuberculated cen- 

 tral keel : converging rows of tubercles ; 

 reverse side smooth. 

 c Iiatvi% lflaft^Hin'uM.'''' Found in the Conodont bed of the 



Genesee, at Section 1 . ( Hinde. ) 



Polygnathus cristatus. Hinde. (Fig. Jl.) 

 (Quart, Jour. Geol. Soc, Vol. XXXV., p. 366, 

 PI. XVII.) 



Distinguishing Characters.— Oval outline, 

 depressed convex expression: prominent cren- 

 ulated keel; two rows of tubercles on either 

 Poiygna- side of keel. 



Found in the Conodont bed of the Genesee, 

 at Section 1. (Hinde.) 



Polygnathus truncatus. Hinde. 

 (Fig. 42.) (Quart. Jour. Geol. Soc, 

 Vol. XXXV.. ]». 366, PI. XVII.) 



Distinguishing Characters. — Sub-tri- 

 angular outline of plate; median keel, 

 not extended: convex, tuberculated sur- 

 face. 



Found in the Conodont bed of the 



Fig. 41 

 tli us cristatus, x 13 

 (after Hinde). 



Fig. 4 - .'. Polygnathus 

 truncatus ami /'. trunca- 

 tus, var. x I3(after Hinde). 



Genesee, at Section 1. (Hinde. ) 



