157 



Polygnathus punctatus. Hinde. (Fig. 43.) 

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

 PL XVII.) 



Distinguishing Characters. — Flat, thin, unsym- 

 metrical form ; keel produced, but not reaching tip fto.48. i>oiy- 

 of plate, with two or three nodes; surface of plate tatus, x is (at 



. ter Hinde). 



minutely tuberculated. 



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

 1(?). (Hinde.) 



Polygnathus linguiformis. Hinde. 

 (Fig. 44.) (Quart. Jour. Geol. Soc, Vol. 

 XXXV., p. 367, PL XVII.) 



Dinting uishing Characters. — E 1 o n g a t e 

 form ; tongue-like, deflected, transversely- 

 ridged process; upward curving sides of 

 plate, with central trough between; keel 

 arising from bottom of trough, produced, 

 with crenulated crest; lateral surfaces 

 tuberculated. 



Found in the Conodont bed of the Genesee, at Section 1 

 (abundant). (Hinde.) 



Polygnathus palmatus. Hinde. (Fig. 45.) (Quart- 

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

 PL XVII.) 



Fig. 44. Polygna- 

 thus linguiformis, x 13 



(after Hinde). 



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. 45. Polygnathus palma- 

 tus, x 18 (after Hinde i. 



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

 Jour. Geol. Soc, Vol. XXXV., p. 367. PL XVII.) 



