PLATE LXXI. 



GONIATITES DISCOIDECS. 

 Paga Ml. 

 See Plate 74. 

 Tig. 1. An iniperfecfly preserved specimen. Tally limestone. Smith's ledge, Otiico, N T. 

 Figs. 2, 3. Compressed specimens retaining' the test. From the Marcelhis shales, at Schoharie, N. T. 

 F\g. 4. A small individual retaining its original form. Goniatite limestone. Near Manlius, iV. T. 

 Figs. 5, 6. Two views of another similar specimen. Goniatite limestone. Near Manlius, N. Y. 

 Fig. 7. A larger and slightly compressed specimen, showing surface-marliings and a few imperfect septal 



lines in the smaller i>art of the volution. Hamilton group. Near Cazenovia., N. Y. 

 Figs, fi, 9. Two views of a medium-sized, rotund specimen, showing septal lines, and retaining the test over 



a part of the outer chamber. Goniatite limestone. Near MaiUiiis, JV. Y. 

 Fig. 10. A large imlividual, showing imperfectly a few of the suture-lines and the margin of the aperture. 



Hamilton shales. Near Cayuga lake, N. Y. 

 Pig. 11. An imperfect specimen showing the usual form, and obscurely the septa of this species. Portage 



group. Portland Harbor, N. Y. 

 Fig. 12. An individual showing several air-chambers and obscure lines of growth. Hamilton shales. 



Western New York. 

 Fig. 13. The internal mould of a less compressed specimen showing several air-chambers. Hamilton 



group. Catenovia, N. T. 



€k)NIATITES tJNIANQULARIS. 



PugeiU. 



See Plates 72, 74. 



Fig. 14. Lateral view of the oripnal of Mr. Conrad's description, showing the general form and air-chambers. 



Hamilton group. Near Moscow, N. Y. 



GONIATITES UNILOBATDS. 



Page 438. 



Fig. 15. Lateral view of a small specimen show ing the umbilicus, septal lines, and in part the flattened 



periphery. 

 Fig. 16. The opposite side of the same specimen. Hamilton gi-oup. Norton's landing, Cayiiga lake, N. Y. 



