PLATE LXXIII. 



GONIATITES OWBNI, VM. FARALLELA.. 



Page 473. 



See Plate 74. 



Fijf. 1. Lateral view of a specimen, showing the directions of the sutui-es an^l the size of the umbiliciu. 



Fig. 2. Ventral view of the same individual, showing' the appi-oximation of the septal lines on each side of 



the ventrum, forming two pai-allel grooves in the cast. Gouiatite limestone. Bockford, Ind. 



GJONIATITBS OWBNI. 



Pago 470. 



See Plate 74. 



Fig. 3. Latei-al view of a specimen of medium size, showing the directions of the sutures and the wide 



umbilicus. 

 Fig. 4. Ventral view of the same, showing features contrasting with those of fig. 2. 

 Figs. 5, 6. Lateral views of two young individr.als. It is possible that fig. 5 may be the young of the 



variety, but it is difficult to determine from such immature examples. 

 Figs. 7, 8. Two larger individuals pi-eserving no ti-aces of septii, and showing the coustnction of the tube at 

 irregular intervals. Goniatite limestone. Mockford, IndiarM, 



GONIATITES LyOMI. 

 Page 476. 

 See Plates 72, 74. 

 Tig. 9. Lateral view of an imperfect specimen restored in pai-t, and showing the gradually enlarging volu- 

 tions and the sinuosities of the septal margins. 

 Fig. 10. A portion of a larger individual preserving the base of the outer chamber. The lobes and saddles 

 of the septa ai-e very imperfectly i-epresentfd in the two pi-eceding figures. The specimens 

 show the apex of each lobe to be tipped with a small mucronate extension. 

 Fig. 11. Ventral view of a fragment, showing the deep acute lobe of the septa on the ventrum. Goniatite 

 limestone. RocJiford, Indiana. 



GONIATITES IXION. 



Page 474. 



See Plate 74. 



Fig. 12. Lateral view of a young individual, showing a more rotund form than in the larger specimens. 



Fig. 13. Lateral view of a lai-ge individual, showing septal lines throughout, and the very small umbilical 



depression. 

 Fig. 14. Front jjrofile view of the same individual, showing the form of the transverse section, the size of 

 the siphuncle, and the mucronate extension of the ventral lobe. Goniatite limestone. Hock- 

 ford, Indiana. 



