PLATE CXXVIIL 



GONIATITES 8INDOSU8. 



Page 40. 

 Fig-. 1. Lateral view of a large well-preserved specimen, retaining the test ami ornaments over the grand 



chamber, and showing the suture-lines of the septate portion. 

 Fig. 'J. The internal mould of a portion of the outer volution of an example, showing a somewhat broader 

 saddle in the middle of the lateral face, than the preceding. Indications of the strong lamellose 

 linos of the ornamentation are preserved toward the periphery of the chamber of habitation. 

 Portage group. Ithaca, Tompkins county. 



GONIATITES IXION. 

 Page 40. 

 Fig. 3, Longitudinal section, showing the depth of the air-chambers, and where the section is through the 

 median line, the reflection and extension of the septa for the passage of the siphuncle is also 

 shown. 



(Joniatite limestone. Rockford, Indiana. 



GONIATITES OWENI. 



Page 40. 

 Fig. 4. Longitudinal section of a large example similar on the exterior to fig. 7, pi. 73, Pal. N. Y., vol v, 



pt. ii, showing the great extent of the chamber of habitation as presented in this species. 

 Fig. 5. Id. Of a small individual, showing the septate portion to the initial extremity. The chamber of 



habitation appears to occupy the greater part of the outer volution as preserved. 

 Fig. tj. Id. Through the median line, showing the space between the termination of the septa and the 



inner wall of the shell, for the passage of the siphuncle. 

 Fig. 7. III. Similar to the preceding, but showing the siphuncular tube indicated by a difference in the 

 color of the material filling the air-chambers. The walls of the siphuncle as thus indicated are 

 not calcareous, but form an organic connection between the septa, 

 Goniatite limestone. Rockford, Indiana. 



