PLATE CXXVIII. 
Goniatites sinuosus. 
Page 40. 
1. Lateral view of a large well-preserved specimen, retaining the test and ornaments over the grand 
chamber, and showing the suture-lines of the septate xiortion. 
2. 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 
lines of the ornamentation are preserved toward the periphery of the chamber of habitation. 
Portage gi’oup. Ithaca, Tompkins coujity. 
Goniatites Ixion, 
Page 40. 
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. 
Goniatite limestone. Rockford, Indiana. 
Goniatites Oweni. 
Page 40. 
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 gi’eat extent of the chamber of habitation as presented in this species. 
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. 
6. 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. 
7. Id. 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 ai'e 
not calcareous, but form an organic connection between the septa. 
Goniatite limestone. Rockford, Indiana. 
