PLATE LXXVIII A. 



Orthooeras procerus. 



Page 249. 

 See Plate 35, 79. 



Fg\. 1. An individual with moi-e distant septa and larger apical angfle than usual. /Schoharie, N. Y. 



Vig. 2. A smaller septate frag'ment, \vith the suture lines of the septa somewhat oblique from pressure. 

 The appai-ent constriction of the tube is only a break in the continuity of the substance. iScho- 

 harie, N. T. 



Fig. a. A septum of ))receding specimen, showing the excentric siphuncle. 



Fig. 4. An individual retaining the longitudinal keel on the chambere, indicating the ventral side. Scho- 

 harie. N. T. 



Fig. 5. A septum showing the size and position of the siphuncle. An areola, shown on the specimen, is not 

 represented. 



Fig. 6. A small, compressed, chambered fragment, with the septal sutures somewhat curved ; -due to the 

 compi-ession. 



Fig. 7. A septum of preceding specimen showing the siphuncle participating in the general compression. 



Fig. 8. Longitudinal section of an individual. No traces of the siphuncle can be observed. The raised 

 areola on the septum, aronnd the siphuncle, is shown in section at the lower extremity. 



