594 



NEW YORK STATE MUSEUM 



Barrandecceras natator Billings (sp.) 



Page 454 

 See pi. 32 



I Section of the specimen reproduced on plate 32, showing the 

 depth of the cameras and of the septa, and the size and position 

 of the siphuncle. Crushed septa extend imthe original as far as 

 the single septum in the middle of the last volution where the 

 living chamber apparently began. 



