PLATE XIV. 



PAGE 



Pig. 21 a. Septum of Ptychoceras (Hamites?) quadratus. 74 



Pig. 22. Heltcoceras Brewerii. 72 



Natural size. 



a. Dorsal view. 



b. Septum, showing the unsymmetrical character of the upper and 



lower sides. 



Pig. 23. ? Ammonites Cooperii. 69 



Natural size. 

 a. Septum. 



Fig. 24. Crioceras (? ancyloceras) Remondii. 75 



a. Section of volution. 



Fig. 25 b. Septum of C. latus. 76 



Fig. 27 b. Septum of Baculites Chicoensis. 80 



Fig. 28 b. Septum of Baculites. 80 



Sp. indet. 



Fig. 29. Baculites Chicoensis. 80 



Variety. 

 a. Section of same. 



Fig. 17 c. Ammonites Chicoensis. 68 



One of the original specimens. 



