EXPLANATION OF PLATE XIX. 



Fig. 1. Ammonites Losvianus. (Page 201.) 



a. Side view, the outer chamber partly broken away. 



b. Portion of the plan of a septum. 

 Fig. 2. Helicoceras Pariense. (Page 203.) 



a. Upper view of part of one volution. 



6. Dorsal view of part of the same, showing double row of nodes. 



c. Transverse section of the latter through the nodes. 



d. A similar section made between the nodes. 

 Fig. 3. Scaphites Warreni. (Page 200.) 



a. Imperfect example, showing only part of the last turn. 

 Fig. 4. Baculites ovatus. (Page 199.) 



a. Outline of transverse section of outer chamber, near the last septum. 



t. Small example from near Paria, Utah. 



c. Transverse section of the same. 

 Fig. 5. Baculites ovatos var. (Page 200.) 



a. Fragment of the chambered portion. 



h. Transverse section of the same example, about midlength. 



c. Plan of one of the septa. 



