i 



Fiff. 1. 



PLATE 77 a. 



701. 1. Trochoceras gebhardii. 



( Pag. 335.) 



1 a. View of the base of the preceding specimen, after the removal of the last volution, shoM'ing the direc- 

 tion of the septa. 

 1 b. The base of another specimen, which has the upper portion enclosed in solid limestone. 

 1 c. A transverse section just above the first volution. 

 1 d. A transverse section, about one half or two-thirds of a volution above the aperture. 



Fig. 2. 



703. 4. Oncoceras expansum. 



(Pag. 337.) 



2 a. Lateral view of the specimen. 



2 b. Transverse section, showing the position of siphuncle. 



