PLATE 77 
1. 701. 1. Trochoceras gebhardii. ( Pag. 335.) 
1 a. View of the base of the preceding specimen, after the removal of the last volution, showing the direc¬ 
tion of the septa. 
1 6. 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. 
2. 703. 4. Oncoceras expansum. ( Pag. 337.) 
2 a. Lateral view of the specimen. 
2 6. Transverse section, showing the position of siphuncle. 
