PLATE XIII. 



Fig. 



1. Pteroceras Wrightii,jy. 105. (In Dr. Wright's collection.) 



2. Ammonites gracilis, and Plate I, fig. 3, pp. 12 and 105. 



2. front view. (In Prof. J. Buckman's collection.) 



3. Alaria paradoxa, and Plate III, figs. 9, 10, p. 20. 



4. Alaria pagoda, and Plate III, fig. 18, p. 18. 

 4a. magnified view. 



5. Neritopsis varicosa, and Plate XI, fig. 20, p. 106. 



6. Trochus spiratus, and Plate X, fig. 2, var.,p. 106. 

 6a. . magnified view. 



7. Trochus squamiger, and Plate IX, fig. 34, p. 62. Magnified view of a por- 



tion of the surface. 



8. Ceritella unilineata, and Plate V, fig. 13, p. 38. 



9. Rissoina? acuta, and Plate IX, fig. 9, p. 53. 



10. Nerinea Eudesii, and Plate VII, fig. 6, p. 33. Section of interior. 



11. Nerinea Voltzii, and Plate VII, fig. II, p. 32. Section of interior. 



