PLATE IT. 



Ammonites Perezianus (page 19.) 



Figure 1. Side view of the type specimen. 



" 1 a. Outline of aperture of the same. The original being ratlier M'ater-worny 

 tlie periphery is represented as too narrow, when perfect it is rather 

 more broadly rounded. The emargination of the base, too, is not 

 nearly deep enough. 



Am.monites FiLiciNCTUs (page 43.) 



F iure 2. Side view of a small but very perfect individual. 



" 2 a. Another representation of the same, to show the shape of the aperture 

 and siphonal edge. 



" 2 h. Section of do. The edges of the inner walls of the whorls are obliterated. 



" 2 c. Portion of the test of do., magnified. 



" 3. A larger specimen, partly restored. 



