TAB. II. 



la — g. Beloptera Belemnitoidea, p. 36. 



a. Ventral aspect. 



b. Dorsal do. 



c. Side view. 



d. Longitudinal section. 



e. Magnified view of do. 



f. Ventral aspect of variety. 



g. Dorsal aspect of do. 



2a — e. Beloptera Levesquei, p. 37. 



a. Ventral aspect] 



b. Side view \ of a young specimen. 



c. Dorsal aspect J 



d. Side view of an adult specimen. 



e. Ventral aspect of ditto. 



3a— e. Belemnosis plicata,j». 40. 



a. Dorsal aspect, nat. size. 



b. Side view (enlarged) of the umbonal pore. 



c. Ventral aspect enlarged. 



d. Side view, nat. size. 



e. Ventral aspect, ditto. 



