PLATE LXXXIII. 
Concavum-zone. 
Figs. 1—4.—Sonninta piversa, S. Buckman. 
Fig. 1.—Side view of the type-specimen. Bradford Abbas. From my 
father’s Collection. (Page 355.) 
Fig. 2.—Front view of the same specimen. (The inner margin is not defined 
enough; and in Figs. 1 and 2 the carina is rather too large.) 
Fig. 3.—Side view of a young example. (The outer whorl is somewhat 
damaged at the end.) Bradford Abbas. My Collection. 
Fig. 4.—Front view. 
Figs. 5—9.—Sonninia ompHALICA, S. Buckman. 
Fig. 5.—Side view, test present. Inner whorls damaged in cleaning. 
Bradford Abbas. From my father’s Collection. (Page 363.) 
Fig. 6.—Front view. The aperture is drawn as it actually is on the specimen : 
a true section would show it more compressed. (Compare fig. 5.) 
Fig. 7.—Suture-line of the same specimen, showing degraded type of septum. 
Fig. 8.—Front view of a young example. 
Fig. 9.—Side view showing the irregular spinous stage. Bradford Abbas. 
My Collection. 
