﻿PLATE LXXVI. 



Goncavum-zone. 

 Figs. 1 — 6. — Sonninta magnispinata , 8. Buchman. 



Fig. 1. — Side view of the typical form, showing the large regular spines 

 followed by spines and ribs. Bradford Abbas, Dorset. My Collection. (Page 341.) 



Fig. 2. — Front view of the same shell, showing the size of the spines. 



Fig. 3. — Back view of the same specimen, to illustrate the carina and ventral 

 area. 



Fig. 4. — Side view of an older example, to show the costate stage. Bradford 

 Abbas. From my father's Collection. 



Fig. 5. — Section of the aperture, in outline ; embraced whorl with test, outer 

 whorl without. 



Fig. 6. — The suture-line of the same specimen, showing a rather broad- 

 stemmed, tripartite superior lateral lobe. 



FigS. 7 — 9. SoNNINIA ALTEIvNATA, S. Bncfa)Ulii. 



Fig. 7. — Side view of a young specimen with well-preserved test, showing the 

 peculiarities of the ribbing. (This is the form described as |3, page 345.) Brad- 

 ford Abbas. From my father's Collection. (Page 346.) 



Fig. 8. — Back view, showing the ventrally-projected strioe. 



Fig. 0. — Section of the whorl in outline, test present. 



