﻿PLATE LXVI. 



Concavum-zone. 

 Figs. 1, 2. — Sonninia dominans, 8. Buckman. 



Fig. 1. — Side view of a grand adult specimen to compare with adult marginata 

 (PI. LXIV). It will be seen that the spines are confined to the infantile whorls. 

 Bradford Abbas, Dorset. My Collection. (This view is a copy of a photograph 

 about two-thirds natural size, namely, 193 mm. [7| inches] against 302 mm. 

 [11| inches], the diameter of the fossil. 1 ) (Page 322.) 



Fia\ 2. — Outline of the front view, two-thirds natural size. 



1 In both measurements allowance is made for the broken piece opposite the x which marks the 

 last suture-line. 



