﻿PLATE LVII. 



Goneavum-zone. 

 Figs. 1, 2. — Sonninia crassispinata, S. Buchman. 



Fig. 1. — Side view of an adult specimen, showing the persistence of the 

 spines. 1 Bradford Abbas, Dorset. From my father's Collection. (The plate is 

 a copy of a photograph, an enlargement from a quarter-plate negative, and is of 

 the exact size of the original fossil. For outline section of penultimate whorl 3 

 see PI. LXV, fig. 5.) (Page 317.) 



Fig. 2. — Suture-line showing the cruciform superior lateral lobe. The letters 

 a, a indicate the positions of the spines. 



1 There are ribs and spines on other side of part shown as matrix (see text). 



2 The inner whorls are evidently nearly circular, the penultimate is nearly quadrate, and the 

 shape changes to gibbous-sided oblong during the last turn. 



