﻿PLATE LXXI. 



Concavum-zone. 

 Figs. 1 — 3. — Sonninia submarginata, 8. Buckman. 



Fig. 1. — Side view of a portion of a specimen with complete test, showing 

 short spinous stage 1 followed by finely ribbed costate stage. Bradford Abbas. 

 My Collection. Natural size. (Page 329.) 



Fig. 2. — Section of the whorl in outline, with test. 



Fig. 3. — Suture-liue of the same fossil. (It has not been possible to follow 

 the minor denticulations of the suture, as some of the test had to be removed 

 by acid.) 



Figs. 4, 5. — Sonninia subcostata, 8. Buckman. 



Fig. 4. — Side view. Test present. Natural size. Bradford Abbas. My 

 Collection. (Page 330.) (Central spines damaged in cleaning.) 

 Fig. 5. — Section of the whorl in outline, with test. 



Figs. G — 8. — Sonninia substriata, 8. Buckman. 



Fig. 6. — Portion of side view. Test present. Natural size. Bradford Abbas. 

 From my father's Collection (see PI. LXX, figs. 5, 6). (Page 330.) 



Fig. 7. — Section of the whorl in outline, showing rounded ventral area of last 

 whorl and subcarinate area of preceding whorl. Test present. 



Fig. 8. — A part of the suture-line of another specimen. (A copy of a photo- 

 graph nearly natural size.) 



1 The last spine is seen to the right. 



