﻿PLATE LXV. 



Concavum-zone. 



FigS. 1, 2. SONNINIA MAEGINATA, 8. Bltckman. 



Fig. 1. — Side view of an immature example to compare with immature 

 acanthodes and erassispinata. Bradford Abbas. My Collection. (Page 321.) 

 Fig. 2. — Front view of the same fossil. 



Figs. 3 — 5. — Sonninia orassispinata, 8. Buchman. 



Fig. 3. — Side view of the fossil, showing the irregularly-spined period 

 followed by regular spines on rather more than the last half- whorl. (A copy of a 

 photograph one-half the size of the original fossil.) Bradford Abbas. My 

 Collection. (Page 317.) 



Fig. 4. — A section of the whorl in outline, taken from just after the 

 commencement of the regular-spined period. 



Fig. 5. — A section of the whorl of the specimen figured in PI. LVII. Taken 

 at the same diameter, showing the quadrate shape and broad abdomen. 



FigS. 6, 7. DuMORTIERIA GRAMMOCEROIDES, Haug. 



Fig. 6. — Side view to replace fig. 3 of PI. XL VII, of which the mouth became 

 falsely represented in the printing. (Page 264.) 



Fig. 7. — A portion of the other side, showing the mouth and the test above 

 the furrow — to supplement fig. 6. 



