﻿PLATE LXXIV. 



Concavnm-zone. 



Fig. 1. — Sonninia cost ata, 8. Buchnan. 



Fig. 1. — Side view of a well-ribbed form with test. 1 Bradford Abbas, Dorset. 

 My Collection. Two-thirds natural size. (Page 338.) 



Figs. 2, 3. — Sonninia pakvicostata, S. Buchnan. 



Fig. 2. — Side view of a young example with well-preserved test. Bradford 

 Abbas. My Collection. (Page 339.) 

 Fig. 3. — Front view of the same shell. 



Figs. 4 — 6. — Sonninia spiniobba, 8. Buchnan. 



Fig. 4. — Side view of a presumably adult example, showing reclining ribs 

 practically obsolete on the outer third of the whorl. Bradford Abbas. My 

 Collection. Natural size. (Page 335.) 



Fig. 5. — Front view of the same shell. 



Fig. 6. — Part of the suture-line, showing unsymmetrical superior lateral lobe. 



1 The reclining ribs of the penultimate whorl are somewhat incorrectly placed, are too pro- 

 nounced, and too sloped. They are due to an injury. 



