PLATE CI. 

 Concavum-zone. 



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



Fig. 1. — Side view of a presumably immature shell, wholly testate, wholly 

 septate. Bradford Abbas, Dorset. My Collection. (Page 393.) 

 Fig. 2. — Outline of the whorl-section. 

 Fig. 3. — Suture-line showing symmetry of L. 



Figs. 4 — 6. — Sonninia in^equa, 8. Buckman. 



Fig. 4. — Part of the side view of an immature shell, mostly testate, showing 

 the slight undulate costation. (Page 400.) 



Fig. 5. — Outline of the whorl-section. 



Fig. 6. — Suture-lines showing asymmetry of L, the terminal lobule being intra- 

 axial, anisosceloid. 



Figs. 7 — 9. — Sonninia l^ivigata, 8. Buckman, var. 



Fig. 7. — View of the umbilicus of an immature shell, presumably a variety of 

 8. laevigata. The outer whorl shows practically no ornament. (Page 399.) 

 (Compare PI. LXXXII, fig. 5.) 



Fig. 8. — Outline of the whorl-section. 



Fig. 9. — Suture-line showing asymmetry of L. 



The specimens of the last two species were lately obtained from Stoke Knap 

 (Whaddon Hill), near Beaminster, Dorset, by Mr. E. Wilson, F.G.S., who has 

 kindly allowed me to add them to my cabinet. 



