PLATE XCVII. 



Concavum-zone. 

 Figs. 1 — 3. — Sonninia dominata, 8. Buchman. 



Fig. 1. — Side view, reduced to one-half natural size. The test is absent from 

 the body-chamber. Bradford Abbas. My Collection. (Page 408.) 



Fig. 2. — Outline of the whorl-section. One-half natural size. 



Fig. 3. — Portions of the outlines of the last two septa, showing the asymmetrical 

 superior lateral lobe. 



Fig. 4. — Sonninia dominans, 8. Buchman. 



Fig. 4. — A somewhat imperfect sketch of the part of the suture-line of the 

 type dominans figured in PI. LXVI. After clearing away the thick test with 

 great labour this is the best delineation I can give. The minor details have been 

 damaged by the scraping and filing, but the principal details may be trusted. This 

 is given for comparison with fig. 3, and also with the septal outlines shown in 

 PI. XOIV, figs. 2 and 4. It will be noticed that the lobes are long, and the 

 terminal lobule of L is ecto-brachysceles. (Page 435.) 



Fig. 5. — Sonninia, sp. 



Fig. 5. — Sketch of the suture-line of a specimen which is, by comparison with 

 8. dominans, only half-grown. It is a shell almost similar to that species, and the 

 suture-line is here given for comparison therewith. (Page 440.) 



Figs. 6 — 8. — Sonninia plicata, 8. Buchman. 



Fig. 6. — Side view reduced to two-thirds of natural size, showing the unequal- 

 sized ribs — a feature hardly so clearly brought out in the drawing as it might be. 

 The central whorls, damaged on the side shown, bear evidence of a regular spinous 

 stage on the other. Bradford Abbas, railway-cutting. My Collection. (Page 415.) 



Fig. 7. — Front view. 



Fig. 8. — Septal margins showing an asymmetrical L, the terminal lobule ani- 

 sosceloid, the lateral lobules short, not equipoised. 



