PLATE C. 



Co?icavum-zone. 

 Figs. 1 — 4. — Sonninia spinipera, 8. BucJcman. 



Fig. 1. — Side view of a nearly wholly septate and nearly wholly testate 

 specimen, presumably adult, showing obsolescence of costae in correlation with a 

 wide umbilicus. The inner whorls are somewhat damaged. The figure is one- 

 half the natural size. Bradford Abbas, Dorset. My Collection. (Page 418.) 

 (For other figures of this species see PI. L, figs. 14, 15 ; PI. LXXIV, figs. 4 — 6.) 



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



Fig. 3. — Portions of two suture-lines of the above specimen taken at a radius 

 of 59 mm., showing asymmetrical L with very abbreviated inner lobule, the terminal 

 lobule intra-axial, anisosceloid, inequicellate. 



Fig. 4. — Portions of two suture-lines taken at a radius of 102 mm., showing an 

 even more pronounced want of symmetry. 



Figs. 5 — 7. — Sonninia cymatbra, 8. BucJcman. 



Fig. 5. — Side view of a presumably nearly adult specimen, reduced to one-half 

 natural size, showing strongly reclinate costae. The central whorls are wanting, 

 and for the purposes of this figure it has been necessary to take details from 

 both sides of the specimen. Bradford Abbas. From my father's Collection. 

 (Page 420.) (For other figures of this species see PI. LXXIII, figs. 2, 3.) 



Fig. 6. — Outline of the whorl-section, of natural size, with test on the peripheral 

 area only. 



Fig. 7. — Portions of two suture-lines, showing very asymmetrical superior lateral 

 lobe, the inner lobule being much abbreviated, the terminal lobule being intra-axial, 

 very anisosceloid, and very inequicellate. 



Fig. 8. — Sonninia acanthodes, 8. Buchnan. 



Fig. 8. — Portions of two suture-lines of the type-specimen figured in PL LX, 

 taken at a radius of 94 mm., 1 showing an asymmetrical L, the lateral lobules 

 being inequipoised, the inner lobule the smaller, and the terminal lobule intra- 

 axial, anisosceloid, and somewhat inequicellate. (Page 419.) 



Fig. 9. — Sonninia revirescens, 8. BucJcman. 



Fig. 9. — Portions of two suture-lines of the type-specimen illustrated in 

 PI. LXX, fig. 1, taken at a radius of 87 mm., 1 showing a nearly symmetrical L, 

 with a slightly bipartite outer lobule, and somewhat anisosceloid terminal lobule. 

 (Page 417.) (Compare PI. XCVII, fig. 5.) 



Fig. 10. — Sonninia crassa, 8. BucJcman. 



Fig. 10. — Portions of two suture-lines of the type-specimen depicted in 

 PI. LXXXII, fig. 1, taken at a radius of 89 mm., 2 showing a nearly symme- 

 trical L, with a bipartite outer lobule, and isosceloid terminal lobule. (Page 398.) 



1 The upper one. 2 The lower one. 



