PLATE XCVIII. 



Concavum-zone. 

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



Fig. 1. — Side view of a specimen with many of the spines preserved intact; 

 also showing nodicostate character of the outer whorl. Bradford Abbas. My 

 Collection. (Page 413.) (Compare PI. LXXVI.) 



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



Fig. 3. — Suture-line showing rather long and narrow-stemmed L, the terminal 

 lobule anisosceloid, the saddles much penetrated by the lobes. 



Figs. 4, 5. — Sonninia subirregularis, 8. Buckman. 



Fig. 4. — Side view of a large specimen. This drawing is a copy from a photo- 

 graph, and is much reduced, being 81 mm. in diameter against 271 mm., the 

 diameter of the specimen. Bradford Abbas. My Collection. (Page 426.) 

 (Compare PI. LXXVII, figs. 6—9.) 



Fig. 5. — Suture-line from a photograph, showing L with slightly anisosceloid 

 terminal lobule, and a slightly bipartite outer lobule. 



Fig. 6. — Sonninia irregularis, 8. Buckman. 



Fig. 6. — Suture-line of the type-specimen figured in PI. LXI, showing con- 

 siderable areas unsupported by lobes. (Page 417.) 



Fig. 7. — Sonninia reclinans, 8. Buckman. 



Fig. 7. — Part of the suture-line of the specimen figured in PI. XLVIII, figs. 16, 

 17, as Sonn. crassispinata, 1 showing the long asymmetrical L with anisosceloid 

 terminal lobule and long lateral lobules, the outer bipartite. (Page 421.) 



1 It is requested that the explanation of PI. XLVIII be altered in accordance. 



