PLATE XV. 



Sowerbyi-zone (Concavum-beds) ? 



Tigs. 1, 2. — Lioceeas decipiens, var. simile, S. Buckman. 



Fig. 1. — Side view of a specimen with well-preserved test. Locality unrecorded ; probably from 

 near Sherborne. Collected by my father. (Page 32.) 

 Fig. 2. — Front view of the same specimen. 



Concavum-beds. 



Figs. 3, 4. — Lioceeas apeetum, 8. Buckman. 



Fig. 3, — Side view of a specimen with greater portion of body-chamber, showing V-shaped ribs 

 scarcely perceptible on the inner area. Bradford Abbas, Dorset. My Collection. (Page 76.) 

 Fig. 4. — Front view of the same specimen. 



Figs. 5, 6. — Lioceeas concavum (Sowerby) variety. 



Fig. 5. — Side view of a specimen showing the whorl receding from the regular coil because of the 

 presence of a large portion of the body-chamber, and thus causing it to somewhat resemble Lioc. 

 apertum, to compare with which it is here figured. Bradford Abbas. Collected, by my father. 

 (Page 72.) 



Fig. 6. — Front view of the same specimen, to compare with fig. 4. 



Figs. 7 — 10. — Lioceeas apeetum, S. Buckman. 



Fig. 7. — Side view of a young specimen, showing the shape of the ribs. To compare with fig. 14. 

 Bradford Abbas, Dorset. (Page 76.) 



Fig. 8. — Front view of the same specimen, to compare with fig. 15. 



Fig. 9. — A slight variety. Side view, showing part of the lateral process of the mouth-border. 

 Bradford Abbas, Dorset. My collection. (Page 76.) 



Fig. 10. — Back view of the same specimen. 



Figs. 11 — 17. — Ludwigia bums, S. Buckman. 



Fig. 11. — Side view of the type specimen, showing bifurcating ribs conspicuous on inner area and 

 slightly produced on ventral area, and the commencement of the lateral process of the mouth border. 

 The x shows the position of the last suture-line. Louse Hill, near Sherborne, Dorset. My Collec- 

 tion. (Page 103.) 



Fig. 12. — Front view of the same specimen. 



Fig. 13. — Side view of a somewhat more compressed specimen, with a larger umbilicus, showing part 

 of the termination. Louse Hill. My collection. 



Fig. 14. — Side view of a young typical specimen, showing the coarse bifurcating ribs conspicuous 

 on the inner area. To compare with fig. 7. Bradford Abbas, Dorset. 



Fig. 15. — Front view of the same specimen, to compare with fig. 8. 



Fig. 16. — Side view of a wide-centred variety. The ends of the ribs are not turned sufficiently 

 towards the front, and the ribs are too much V-shaped. Locality not recorded ; probably from Half- 

 way House, near Sherborne. Collected by my father. 



Fig. 17. — Front view of the same specimen. 



