PLATE XXII. 



Humphriesianum-zone. 

 Figs. 1 — 22. — Pcecilomorphus cycloides (d'Orbigny). 



Fig. 1. — Side view of a somewhat compressed form with moderately large umbilicus. The sigmoidal 

 termination is shown ; and the cross marks the last suture. Test extremely well preserved. Oborne, near 

 Sherborne, Dorset. My Collection. (Page 117.) 



Fig. 2. — Back view of the same specimen, showing the furrowed ventral area. 



Fig. 3. — Side view of a less compressed form with smaller umbilicus. Nearly all the body-chamber 

 present (the cross indicating the position of the last suture). Sherborne, Dorset. Collected by my father. 



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



Fig. 5. — Side view of a compressed form with very small umbilicus. This variety is very scarce. The 

 specimen is not too well preserved. From the lower part of the hard irony band, Wyke Quarry, Sher- 

 borne, Dorset. My Collection. 



Fig. 6. — Front view of the same specimen. 



Fig. 7. — Side view of a specimen with about half a whorl of body-chamber present. Sherborne, Dorset. 

 Collected by my father. 



Fig. 8. — Front view of the same specimen. 



Fig. 9. — Side view of a specimen with unequal-sized ribs. Half a whorl at least of body-chamber present, 

 and possibly more. Sherborne, Doi'set. Collected by my father. (Page 119.) 



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



Fig. 11. — Side view of another variety with small umbilicus. The mouth-border is shown, and the 

 change of the ribs into fine lines of growth on the body-chamber. Oborne, Dorset. My Collection. 



Fig. 12. — Back view of the same specimen, illustrating a more rounded ventral area and nearly absent 

 furrows. (The carina on the upper part is shown too clearly.) 



Fig. 13. — Side view of a very thick variety with small umbilicus. The mouth-border is preserved com- 

 pletely. Sherborne, Dorset. Collected by my father. (Page 119.) 



Fig. 14. — View of the top part of the mouth-border, to show the bluntly-pointed ventral process retain- 

 ing the carina and f urrows. 



Fig. 15.— Side view of a very thick variety. Test very poorly preserved. The iron band, Wyke Quarry, 

 near Sherboi-ne, Dorset. My Collection. 



Fig. 16. — Front view of the same specimen. 



Fig. 17. — Side view of a thick variety with small umbilicus and coarse, irregular-sized ribs. Oborne, 

 Dorset. My Collection. 



Fig. 18. — Back view of the same specimen. 



Fig. 19. — Side view of a young specimen of the thick form. Wyke Quarry, Sherborne. My Collection. 

 (Page 119.) 



Fig. 20. — Front view of the same specimen. (Figs. 19 and 20 are inserted to show that the young 

 specimens of the thick forms are themselves thick and fairly involute.) 



Fig. 21. — Side view of an evolute, compressed variety. Louse Hill, near Sherborne, Dorset. My Col- 

 lection. (Page 119.) 



Fig. 22. — Front view of the same specimen. ( Figs. 21 and 22 are introduced to demonstrate that this 

 variety is distinct in itself, and is not the young state of any of the others.) 



Sauzei-zone. 

 Figs. 23 — 29. — PfficiLOMORPHtrs macer, 8. Buckmcm. 



Fig. 23. — Side view of a very nicely preserved specimen with a perfect mouth-border. The last suture is 

 not visible, but the portion of test absent reveals that the body-chamber is over 0'60 of a whorl in length. 

 Oborne, Dorset. My Collection. (Page 116.) 



Fig. 24. — Front view of the same specimen. 



Fig. 25. — Side view of another specimen a trifle thicker. Oborne. My Collection. 



Fig. 26. — Front view of the same specimen. 



Fig. 27. — Side view of a thicker specimen with coarser ribs, and a deeper umbilicus. Oborne. My 

 Collection. 



Fig. 28. — Front view of the same specimen. The aperture is drawn rather too narrow. 



Fig. 29. — Suture-line taken from another specimen. 



Variabilis-subzone. 

 Figs. 30, 31. — Hildoceras BIFRONS (Bruguiere) variety. 

 Fig. 30. — Side view of a compressed, involute variety. A young specimen with very fine ribs on the 

 outer area and a smooth middle. Bed No. 17, Coaley Wood, Gloucestershire. My Collection. (Page 112.) 

 Fig. 31. — Front view of the same specimen, to show the compression. 



Humphriesianum -zone. 

 Figs. 32, 33. — Lillia sulcata, S. Buchman. 

 Fig. 32.— Side view of well-preserved specimen. Bradford Abbas, Dorset. My Collection. See Plate 

 XXIII, fig. 1. (Page 109.) 



Fig. 33. — Front view of the same specimen, showing the quadrangular aperture and the furrowed ventral 

 area. 



Fig. 34. — Sonninia, sp. 

 Fig. 34. — Suture-line, taken from a specimen in the Bristol Museum. Obtained at Dundry Hill, 

 Somerset. At first thought to belong to the species above. See Plate XXIII, figs. 7, 8. (Page 110.) 



Variabilis-subzone. 



FigS. 35, 36. — iNCERTiE SEDIS. 



Fig. 35. — Side view. The test present on the greater portion, but the sandy matrix has destroyed its 

 sharpness. The absence of ventral furrows shows that this is not a Pcecilomorplius ; and this deficiency, 

 together with the sigmoidal ribs, that it is not a Lillia. It has very great resemblance to Haagia Ogerieni, 

 (Plate XXIII, figs. 16, 17), but has a small solid carina. We must await more specimens before coming to 

 a decided conclusion. North Nibbley, Gloucestershire. My Collection. 



Fig. 36. — Front view, showing sharpened ventral area without any trace of furrows. 



