﻿PLATE XLIII. 



Jurense-zone (Dumortieria-beds). 

 Figs. 1 — 4. — Dumortieria eadians (Beinecke). 



Fig. 1. — Inner whorls, natural size. Fig. 1 a, side view enlarged three times, 

 showing the commencement of the ribbing ; 1 b, front view, showing the smooth, 

 rounded ventral area and circular aperture; 1 c, suture-line. (Page 251.) 



Fig. 2. — Inner whorls (fig. 1 with a piece added), natural size. Fig. 2 a, 

 side view enlarged three times ; 2 b, front view ; 2 c, suture-line. 



Fig. 3. — Inner whorls with additional pieces, natural size. Fig. 3 a, side view, 

 enlarged twice, showing finer ribbing ; 3 b, front view, showing more compressed 

 whorls with commencement of carina. 



Figs. 4> a, b. — Side and front views of the complete specimen, by breaking up 

 of which the specimens for figs. 1, 2, 3, were obtained. Cam Down. My 

 Collection. 



Opalinum-zone (Moorei-beds). 

 Figs. 5 — 7. — Dumortieria radiosa (Seebach). 



Fig. 5. — Side view of a large specimen showing coarse ribs in the inner 

 whorls, which whorls are somewhat tumid. Penn "Wood. My Collection. 

 (Page 253.) 



Fig. 6. — Outline of the front view. 



Fig. 7. — Suture-line of the same specimen. 



Opalinum-zone (Moorei-beds). 

 Figs. 8—10. — Dumortieria subundulata (Branco), var. 



Fig. 8. — Side view of a fine example with greater portion of test preserved. 

 Shelly beds of the Yeovil Sands, Stoford, Somerset (Yeovil Junction). From my 

 father's Collection. (For other examples see PI. XLV.) 



Fig. 9. — Front view of the same specimen. 



Fig. 10. — Suture-line of the same specimen. 



Figs. 11 — 13. — Dumortieria radians, var. exigua (S. Buckman). 



Fig. 11. — Side view of a specimen with test. Penn Wood. My Collection. 

 (Page 252.) 



Fig. 12. — Front view in outline. 



Fig. 13. — Suture-line from another specimen. 



