﻿PLATE XLII. 



Jurense-zone (Dumortieria-beds) . 

 Figs. 1 — 12. — Duhortieria radians (Reinecke) . 



Fig. 1. — Side view of a specimen, to compare with Reinecke's figure. Perm 

 Wood, near Stroud. My Collection. (Page 248.) 



Fig. 2. — Front view of the same. 



Fig. 3. — Side view of a fine-ribbed variety without test. Penn Wood. My 

 Collection. 



Fig. 4. — Front view of the same. 



Fig. 5. — Suture-line of the same. 



Fig. 6. — Side view of a compressed variety. Cam Down, near Dursley, 

 Gloucestershire. My Collection. 



Fig. 7. — Front view of the same. 



Fig. 8. — Side view of a thick variety. Cam Down. My Collection. 



Fig. 9. — Back view of the same. 



Fig. 10. — Aperture of the same. 



Fig. 11. — Side view of a variety with distant ribs. Cam Down. My Collec- 

 tion. 



Fig. 12. — Front view of the same. 



Figs. 13 — 15. — Dumortieria radiosa (Seebach). 



Fig. 13. — Side view of a form showing inner whorls comparable to Dum. prisca 

 or Dum. Levesquei, and outer whorl with fine ribbing. Cam Down. My Collec- 

 tion. (Page 253.) 



Fig. 14. — Front view of the same, showing the variation in the shape of the 

 whorls at different times. 



Fig. 15. — Suture-line of the same specimen. 



