﻿PLATE XL. 



Jurense-zone (Dumortieria-beds) . 



FigS. 1 9. — DdMORTIERIA STRIATCLO-COSTATA (Quetistedt) , var. a. 



Fig. 1. — Side view of a fine adult example. Penn Wood, near Stroud. My 

 Collection. (Page 243.) 



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



Fig. 3. — Side view of the inner whorls broken out of the specimen depicted in 

 Fig. 7. 



Fig. 4. — Front view of the same, to show the almost uncarinate ventral area, 

 and nearly circular whorls. Compare with Bum. prisca, PI. XXXVII, fig. 10. 



Fig. 5. — Side view of the same specimen with an additional half- whorl. 



Fig. 6. — Front view of the same, showing elliptical aperture. Compare with 

 Bum. Levesquei, PI. XXXVII, fig. 7. 



Fig. 7. — Side view of the same example complete. Penn Wood, near Stroud. 

 My Collection. 



Fig. 8. — Aperture of the same. 



Fig. 9. — Suture-line from another specimen. 



Opalinum-zone (Moorei-beds). 



Figs. 10 — 12. — Dumortieria striatulo-costata (Quenstedt), var. /3. 



Fig. 10. — Side view, showing the greater inclusion. Penn Wood. My Collec- 

 tion (see PI. XXXVII, fig. 16). (Page 243.) 

 Fig. 11. — Front view of the same. 

 Fig. 12. — Suture-line of the same. 



