﻿PLATE XXXVII. 



Jurense-zone. 

 Figs. 1 — 5. — Poltplectus discoides {Zieten). 



Fig. 1. — Suture-line of a specimen from White Lackington, Somerset, to show the accessory tuft 

 to the siphonal lobe, the forceps-like endiug (/) to the superior lateral lobe, and the accessory lobe 

 (a a) to the siphonal saddle nearly equal in size to the inferior lateral lobe — the last detail being 

 different from d'Orbigny's delineation. The suture is of natural size, and is copied from a drawing of 

 mine. (Page 219.) 



Fiir. 2. — Side view of a small specimen from Milhau, Aveyron, France. (Page 215.) 



Fig. 3. — Front view of the same specimen to show the view of the chamber-wall with its lobes 

 and saddle-, demonstrating the existence of a well-marked accessory lobe (a a) in the siphonal saddle, 

 a point omitted in d'Orbigny's and Wright's figures. 



Fig. 4. — The terminal branch (much enlarged) of the siphonal lobe when the side of the whorl is 

 3-2 lines broad. 



Fig. 5. — The same when the side is 5| lines broad. The letters a — e indicate the same points in 

 each figure, and show their development. 



Figs. 6 — 8. — Dumortieria Levesquei {cTOrbigny). 



Fig. 6. — Side view of a well-preserved, but not quite typical specimen. From the Yeovil Sands, 

 Yeovil Junction (? Stoford, Somerset). Collected by Mr. Darell Stephens, F.G.S. (see PI. XL\ ) 

 (Page 241.) / 



Fig. 7. — Front view of the same specimen. 



Fig. 8. — Suture-line of the same specimen, showing the deep siphonal and inferior lateral saddles, 

 and the dependent inner portion, — characteristic features of the lobe-line of this genus. 



Figs. 9 — 11. — Dtjmoetieria prisca, S. Buckman. 



Fig. 9.- — Side view of a fairly well-preserved specimen. Yeovil Sands, Hendford Hill, Yeovil, 

 Somerset. Collected by Mr. Darell Stephens, F.Gr.S. (Page 236.) 



Fig. 10. — Front view of the same, showing the almost circular aperture and the very small 

 carina. 



Fig. 11. — Suture-line from the same specimen. 



Figs. 12 — 15. — Dumortieria costula (Reinecke). 



Fig. 12. — Side view of a small example comparable to Eeinecke's figure. Cam Down. My 

 Collection. (Page 237.) 



Fig. 13.- — -Front view of the same. 



Fig. 14. — Side view of a larger specimen without test, except a piece at the top showing fine lines. 

 This is exactly the Dumortieria Munieri, Haug. I purchased it out of the Collection which belonged 

 to the late Dr. Wright. The locality is unrecorded, but the black stony matrix suggests the 

 " Striatulus-sha\es " of Blue Wyke, Yorkshire. 



Fig. 15. — Front view of the same. 



Opalin um-zone (Moorei-beds) . 



FigS. 16, 17. — DUMOIITIERIA STRIATULO-COSTATA (Quetistedt), X&T. 0. 



Fig. 16. — Side Tiew of an example with complete test. Shell-beds of the Yeovil Sands, 

 Stoford, Somerset (labelled Yeovil Junction). Collected by Mr. Darell Stephens, F.G.S. (Page 

 243.) 



Fig. 17. — Front view of the same. 



Figs. 18, 19. — Dumortieria, sp. 



Fig. 18. — Side view of a rather poorly-preserved specimen. Shell-beds of the Yeovil Sands, 

 Stoford, Somerset (labelled Yeovil Junction). Collected by Mr. Darell Stephens, F.G.S. , &c. 

 (Page 245.) 



Fig. 19. — Front view of the same. 



