PLATE XXVIII. 



Variabilis-subzo7ie . 



Figs. 1 — 3. — Haugia jugosa (Soiverby). 



Fig. 1. — Side view of the smooth inner whorls, obtained by breaking up a large 

 specimen. Natural size. My Collection. (Page 149.) 



Fig. 2. — Front view of the same specimen, showing uncarinate ventral area. 

 Fig. 3. — Suture-line of the same specimen slightly enlarged. 



Jurense-zone (Striatulum-beds). 

 Figs. 4 — 13. — Geammooeras toarcense (d'Orbigny). 



Fig. 4. — Side view of a very coarsely-ribbed adult form with the mouth-border 

 preserved. The test is absent from the specimen except on the ventral portion 

 of the mouth. Coaley Wood Gloucestershire. My Collection. (Page 169.) 



Fig. 5. — View of the same specimen from the top to show the ventral lappet 

 of the mouth and also the width and squareness of the ventral area. 



Fig. 6. — The simple suture-line of the same specimen. 



Fig. 7. — Side view of an immature specimen, showing a smooth inner part 

 of whorl. The specimen is without test. North Nibley, Gloucestershire. My 

 Collection. 



Fig. 8. — Front view of the same specimen to show the flatness on each side 

 of the carina, the only indication which the species possesses of the ancestral 

 sulcate ventral area. 



Fig. 9. — The front view of a smaller specimen, showing similar characters. 

 Coaley Wood, Gloucestershire. My Collection. 



Fig. 10. — Side view of the same specimen. The test is partly preserved. 

 These two figures are to compare with figs. 18, 19. 



Fig. 11. — Side view of the smooth inner whorls broken out of a larger 

 specimen. Magnified. 



Fig. 12. — Front view of the same with uncarinate ventral area. The line at 

 the side shows the size of the original specimen. 



Fig. 13. — Simple suture-line of the same. These figures (11 — 13) illustrate 

 what Hyatt calls the Goniatite stage. 



Figs. 14, 15. — Grammocbras toarcense-striatulum, 8. Buckmun. 



Fig. 14. — Side view of a form possessing the coarse ribs of Gramm. toarcense 

 but with a more sharpened carina. Little Sodbury, Gloucestershire. My Collection. 

 (Page 171.) 



Fig. 15. — Section of the whorl in outline. 



Figs. 16 — 21. — Geammooeras striatulum {Sowerby). 



Fig. 16. — Side view of a specimen with small ribs, which reach, though faintly, 

 to the inner edge in places. Stinchcombe Hill. My Collection. (Page 173.) 



Fig. 17.— Section of the whorl in outline. The suture-line of this specimen is 

 depicted in Plate A, fig. 43. 



Fig. 18. — Side view of a smaller specimen without test, showing inconspicuous 

 ribs. Stinchcombe. My Collection. 



Fig. 19. — Back view of the same specimen. 



Fig. 20. — Side view of a young specimen, showing the mouth-border. The 

 lateral auricle is probably not quite complete along its upper edge. The last 

 suture is opposite the line joining the two specimens. From a Sandstone nodule 

 at the very top of the Cotteswold Sands. Buckholt Wood. My Collection. 



Fig. 2l. — View from above to show the ventral process of the mouth. 



