PLATE XXXI. 



Opalinum,-zo7ie (Moorei-beds). 

 Figs. 1 — 4. — Grammoceras maotra {Dumortier). 



Fig. 1. — Side view of a fairly typical example (var. a). Frocester Hill (Coaley 

 Peak). My Collection. (Page 176.) 



Fig. 2. — Suture-line of the same specimen. 



Fig. 3. — Side view of a very well-preserved example (var. /3), showing well- 

 pronounced senile characters. Frocester Hill (Coaley Peak). My Collection. 

 (Page 177.) 



Fig. 4. — Front view of the same, showing the absence of any distinct carina, 

 the ventral area being only slightly and bluntly angular. 



Figs. 5 — 14. — Grammoceras subserrodens (Branco). 



Fig. 5. — Side view of a specimen without test. North Nibley. My Collection. 

 (Page 179.) 



Fig. 6. — Back view, showing the sharp carina. 



Fig. 7. — Side view of an example with part of the inner test preserved. It 

 shows slightly fascicled ribs. North Nibley, Gloucestershire. My Collection. 



Fig. 8. — Aperture of the same in outline. 



Fig. 9. — Suture-line of the same. 



Fig. 10. — Side view of a form with coarser ribs and a rather larger umbilicus. 

 Haresfield Hill. My Collection. 



Fig. 11. — Front view of the same specimen. 



Fig. 12. — Suture-line of the same specimen. 



Fig. 13. — Side view of a specimen with small umbiUcus and very fine ribs. 

 Haresfield Hill, Gloucestershire. My Collection. 



Fig. 14. — Suture-line of the same specimen. These two figs. (13, 14) are given 

 expressly to compare with Lioceras 02)aUnum, Plate XIII, fig. 9, and Plate A, fig. 

 10. See Page 39. 



Figs. 15, 16. — Grammoceras aalense {Zieten). 



Fig. 15. — Side view of a form without test. The faintness of the ribbing is 

 noticeable, and the single ribs in the inner whorls give it an appearance like 

 Gramm. lotharingicum (Branco). Haresfield Hill. My Collection. (Page 192.) 



Fig. 16. — Front view of the same, showing that the specimen is unequal-sided. 



