PLATE VI. 



Fig. 



1, a, b. Trigonia triquetra, Seebach. Calcareous Grit, Cumnor, Oxfordshire. (Page 26.) 



2, ,, ,, Lower Calcareous Grit, Filey Point, Yorkshire. Specimen 



with fewer and larger tuberculated varices. 



3, 4. „ Phittipsii, Mor. and Lye. Inferior Oolite, Appleby, Lincolnshire. 



(Page 38.) 



5 a. „ imbricata, Sow. Great Oolite, Bath. (Page 33.) 



5 b. „ „ The same specimen magnified. 



6. „ Ramsay i, Wright. Supra-Liassic Sands, Frocester Hill, Gloucester- 



shire. (Page 49.) 



