PLATE V. 



Fig. 



1, a, b. Trigonia irregularis, Seebach. Specimen of adult growth, Oxford Clay, 



Weymouth. (Page 39.) 



2. „ „ Imperfect specimen with the rows of costae more than 



usually numerous and irregular. 



4. ,, Formosa, Lye. Young example, Inferior Oolite, Cold Comfort, near 



Cheltenham. (Page 35.) 



5. „ „ Young example, Rodborough Hill, near Stroud. 



6. ,, „ Specimen of adult growth, Rodborough Hill, near 



Stroud. 



3 and 7. striata, Miller. Adult examples, Inferior Oolite, Bradford Abbas, 



Dorset. (Page 36.) 



8. „ ,, Young example from the same locality. 



9, 10. tuberculosa, Lye. Inferior Oolite, Leckhampton Hill, near Chelten- 



ham. (Page 33.) The perpendicular continuations 

 downwards of the little tubercles are not sufficiently 

 distinct. 



