LIST OF PLATES 



FACING PAGB 



PLATE I 24-25 



FIG. 



1. Block of Carboniferous Limestone containing Lithostrotien 



irregulare. Port St. Mary, Isle of Man. 



2. Block of Carboniferous Limestone composed of columnals of 



? Actinocrinus. Castleton, Derbyshire. 



3. Block of Bathonian Limestone composed of Millericrinus. 



Lansdowne, near Bath. 



PLATE II 24-25 



1. Block of Ludlow (Aymestry) Limestone composed of Conchidium 



knighti. Weo Edge, Shropshire. 



2. Nodule of Flint from the Upper Chalk, containing, and derived 



from, Ventriculites. Peppard, Oxon. 



3. Block of Bembridge Limestone (Oligocene), largely composed of 



Limnaea and Planorbis. Bembridge, Isle of Wight. 



PLATE III 38 



1. Trigonia clavellata with the ligament preserved. Corallian, 



Weymouth. 



2. Trigonia incurva. Internal mould. Portlandian, Swindon 



3. Angelina sedgwicki. Distorted by cleavage. Tremadoc slates, 



Minfford, N. Wales. 



4. Gly timer is glycimeris. Pliocene, Suffolk. The aragonite shell 



is crumbling. 



5. Ostrea edulis. Pliocene, Suffolk. The calcite shell is in perfect 



preservation. 



