PLATE VIII. 
Fig. 1. Tholopora vinei (Greg.). Cambridge Greensand : Cambridge. 
Part of the surface ; x 15 dia. Jesson Coll. [D. 1881.] 
Fig. 2. Tholopora cantiana (Greg.). Upper Chalk : Bromley. A 
zoarium from the side ; x 5 dia. J. Simmons Coll. 
[D. 2849.] 
Fig. 3. Tholopora cantiana (Greg.). Middle Chalk — Zone of Micraster 
cortestudinarium : Chatham. The type-specimen from the 
side ; x 5 dia. Vine Coll. [D. 2759.] 
Fig. 4. Heteropora suhcequiporosa^ Greg. Upper Greensand ; War- 
minster. Fig. 4a, the zoarium from the side, nat. size ; 
Fig. 46, the upper end of the zoarium, nat. size ; Fig. 4c, 
part of the surface, x 10 dia. J. Brown Coll. [D. 3177.] 
Fig. 5. Heteropora michelini (d’Orb.), var. coalescens. Upper Green- 
sand — Zone of Schloenhachia rostrata : Haldon. Fig. 5a, 
the whole zoarium, nat. size; Fig. 56, part of the surface, 
X 10 dia. Vicary Coll. [D. 7400.] 
