PLATE 12 



Fig. i. Homotryblium tenuispinosum sp. nov. London Clay ; Enborne (boring depth, 

 53 feet). Complete specimen showing medial rupture. V. 51756(3). X500. 



Fig. 2. Cordosphaeridium divergens (Eisenack). London Clay ; Whitecliff, Isle of 

 Wight. ¥.51750(1). X500. 



Fig. 3. } Litosphaeridium inversibuccinum sp. nov. Holotype, ¥.51744(1). Archaeo- 

 pyle shown. X975. 



Fig. 4. Homotryblium pallidum sp. nov. London Clay; Enborne (boring depth, 53 feet). 

 Epitractal operculum bearing apical and precingular processes. V. 51759(5). x 700. 



Fig. 5. Homotryblium tenuispinosum sp. nov. Holotype, V. 51756(1). X700. 



Fig. 6. Homotryblium pallidum sp. nov. Holotype, V. 51756(1). x8oo. 



Fig. 7. Homotryblium tenuispinosum sp. nov. London Clay (78 feet above base of 

 London Clay) ; Sheppey. Enlargement of part of the epitract to show that it is composed of a 

 number of polygonal plates, each bearing a single intratabular process. V. 51759(4). x 1200. 



