PLATE X. 



Figs. 



1. Cerithium near to variculosum, Desl. I. 0., Rodborough Hill. Jermyn Street 



Museum. (Page 166.) 



2. Cerithium comma, Miinst. Cadomensis-bed, Oborne. Woodwardian Museum. 



(Page 167.) 



3. Cerithium comma, var. near to C. unitor quotum, H. & D. P p Bridport Har- 



bour. Woodwardian Museum. (Page 168.) 



4. Cerithium circe, D'Orb. I. 0., Dorset. Woodwardian Museum. (Page 168.) 



5. Cerithium " commaoides." Lincolnshire Limestone, Weldon. My collection. 



(Page 169.) 



6. Cerithium pergradatum, sp. nov. Haselbury, ? from the Ojpalinus -zone. My 



collection. (Page 169.) 



7 a. Cerithium " annulatum." Lincolnshire Limestone. Sharp collection, British 



Museum. 7 b. Section of another specimen, same collection. 



8 a. Cerithium clypeus, sp. nov. Clypeus-grit of Rodborough. Witchell collection. 



8 b. Section of another specimen. 8'. Variety from the Parkinsoni- 

 zone of Aston. My collection. (Page 170.) 



9 a. Cerithium attritum, sp. nov. Lincolnshire Limestone, Weldon. My collec- 



tion. 9b. Section of another specimen, same collection. (Page 171.) 

 10 a, 10 b. Cerithium abbas, sp. nov. Sowerbyi-bed, Bradford Abbas. My collec- 

 tion. 10 c. Section of another specimen, same collection. (Page 172.) 



11. Cerithium obomense, sp. nov. Sauzei-bed, Oborne. My collection. (Page 173.) 



12. Cerithium jpolystrophum, sp. nov. Lincolnshire Limestone, Weldon. My col- 



lection. (Page 173.) 



13. Cerithium species or immature form. Lincolnshire Limestone, Weldon. My 



collection. 



